[PATCH v3 0/8] s390x: Add support for virtio-scsi-pci boot device

[PATCH v3 0/8] s390x: Add support for virtio-scsi-pci boot device

[jrossi]

From: Jared Rossi <jrossi@linux.ibm.com>

Add support for booting from SCSI devices with a virtio-scsi-pci controller.

Some minor clean-up is done with naming in order to clarify if the function
or value used with CCW, PCI, or generic IPL and to check if a PCI function
is already enabled.

Changes v2 -> v3:
    - Rebase on recently added Secure IPL features added to BIOS
    - Define PCI IPLB length using offset and sizeof rather than magic
    - Check for virtio setup failures during scsi setup
    - Fix commit messages
    - Update the title of patch 3 to indicate multiple lengths change

Jared Rossi (8):
  pc-bios/s390-ccw: Check if a PCI function is already enabled before
    trying to enable it
  hw/s390x/ipl: Fix incorrect PCI IPL block lengths
  pc-bios/s390-ccw: Use bus specific IPL_TYPE directly for scsi IPL
  s390x/ipl: Add PCI and bus fields to IplBlockQemuScsi
  pc-bios/s390-ccw: Abstract virtio_run() for generic use
  pc-bios/s390-ccw: Add support for virtio-scsi-pci IPL
  s390x: Find scsi-pci boot device and build IPLB
  tests/qtest: Add s390x PCI SCSI fallback test to cdrom-test.c

 hw/s390x/ipl.c                   | 40 ++++++++++++++++++++++++++++++++
 hw/s390x/ipl.h                   |  2 ++
 include/hw/s390x/ipl/qipl.h      | 15 ++++++++----
 pc-bios/s390-ccw/clp.c           |  4 ++++
 pc-bios/s390-ccw/main.c          | 19 +++++++++++----
 pc-bios/s390-ccw/virtio-blkdev.c |  1 -
 pc-bios/s390-ccw/virtio-ccw.c    | 17 --------------
 pc-bios/s390-ccw/virtio-ccw.h    |  1 -
 pc-bios/s390-ccw/virtio-pci.c    | 31 ++++++++++++++++++++++++-
 pc-bios/s390-ccw/virtio-scsi.c   | 18 +++++++++++++-
 pc-bios/s390-ccw/virtio.c        | 21 +++++++++--------
 tests/qtest/cdrom-test.c         |  8 +++++++
 12 files changed, 137 insertions(+), 40 deletions(-)

-- 
2.54.0

[PATCH v3 1/8] pc-bios/s390-ccw: Check if a PCI function is already enabled before trying to enable it

[jrossi]

From: Jared Rossi <jrossi@linux.ibm.com>

Enabling a PCI function that is already configured will result in an error.
Simply check if the device has already been enabled, and if so, return
without doing anything further; otherwise, enable it as usual.

Also, because enable_pci_function() prints its own message, let's remove
the duplicate message emitted during the virtio PCI setup steps.

Reviewed-by: Zhuoying Cai <zycai@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
---
 pc-bios/s390-ccw/clp.c        | 4 ++++
 pc-bios/s390-ccw/virtio-pci.c | 1 -
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/pc-bios/s390-ccw/clp.c b/pc-bios/s390-ccw/clp.c
index ca9565d8de..7917f13345 100644
--- a/pc-bios/s390-ccw/clp.c
+++ b/pc-bios/s390-ccw/clp.c
@@ -82,6 +82,10 @@ int enable_pci_function(uint32_t *fhandle)
 {
     ClpReqRspSetPci rrb;
 
+    if (*fhandle & CLP_FHLIST_MASK_CONFIG) {
+        return 0;   /* already enabled */
+    }
+
     rrb.request.hdr.len = sizeof(ClpReqSetPci);
     rrb.request.hdr.cmd = 0x05;
     rrb.request.fh = *fhandle;
diff --git a/pc-bios/s390-ccw/virtio-pci.c b/pc-bios/s390-ccw/virtio-pci.c
index f501252c81..231ab6e04d 100644
--- a/pc-bios/s390-ccw/virtio-pci.c
+++ b/pc-bios/s390-ccw/virtio-pci.c
@@ -452,7 +452,6 @@ int virtio_pci_setup_device(void)
     VDev *vdev = virtio_get_device();
 
     if (enable_pci_function(&vdev->pci_fh)) {
-        puts("Failed to enable PCI function");
         return -ENODEV;
     }
 
-- 
2.54.0

Re: [PATCH v3 1/8] pc-bios/s390-ccw: Check if a PCI function is already enabled before trying to enable it

[Jason J. Herne]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> Enabling a PCI function that is already configured will result in an error.
> Simply check if the device has already been enabled, and if so, return
> without doing anything further; otherwise, enable it as usual.
> 
> Also, because enable_pci_function() prints its own message, let's remove
> the duplicate message emitted during the virtio PCI setup steps.
> 
> Reviewed-by: Zhuoying Cai <zycai@linux.ibm.com>
> Reviewed-by: Eric Farman <farman@linux.ibm.com>
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   pc-bios/s390-ccw/clp.c        | 4 ++++
>   pc-bios/s390-ccw/virtio-pci.c | 1 -
>   2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/pc-bios/s390-ccw/clp.c b/pc-bios/s390-ccw/clp.c
> index ca9565d8de..7917f13345 100644
> --- a/pc-bios/s390-ccw/clp.c
> +++ b/pc-bios/s390-ccw/clp.c
> @@ -82,6 +82,10 @@ int enable_pci_function(uint32_t *fhandle)
>   {
>       ClpReqRspSetPci rrb;
>   
> +    if (*fhandle & CLP_FHLIST_MASK_CONFIG) {
> +        return 0;   /* already enabled */
> +    }
> +
>       rrb.request.hdr.len = sizeof(ClpReqSetPci);
>       rrb.request.hdr.cmd = 0x05;
>       rrb.request.fh = *fhandle;
> diff --git a/pc-bios/s390-ccw/virtio-pci.c b/pc-bios/s390-ccw/virtio-pci.c
> index f501252c81..231ab6e04d 100644
> --- a/pc-bios/s390-ccw/virtio-pci.c
> +++ b/pc-bios/s390-ccw/virtio-pci.c
> @@ -452,7 +452,6 @@ int virtio_pci_setup_device(void)
>       VDev *vdev = virtio_get_device();
>   
>       if (enable_pci_function(&vdev->pci_fh)) {
> -        puts("Failed to enable PCI function");
>           return -ENODEV;
>       }
>   

Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>

[PATCH v3 2/8] hw/s390x/ipl: Fix incorrect PCI IPL block lengths

[jrossi]

From: Jared Rossi <jrossi@linux.ibm.com>

The length of the PCI IPLB is calculated by size of the IplBlockPci struct
plus the number of bytes used for common IPLB fields.

Fix the S390_IPLB_MIN_PCI_LEN to reflect this, and assign a valid blk0_len
while we are at it.

Cc: qemu-stable@nongnu.org
Fixes: 395116781df5 ("s390x: Build IPLB for virtio-pci devices")
Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
---
 hw/s390x/ipl.c              | 2 ++
 include/hw/s390x/ipl/qipl.h | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
index d59ed36c78..ba69ee89bb 100644
--- a/hw/s390x/ipl.c
+++ b/hw/s390x/ipl.c
@@ -615,6 +615,8 @@ static bool s390_build_iplb(DeviceState *dev_st, IplParameterBlock *iplb)
         switch (devtype) {
         case PCI_DEVTYPE_VIRTIO:
             iplb->len = cpu_to_be32(S390_IPLB_MIN_PCI_LEN);
+            iplb->blk0_len =
+                cpu_to_be32(S390_IPLB_MIN_PCI_LEN - S390_IPLB_HEADER_LEN);
             iplb->pbt = S390_IPL_TYPE_PCI;
             iplb->pci.fid = cpu_to_be32(pbdev->fid);
             break;
diff --git a/include/hw/s390x/ipl/qipl.h b/include/hw/s390x/ipl/qipl.h
index 3fa9649112..69b0023ea3 100644
--- a/include/hw/s390x/ipl/qipl.h
+++ b/include/hw/s390x/ipl/qipl.h
@@ -39,7 +39,7 @@ typedef enum S390IplType S390IplType;
 #define S390_IPLB_MIN_PV_LEN 148
 #define S390_IPLB_MIN_CCW_LEN 200
 #define S390_IPLB_MIN_FCP_LEN 384
-#define S390_IPLB_MIN_PCI_LEN 376
+#define S390_IPLB_MIN_PCI_LEN (offsetof(IplParameterBlock, pci) + sizeof(IplBlockPci))
 #define S390_IPLB_MIN_QEMU_SCSI_LEN 200
 #define S390_IPLB_MAX_LEN 4096
 
-- 
2.54.0

Re: [PATCH v3 2/8] hw/s390x/ipl: Fix incorrect PCI IPL block lengths

[Eric Farman]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> The length of the PCI IPLB is calculated by size of the IplBlockPci struct
> plus the number of bytes used for common IPLB fields.
> 
> Fix the S390_IPLB_MIN_PCI_LEN to reflect this, and assign a valid blk0_len
> while we are at it.
> 
> Cc: qemu-stable@nongnu.org
> Fixes: 395116781df5 ("s390x: Build IPLB for virtio-pci devices")
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   hw/s390x/ipl.c              | 2 ++
>   include/hw/s390x/ipl/qipl.h | 2 +-
>   2 files changed, 3 insertions(+), 1 deletion(-)

Thanks. The rest of the cleanup will be nice, but for this as a -stable 
candidate:

Reviewed-by: Eric Farman <farman@linux.ibm.com>

Re: [PATCH v3 2/8] hw/s390x/ipl: Fix incorrect PCI IPL block lengths

[Jason J. Herne]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> The length of the PCI IPLB is calculated by size of the IplBlockPci struct
> plus the number of bytes used for common IPLB fields.
> 
> Fix the S390_IPLB_MIN_PCI_LEN to reflect this, and assign a valid blk0_len
> while we are at it.
> 
> Cc: qemu-stable@nongnu.org
> Fixes: 395116781df5 ("s390x: Build IPLB for virtio-pci devices")
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   hw/s390x/ipl.c              | 2 ++
>   include/hw/s390x/ipl/qipl.h | 2 +-
>   2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
> index d59ed36c78..ba69ee89bb 100644
> --- a/hw/s390x/ipl.c
> +++ b/hw/s390x/ipl.c
> @@ -615,6 +615,8 @@ static bool s390_build_iplb(DeviceState *dev_st, IplParameterBlock *iplb)
>           switch (devtype) {
>           case PCI_DEVTYPE_VIRTIO:
>               iplb->len = cpu_to_be32(S390_IPLB_MIN_PCI_LEN);
> +            iplb->blk0_len =
> +                cpu_to_be32(S390_IPLB_MIN_PCI_LEN - S390_IPLB_HEADER_LEN);
>               iplb->pbt = S390_IPL_TYPE_PCI;
>               iplb->pci.fid = cpu_to_be32(pbdev->fid);
>               break;
> diff --git a/include/hw/s390x/ipl/qipl.h b/include/hw/s390x/ipl/qipl.h
> index 3fa9649112..69b0023ea3 100644
> --- a/include/hw/s390x/ipl/qipl.h
> +++ b/include/hw/s390x/ipl/qipl.h
> @@ -39,7 +39,7 @@ typedef enum S390IplType S390IplType;
>   #define S390_IPLB_MIN_PV_LEN 148
>   #define S390_IPLB_MIN_CCW_LEN 200
>   #define S390_IPLB_MIN_FCP_LEN 384
> -#define S390_IPLB_MIN_PCI_LEN 376
> +#define S390_IPLB_MIN_PCI_LEN (offsetof(IplParameterBlock, pci) + sizeof(IplBlockPci))
>   #define S390_IPLB_MIN_QEMU_SCSI_LEN 200
>   #define S390_IPLB_MAX_LEN 4096
>   

Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>

Re: [PATCH v3 2/8] hw/s390x/ipl: Fix incorrect PCI IPL block lengths

[Matthew Rosato]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> The length of the PCI IPLB is calculated by size of the IplBlockPci struct
> plus the number of bytes used for common IPLB fields.
> 
> Fix the S390_IPLB_MIN_PCI_LEN to reflect this, and assign a valid blk0_len
> while we are at it.
> 
> Cc: qemu-stable@nongnu.org
> Fixes: 395116781df5 ("s390x: Build IPLB for virtio-pci devices")
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>  hw/s390x/ipl.c              | 2 ++
>  include/hw/s390x/ipl/qipl.h | 2 +-
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
> index d59ed36c78..ba69ee89bb 100644
> --- a/hw/s390x/ipl.c
> +++ b/hw/s390x/ipl.c
> @@ -615,6 +615,8 @@ static bool s390_build_iplb(DeviceState *dev_st, IplParameterBlock *iplb)
>          switch (devtype) {
>          case PCI_DEVTYPE_VIRTIO:
>              iplb->len = cpu_to_be32(S390_IPLB_MIN_PCI_LEN);
> +            iplb->blk0_len =
> +                cpu_to_be32(S390_IPLB_MIN_PCI_LEN - S390_IPLB_HEADER_LEN);
>              iplb->pbt = S390_IPL_TYPE_PCI;
>              iplb->pci.fid = cpu_to_be32(pbdev->fid);
>              break;
> diff --git a/include/hw/s390x/ipl/qipl.h b/include/hw/s390x/ipl/qipl.h
> index 3fa9649112..69b0023ea3 100644
> --- a/include/hw/s390x/ipl/qipl.h
> +++ b/include/hw/s390x/ipl/qipl.h
> @@ -39,7 +39,7 @@ typedef enum S390IplType S390IplType;
>  #define S390_IPLB_MIN_PV_LEN 148
>  #define S390_IPLB_MIN_CCW_LEN 200
>  #define S390_IPLB_MIN_FCP_LEN 384
> -#define S390_IPLB_MIN_PCI_LEN 376
> +#define S390_IPLB_MIN_PCI_LEN (offsetof(IplParameterBlock, pci) + sizeof(IplBlockPci))

Thanks!

Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>

>  #define S390_IPLB_MIN_QEMU_SCSI_LEN 200
>  #define S390_IPLB_MAX_LEN 4096
>  

[PATCH v3 3/8] pc-bios/s390-ccw: Use bus specific IPL_TYPE directly for scsi IPL

[jrossi]

From: Jared Rossi <jrossi@linux.ibm.com>

All existing switch cases that handle S390_IPL_TYPE_QEMU_SCSI directly fall
through to S390_IPL_TYPE_CCW.  Rather than always fall through, reassign
vdev->ipl_type to the appropriate bus for the scsi controller and proceed
as usual, where the bus is designated by the "bus" field and set during
the IPLB build.

Because S390_IPL_TYPE_QEMU_SCSI should not appear as an ipl_type once the
device is found, remove that specific case from other existing switches
and allow it to land in the default case, which will generally result
in an immediate error.

Reviewed-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
---
 pc-bios/s390-ccw/main.c          | 13 ++++++++++---
 pc-bios/s390-ccw/virtio-blkdev.c |  1 -
 pc-bios/s390-ccw/virtio.c        |  5 -----
 3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 8fc1cbf653..6ab2b8f75b 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -261,8 +261,16 @@ static bool find_boot_device(void)
         vdev->selected_scsi_device.channel = iplb->scsi.channel;
         vdev->selected_scsi_device.target = iplb->scsi.target;
         vdev->selected_scsi_device.lun = iplb->scsi.lun;
-        blk_schid.ssid = iplb->scsi.ssid & 0x3;
-        found = find_subch(iplb->scsi.devno);
+        vdev->ipl_type = iplb->scsi.bus;
+        switch (vdev->ipl_type) {
+        case S390_IPL_TYPE_CCW:
+            blk_schid.ssid = iplb->scsi.ssid & 0x3;
+            found = find_subch(iplb->scsi.devno);
+            break;
+        default:
+            puts("Unrecognized SCSI controller");
+            break;
+        }
         break;
      case S390_IPL_TYPE_PCI:
         found = find_fid(iplb->pci.fid);
@@ -346,7 +354,6 @@ static void ipl_pci_device(void)
 static void ipl_boot_device(void)
 {
     switch (virtio_get_device()->ipl_type) {
-    case S390_IPL_TYPE_QEMU_SCSI:
     case S390_IPL_TYPE_CCW:
         ipl_ccw_device();
         break;
diff --git a/pc-bios/s390-ccw/virtio-blkdev.c b/pc-bios/s390-ccw/virtio-blkdev.c
index 98b6cec3a0..83a1185dd5 100644
--- a/pc-bios/s390-ccw/virtio-blkdev.c
+++ b/pc-bios/s390-ccw/virtio-blkdev.c
@@ -253,7 +253,6 @@ int virtio_blk_setup_device(VDev *vdev)
     puts("Using virtio-blk.");
 
     switch (vdev->ipl_type) {
-    case S390_IPL_TYPE_QEMU_SCSI:
     case S390_IPL_TYPE_CCW:
         return virtio_ccw_setup(vdev);
     case S390_IPL_TYPE_PCI:
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index a0d249db24..0b33544144 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -61,7 +61,6 @@ char *virtio_get_ring_area(int ring_num)
 int drain_irqs(void)
 {
     switch (vdev.ipl_type) {
-    case S390_IPL_TYPE_QEMU_SCSI:
     case S390_IPL_TYPE_CCW:
         return drain_irqs_ccw(vdev.schid);
     default:
@@ -109,7 +108,6 @@ void vring_init(VRing *vr, VqInfo *info)
 bool vring_notify(VRing *vr)
 {
     switch (vdev.ipl_type) {
-    case S390_IPL_TYPE_QEMU_SCSI:
     case S390_IPL_TYPE_CCW:
         vr->cookie = virtio_ccw_notify(vdev.schid, vr->id, vr->cookie);
         break;
@@ -130,7 +128,6 @@ bool vring_notify(VRing *vr)
 bool be_ipl(void)
 {
     switch (virtio_get_device()->ipl_type) {
-    case S390_IPL_TYPE_QEMU_SCSI:
     case S390_IPL_TYPE_CCW:
         return true;
     case S390_IPL_TYPE_PCI:
@@ -231,7 +228,6 @@ int vring_wait_reply(void)
 int virtio_reset(VDev *vdev)
 {
     switch (vdev->ipl_type) {
-    case S390_IPL_TYPE_QEMU_SCSI:
     case S390_IPL_TYPE_CCW:
         return virtio_ccw_reset(vdev);
     case S390_IPL_TYPE_PCI:
@@ -244,7 +240,6 @@ int virtio_reset(VDev *vdev)
 bool virtio_is_supported(VDev *vdev)
 {
     switch (vdev->ipl_type) {
-    case S390_IPL_TYPE_QEMU_SCSI:
     case S390_IPL_TYPE_CCW:
         return virtio_ccw_is_supported(vdev);
     case S390_IPL_TYPE_PCI:
-- 
2.54.0

Re: [PATCH v3 3/8] pc-bios/s390-ccw: Use bus specific IPL_TYPE directly for scsi IPL

[Jason J. Herne]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> All existing switch cases that handle S390_IPL_TYPE_QEMU_SCSI directly fall
> through to S390_IPL_TYPE_CCW.  Rather than always fall through, reassign
> vdev->ipl_type to the appropriate bus for the scsi controller and proceed
> as usual, where the bus is designated by the "bus" field and set during
> the IPLB build.
> 
> Because S390_IPL_TYPE_QEMU_SCSI should not appear as an ipl_type once the
> device is found, remove that specific case from other existing switches
> and allow it to land in the default case, which will generally result
> in an immediate error.
> 
> Reviewed-by: Eric Farman <farman@linux.ibm.com>
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   pc-bios/s390-ccw/main.c          | 13 ++++++++++---
>   pc-bios/s390-ccw/virtio-blkdev.c |  1 -
>   pc-bios/s390-ccw/virtio.c        |  5 -----
>   3 files changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
> index 8fc1cbf653..6ab2b8f75b 100644
> --- a/pc-bios/s390-ccw/main.c
> +++ b/pc-bios/s390-ccw/main.c
> @@ -261,8 +261,16 @@ static bool find_boot_device(void)
>           vdev->selected_scsi_device.channel = iplb->scsi.channel;
>           vdev->selected_scsi_device.target = iplb->scsi.target;
>           vdev->selected_scsi_device.lun = iplb->scsi.lun;
> -        blk_schid.ssid = iplb->scsi.ssid & 0x3;
> -        found = find_subch(iplb->scsi.devno);
> +        vdev->ipl_type = iplb->scsi.bus;
> +        switch (vdev->ipl_type) {
> +        case S390_IPL_TYPE_CCW:
> +            blk_schid.ssid = iplb->scsi.ssid & 0x3;
> +            found = find_subch(iplb->scsi.devno);
> +            break;
> +        default:
> +            puts("Unrecognized SCSI controller");
> +            break;
> +        }
>           break;
>        case S390_IPL_TYPE_PCI:
>           found = find_fid(iplb->pci.fid);
> @@ -346,7 +354,6 @@ static void ipl_pci_device(void)
>   static void ipl_boot_device(void)
>   {
>       switch (virtio_get_device()->ipl_type) {
> -    case S390_IPL_TYPE_QEMU_SCSI:
>       case S390_IPL_TYPE_CCW:
>           ipl_ccw_device();
>           break;
> diff --git a/pc-bios/s390-ccw/virtio-blkdev.c b/pc-bios/s390-ccw/virtio-blkdev.c
> index 98b6cec3a0..83a1185dd5 100644
> --- a/pc-bios/s390-ccw/virtio-blkdev.c
> +++ b/pc-bios/s390-ccw/virtio-blkdev.c
> @@ -253,7 +253,6 @@ int virtio_blk_setup_device(VDev *vdev)
>       puts("Using virtio-blk.");
>   
>       switch (vdev->ipl_type) {
> -    case S390_IPL_TYPE_QEMU_SCSI:
>       case S390_IPL_TYPE_CCW:
>           return virtio_ccw_setup(vdev);
>       case S390_IPL_TYPE_PCI:
> diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
> index a0d249db24..0b33544144 100644
> --- a/pc-bios/s390-ccw/virtio.c
> +++ b/pc-bios/s390-ccw/virtio.c
> @@ -61,7 +61,6 @@ char *virtio_get_ring_area(int ring_num)
>   int drain_irqs(void)
>   {
>       switch (vdev.ipl_type) {
> -    case S390_IPL_TYPE_QEMU_SCSI:
>       case S390_IPL_TYPE_CCW:
>           return drain_irqs_ccw(vdev.schid);
>       default:
> @@ -109,7 +108,6 @@ void vring_init(VRing *vr, VqInfo *info)
>   bool vring_notify(VRing *vr)
>   {
>       switch (vdev.ipl_type) {
> -    case S390_IPL_TYPE_QEMU_SCSI:
>       case S390_IPL_TYPE_CCW:
>           vr->cookie = virtio_ccw_notify(vdev.schid, vr->id, vr->cookie);
>           break;
> @@ -130,7 +128,6 @@ bool vring_notify(VRing *vr)
>   bool be_ipl(void)
>   {
>       switch (virtio_get_device()->ipl_type) {
> -    case S390_IPL_TYPE_QEMU_SCSI:
>       case S390_IPL_TYPE_CCW:
>           return true;
>       case S390_IPL_TYPE_PCI:
> @@ -231,7 +228,6 @@ int vring_wait_reply(void)
>   int virtio_reset(VDev *vdev)
>   {
>       switch (vdev->ipl_type) {
> -    case S390_IPL_TYPE_QEMU_SCSI:
>       case S390_IPL_TYPE_CCW:
>           return virtio_ccw_reset(vdev);
>       case S390_IPL_TYPE_PCI:
> @@ -244,7 +240,6 @@ int virtio_reset(VDev *vdev)
>   bool virtio_is_supported(VDev *vdev)
>   {
>       switch (vdev->ipl_type) {
> -    case S390_IPL_TYPE_QEMU_SCSI:
>       case S390_IPL_TYPE_CCW:
>           return virtio_ccw_is_supported(vdev);
>       case S390_IPL_TYPE_PCI:

Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>

[PATCH v3 4/8] s390x/ipl: Add PCI and bus fields to IplBlockQemuScsi

[jrossi]

From: Jared Rossi <jrossi@linux.ibm.com>

Rather than add a second non-architected IPLB type for scsi-pci devices,
let's add the relevant fields to the existing struct so that it can handle
both PCI and CCW scsi controllers.

The PCI and CCW fields of the IplBlockQemuScsi are aligned with same
offsets as the corresponding fields in IplBlockPci and IplBlockCcw for
potential union access.

Add comments for PCI/CCW specifics and also denote that the S390IplType
enum values must fit in uint8_t.

Reviewed-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
---
 hw/s390x/ipl.c              |  1 +
 hw/s390x/ipl.h              |  2 ++
 include/hw/s390x/ipl/qipl.h | 13 +++++++++----
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
index ba69ee89bb..6969e11b27 100644
--- a/hw/s390x/ipl.c
+++ b/hw/s390x/ipl.c
@@ -563,6 +563,7 @@ static bool s390_build_iplb(DeviceState *dev_st, IplParameterBlock *iplb)
             iplb->scsi.lun = cpu_to_be32(sd->lun);
             iplb->scsi.target = cpu_to_be16(sd->id);
             iplb->scsi.channel = cpu_to_be16(sd->channel);
+            iplb->scsi.bus = S390_IPL_TYPE_CCW;
             iplb->scsi.devno = cpu_to_be16(ccw_dev->sch->devno);
             iplb->scsi.ssid = ccw_dev->sch->ssid & 3;
             break;
diff --git a/hw/s390x/ipl.h b/hw/s390x/ipl.h
index 772566bb11..580f42aa4a 100644
--- a/hw/s390x/ipl.h
+++ b/hw/s390x/ipl.h
@@ -86,6 +86,8 @@ struct S390IPLState {
     uint16_t devno;
 };
 QEMU_BUILD_BUG_MSG(offsetof(S390IPLState, iplb) & 3, "alignment of iplb wrong");
+QEMU_BUILD_BUG_MSG(offsetof(IplBlockQemuScsi, fid) != offsetof(IplBlockPci, fid),
+                   "iplb fields misaligned across bus types");
 
 static inline bool iplb_valid_len(IplParameterBlock *iplb)
 {
diff --git a/include/hw/s390x/ipl/qipl.h b/include/hw/s390x/ipl/qipl.h
index 69b0023ea3..e733c6ce31 100644
--- a/include/hw/s390x/ipl/qipl.h
+++ b/include/hw/s390x/ipl/qipl.h
@@ -29,7 +29,7 @@ enum S390IplType {
     S390_IPL_TYPE_CCW = 0x02,
     S390_IPL_TYPE_PCI = 0x04,
     S390_IPL_TYPE_PV = 0x05,
-    S390_IPL_TYPE_QEMU_SCSI = 0xff
+    S390_IPL_TYPE_QEMU_SCSI = 0xff /* Max value, must fit in uint8_t */
 };
 typedef enum S390IplType S390IplType;
 
@@ -123,9 +123,14 @@ struct IplBlockQemuScsi {
     uint32_t lun;
     uint16_t target;
     uint16_t channel;
-    uint8_t  reserved0[77];
-    uint8_t  ssid;
-    uint16_t devno;
+    uint8_t  bus;
+    uint8_t  reserved0[76];
+    uint8_t  ssid;              /* CCW only */
+    uint16_t devno;             /* CCW only */
+    uint8_t  reserved1[216];
+    uint8_t  opt;               /* PCI only */
+    uint8_t  reserved2[3];
+    uint32_t fid;               /* PCI only */
 } QEMU_PACKED;
 typedef struct IplBlockQemuScsi IplBlockQemuScsi;
 
-- 
2.54.0

Re: [PATCH v3 4/8] s390x/ipl: Add PCI and bus fields to IplBlockQemuScsi

[Jason J. Herne]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> Rather than add a second non-architected IPLB type for scsi-pci devices,
> let's add the relevant fields to the existing struct so that it can handle
> both PCI and CCW scsi controllers.
> 
> The PCI and CCW fields of the IplBlockQemuScsi are aligned with same
> offsets as the corresponding fields in IplBlockPci and IplBlockCcw for
> potential union access.
> 
> Add comments for PCI/CCW specifics and also denote that the S390IplType
> enum values must fit in uint8_t.
> 
> Reviewed-by: Eric Farman <farman@linux.ibm.com>
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   hw/s390x/ipl.c              |  1 +
>   hw/s390x/ipl.h              |  2 ++
>   include/hw/s390x/ipl/qipl.h | 13 +++++++++----
>   3 files changed, 12 insertions(+), 4 deletions(-)
> 
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>

[PATCH v3 5/8] pc-bios/s390-ccw: Abstract virtio_run() for generic use

[jrossi]

From: Jared Rossi <jrossi@linux.ibm.com>

The existing virtio_ccw_run() actually has no dependency on CCW.  Rather
than add a case for non-ccw devices, we can just put the main logic right in
the virtio_run() call so that it can be used for other bus types directly.

Reviewed-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
---
 pc-bios/s390-ccw/virtio-ccw.c | 17 -----------------
 pc-bios/s390-ccw/virtio-ccw.h |  1 -
 pc-bios/s390-ccw/virtio.c     | 16 +++++++++++-----
 3 files changed, 11 insertions(+), 23 deletions(-)

diff --git a/pc-bios/s390-ccw/virtio-ccw.c b/pc-bios/s390-ccw/virtio-ccw.c
index 5cb2158ed2..ea5dbc2857 100644
--- a/pc-bios/s390-ccw/virtio-ccw.c
+++ b/pc-bios/s390-ccw/virtio-ccw.c
@@ -107,23 +107,6 @@ long virtio_ccw_notify(SubChannelId schid, int vq_idx, long cookie)
                          vq_idx, cookie);
 }
 
-int virtio_ccw_run(VDev *vdev, int vqid, VirtioCmd *cmd)
-{
-    VRing *vr = &vdev->vrings[vqid];
-    int i = 0;
-
-    do {
-        vring_send_buf(vr, cmd[i].data, cmd[i].size,
-                       cmd[i].flags | (i ? VRING_HIDDEN_IS_CHAIN : 0));
-    } while (cmd[i++].flags & VRING_DESC_F_NEXT);
-
-    vring_wait_reply();
-    if (drain_irqs()) {
-        return -1;
-    }
-    return 0;
-}
-
 int virtio_ccw_reset(VDev *vdev)
 {
     return run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0, false);
diff --git a/pc-bios/s390-ccw/virtio-ccw.h b/pc-bios/s390-ccw/virtio-ccw.h
index a506767eaa..43d21906e5 100644
--- a/pc-bios/s390-ccw/virtio-ccw.h
+++ b/pc-bios/s390-ccw/virtio-ccw.h
@@ -16,7 +16,6 @@ extern SubChannelId blk_schid;
 /* virtio-ccw.c */
 int drain_irqs_ccw(SubChannelId schid);
 bool virtio_ccw_is_supported(VDev *vdev);
-int virtio_ccw_run(VDev *vdev, int vqid, VirtioCmd *cmd);
 long virtio_ccw_notify(SubChannelId schid, int vq_idx, long cookie);
 int virtio_ccw_setup(VDev *vdev);
 int virtio_ccw_reset(VDev *vdev);
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 0b33544144..34c5e6ee22 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -70,13 +70,19 @@ int drain_irqs(void)
 
 int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd)
 {
-    switch (vdev->ipl_type) {
-    case S390_IPL_TYPE_QEMU_SCSI:
-    case S390_IPL_TYPE_CCW:
-        return virtio_ccw_run(vdev, vqid, cmd);
-    default:
+    VRing *vr = &vdev->vrings[vqid];
+    int i = 0;
+
+    do {
+        vring_send_buf(vr, cmd[i].data, cmd[i].size,
+                       cmd[i].flags | (i ? VRING_HIDDEN_IS_CHAIN : 0));
+    } while (cmd[i++].flags & VRING_DESC_F_NEXT);
+
+    vring_wait_reply();
+    if (drain_irqs()) {
         return -1;
     }
+    return 0;
 }
 
 void vring_init(VRing *vr, VqInfo *info)
-- 
2.54.0

Re: [PATCH v3 5/8] pc-bios/s390-ccw: Abstract virtio_run() for generic use

[Jason J. Herne]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> The existing virtio_ccw_run() actually has no dependency on CCW.  Rather
> than add a case for non-ccw devices, we can just put the main logic right in
> the virtio_run() call so that it can be used for other bus types directly.
> 
> Reviewed-by: Eric Farman <farman@linux.ibm.com>
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   pc-bios/s390-ccw/virtio-ccw.c | 17 -----------------
>   pc-bios/s390-ccw/virtio-ccw.h |  1 -
>   pc-bios/s390-ccw/virtio.c     | 16 +++++++++++-----
>   3 files changed, 11 insertions(+), 23 deletions(-)
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>

[PATCH v3 6/8] pc-bios/s390-ccw: Add support for virtio-scsi-pci IPL

[jrossi]

From: Jared Rossi <jrossi@linux.ibm.com>

Read virtio-pci configuration and configure virt-queue for scsi devices.

Also add check for virtio setup failures when doing scsi setup and return
early if it fails instead of waiting for subsequent failure.

Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
---
 pc-bios/s390-ccw/main.c        |  3 ++-
 pc-bios/s390-ccw/virtio-pci.c  | 30 ++++++++++++++++++++++++++++++
 pc-bios/s390-ccw/virtio-scsi.c | 18 +++++++++++++++++-
 3 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 6ab2b8f75b..a2a24b024f 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -273,6 +273,7 @@ static bool find_boot_device(void)
         }
         break;
      case S390_IPL_TYPE_PCI:
+        vdev->scsi_device_selected = false;
         found = find_fid(iplb->pci.fid);
         break;
     default:
@@ -333,13 +334,13 @@ static void ipl_pci_device(void)
 {
     VDev *vdev = virtio_get_device();
     vdev->is_cdrom = false;
-    vdev->scsi_device_selected = false;
 
     if (virtio_pci_setup_device()) {
         return;
     }
 
     switch (vdev->dev_type) {
+    case VIRTIO_ID_SCSI:
     case VIRTIO_ID_BLOCK:
         if (virtio_setup() == 0) {
             zipl_load(); /* only return on error */
diff --git a/pc-bios/s390-ccw/virtio-pci.c b/pc-bios/s390-ccw/virtio-pci.c
index 231ab6e04d..277c3ea68d 100644
--- a/pc-bios/s390-ccw/virtio-pci.c
+++ b/pc-bios/s390-ccw/virtio-pci.c
@@ -52,6 +52,10 @@ void virtio_pci_id2type(VDev *vdev, uint16_t device_id)
     case 0x1001:
         vdev->dev_type = VIRTIO_ID_BLOCK;
         break;
+    case 0x1048:
+    case 0x1004:
+        vdev->dev_type = VIRTIO_ID_SCSI;
+        break;
     default:
         vdev->dev_type = 0;
     }
@@ -199,6 +203,26 @@ static int virtio_pci_get_blk_config(void)
     return rc;
 }
 
+static int virtio_pci_get_scsi_config(void)
+{
+    VirtioScsiConfig *cfg = &virtio_get_device()->config.scsi;
+    int rc = vpci_read_flex(d_cap.off, d_cap.bar, cfg, sizeof(VirtioScsiConfig));
+
+    /* all fields of scsi config must be byte swapped */
+    cfg->num_queues = bswap32(cfg->num_queues);
+    cfg->seg_max = bswap32(cfg->seg_max);
+    cfg->max_sectors = bswap32(cfg->max_sectors);
+    cfg->cmd_per_lun = bswap32(cfg->cmd_per_lun);
+    cfg->event_info_size = bswap32(cfg->event_info_size);
+    cfg->sense_size = bswap32(cfg->sense_size);
+    cfg->cdb_size = bswap32(cfg->cdb_size);
+    cfg->max_channel = bswap16(cfg->max_channel);
+    cfg->max_target = bswap16(cfg->max_target);
+    cfg->max_lun = bswap32(cfg->max_lun);
+
+    return rc;
+}
+
 static int virtio_pci_negotiate(void)
 {
     int i, rc;
@@ -330,6 +354,7 @@ bool virtio_pci_is_supported(VDev *vdev)
     if (vdev->vendor_id == PCI_VENDOR_VIRTIO) {
         switch (vdev->dev_type) {
         case VIRTIO_ID_BLOCK:
+        case VIRTIO_ID_SCSI:
             return true;
         default:
             return false;
@@ -384,6 +409,11 @@ int virtio_pci_setup(VDev *vdev)
         vdev->cmd_vr_idx = 0;
         virtio_pci_get_blk_config();
         break;
+    case VIRTIO_ID_SCSI:
+        vdev->nr_vqs = 3;
+        vdev->cmd_vr_idx = 2;
+        virtio_pci_get_scsi_config();
+        break;
     default:
         puts("Unsupported virtio device");
         return -ENODEV;
diff --git a/pc-bios/s390-ccw/virtio-scsi.c b/pc-bios/s390-ccw/virtio-scsi.c
index 9ea00c6fe6..ca02ff5989 100644
--- a/pc-bios/s390-ccw/virtio-scsi.c
+++ b/pc-bios/s390-ccw/virtio-scsi.c
@@ -16,6 +16,7 @@
 #include "scsi.h"
 #include "virtio-scsi.h"
 #include "virtio-ccw.h"
+#include "virtio-pci.h"
 #include "s390-time.h"
 #include "helper.h"
 
@@ -479,7 +480,22 @@ static int virtio_scsi_setup(VDev *vdev)
 
 int virtio_scsi_setup_device(VDev *vdev)
 {
-    virtio_ccw_setup(vdev);
+    switch (vdev->ipl_type) {
+    case S390_IPL_TYPE_CCW:
+        if (virtio_ccw_setup(vdev)) {
+            puts("Setup failed for virtio-scsi-ccw");
+            return 1;
+        }
+        break;
+    case S390_IPL_TYPE_PCI:
+        if (virtio_pci_setup(vdev)) {
+            puts("Setup failed for virtio-scsi-pci");
+            return 1;
+        }
+        break;
+    default:
+        return 1;
+    }
 
     if (vdev->config.scsi.sense_size != VIRTIO_SCSI_SENSE_SIZE) {
         puts("Config: sense size mismatch");
-- 
2.54.0

Re: [PATCH v3 6/8] pc-bios/s390-ccw: Add support for virtio-scsi-pci IPL

[Eric Farman]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> Read virtio-pci configuration and configure virt-queue for scsi devices.
> 
> Also add check for virtio setup failures when doing scsi setup and return
> early if it fails instead of waiting for subsequent failure.
> 
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   pc-bios/s390-ccw/main.c        |  3 ++-
>   pc-bios/s390-ccw/virtio-pci.c  | 30 ++++++++++++++++++++++++++++++
>   pc-bios/s390-ccw/virtio-scsi.c | 18 +++++++++++++++++-
>   3 files changed, 49 insertions(+), 2 deletions(-)

Thanks for fixing up the (lack of) return code check.

Reviewed-by: Eric Farman <farman@linux.ibm.com>

Re: [PATCH v3 6/8] pc-bios/s390-ccw: Add support for virtio-scsi-pci IPL

[Jason J. Herne]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> Read virtio-pci configuration and configure virt-queue for scsi devices.
> 
> Also add check for virtio setup failures when doing scsi setup and return
> early if it fails instead of waiting for subsequent failure.
> 
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   pc-bios/s390-ccw/main.c        |  3 ++-
>   pc-bios/s390-ccw/virtio-pci.c  | 30 ++++++++++++++++++++++++++++++
>   pc-bios/s390-ccw/virtio-scsi.c | 18 +++++++++++++++++-
>   3 files changed, 49 insertions(+), 2 deletions(-)
> 
> diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
> index 6ab2b8f75b..a2a24b024f 100644
> --- a/pc-bios/s390-ccw/main.c
> +++ b/pc-bios/s390-ccw/main.c
> @@ -273,6 +273,7 @@ static bool find_boot_device(void)
>           }
>           break;
>        case S390_IPL_TYPE_PCI:
> +        vdev->scsi_device_selected = false;
>           found = find_fid(iplb->pci.fid);
>           break;
>       default:
> @@ -333,13 +334,13 @@ static void ipl_pci_device(void)
>   {
>       VDev *vdev = virtio_get_device();
>       vdev->is_cdrom = false;
> -    vdev->scsi_device_selected = false;
>   
>       if (virtio_pci_setup_device()) {
>           return;
>       }
>   
>       switch (vdev->dev_type) {
> +    case VIRTIO_ID_SCSI:
>       case VIRTIO_ID_BLOCK:
>           if (virtio_setup() == 0) {
>               zipl_load(); /* only return on error */
> diff --git a/pc-bios/s390-ccw/virtio-pci.c b/pc-bios/s390-ccw/virtio-pci.c
> index 231ab6e04d..277c3ea68d 100644
> --- a/pc-bios/s390-ccw/virtio-pci.c
> +++ b/pc-bios/s390-ccw/virtio-pci.c
> @@ -52,6 +52,10 @@ void virtio_pci_id2type(VDev *vdev, uint16_t device_id)
>       case 0x1001:
>           vdev->dev_type = VIRTIO_ID_BLOCK;
>           break;
> +    case 0x1048:
> +    case 0x1004:
> +        vdev->dev_type = VIRTIO_ID_SCSI;
> +        break;
>       default:
>           vdev->dev_type = 0;
>       }

I normally dislike magic numbers, but the meaning here is clear enough, 
and the comment above the function is a good enough pointer to the 
source of the magic, in my opinion:

/* virtio spec v1.3 section 4.1.2.1 */
void virtio_pci_id2type(VDev *vdev, uint16_t device_id)

So lgtm :)

Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>

[PATCH v3 7/8] s390x: Find scsi-pci boot device and build IPLB

[jrossi]

From: Jared Rossi <jrossi@linux.ibm.com>

Add logic to identify a virtio-pci scsi controller and target lun with
assigned bootindex, then build IPLB for it.

Unfence PCI case for scsi devices in BIOS.

Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
---
 hw/s390x/ipl.c          | 37 +++++++++++++++++++++++++++++++++++++
 pc-bios/s390-ccw/main.c |  3 +++
 2 files changed, 40 insertions(+)

diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
index 6969e11b27..0cab043b12 100644
--- a/hw/s390x/ipl.c
+++ b/hw/s390x/ipl.c
@@ -402,6 +402,7 @@ static CcwDevice *s390_get_ccw_device(DeviceState *dev_st, int *devtype)
 }
 
 #define PCI_DEVTYPE_VIRTIO       0x05
+#define PCI_DEVTYPE_SCSI         0x06
 
 static S390PCIBusDevice *s390_get_pci_device(DeviceState *dev_st, int *devtype)
 {
@@ -417,6 +418,26 @@ static S390PCIBusDevice *s390_get_pci_device(DeviceState *dev_st, int *devtype)
             if (pbdev) {
                 tmp_dt = PCI_DEVTYPE_VIRTIO;
             }
+        } else {
+            SCSIDevice *sd = (SCSIDevice *)
+                object_dynamic_cast(OBJECT(dev_st), TYPE_SCSI_DEVICE);
+            if (sd) {
+                SCSIBus *sbus = scsi_bus_from_device(sd);
+                VirtIODevice *vdev = (VirtIODevice *)
+                    object_dynamic_cast(OBJECT(sbus->qbus.parent),
+                                                TYPE_VIRTIO_DEVICE);
+                if (vdev) {
+                    pci_dev = (PCIDevice *)
+                        object_dynamic_cast(OBJECT(qdev_get_parent_bus(DEVICE(vdev))->parent),
+                                            TYPE_PCI_DEVICE);
+                    if (pci_dev) {
+                        pbdev = s390_pci_find_dev_by_pci(s390_get_phb(), pci_dev);
+                        if (pbdev) {
+                            tmp_dt = PCI_DEVTYPE_SCSI;
+                        }
+                    }
+                }
+            }
         }
     }
     if (devtype) {
@@ -621,6 +642,22 @@ static bool s390_build_iplb(DeviceState *dev_st, IplParameterBlock *iplb)
             iplb->pbt = S390_IPL_TYPE_PCI;
             iplb->pci.fid = cpu_to_be32(pbdev->fid);
             break;
+        case PCI_DEVTYPE_SCSI:
+            sd = SCSI_DEVICE(dev_st);
+            scsi_lp = object_property_get_str(OBJECT(sd), "loadparm", NULL);
+            if (scsi_lp && strlen(scsi_lp) > 0) {
+                lp = scsi_lp;
+            }
+            iplb->len = cpu_to_be32(S390_IPLB_MIN_PCI_LEN);
+            iplb->blk0_len =
+                cpu_to_be32(S390_IPLB_MIN_PCI_LEN - S390_IPLB_HEADER_LEN);
+            iplb->pbt = S390_IPL_TYPE_QEMU_SCSI;
+            iplb->scsi.lun = cpu_to_be32(sd->lun);
+            iplb->scsi.target = cpu_to_be16(sd->id);
+            iplb->scsi.channel = cpu_to_be16(sd->channel);
+            iplb->scsi.bus = S390_IPL_TYPE_PCI;
+            iplb->scsi.fid = cpu_to_be32(pbdev->fid);
+            break;
         default:
             return false;
         }
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index a2a24b024f..d2a2ac3138 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -267,6 +267,9 @@ static bool find_boot_device(void)
             blk_schid.ssid = iplb->scsi.ssid & 0x3;
             found = find_subch(iplb->scsi.devno);
             break;
+        case S390_IPL_TYPE_PCI:
+            found = find_fid(iplb->scsi.fid);
+            break;
         default:
             puts("Unrecognized SCSI controller");
             break;
-- 
2.54.0

Re: [PATCH v3 7/8] s390x: Find scsi-pci boot device and build IPLB

[Joshua Daley]

On 8/31/2026 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> Add logic to identify a virtio-pci scsi controller and target lun with
> assigned bootindex, then build IPLB for it.
> 
> Unfence PCI case for scsi devices in BIOS.
> 
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   hw/s390x/ipl.c          | 37 +++++++++++++++++++++++++++++++++++++
>   pc-bios/s390-ccw/main.c |  3 +++
>   2 files changed, 40 insertions(+)
> 
> diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
> index 6969e11b27..0cab043b12 100644
> --- a/hw/s390x/ipl.c
> +++ b/hw/s390x/ipl.c
> @@ -402,6 +402,7 @@ static CcwDevice *s390_get_ccw_device(DeviceState *dev_st, int *devtype)
>   }
>   
>   #define PCI_DEVTYPE_VIRTIO       0x05
> +#define PCI_DEVTYPE_SCSI         0x06
>   
>   static S390PCIBusDevice *s390_get_pci_device(DeviceState *dev_st, int *devtype)
>   {
> @@ -417,6 +418,26 @@ static S390PCIBusDevice *s390_get_pci_device(DeviceState *dev_st, int *devtype)
>               if (pbdev) {
>                   tmp_dt = PCI_DEVTYPE_VIRTIO;
>               }
> +        } else {
> +            SCSIDevice *sd = (SCSIDevice *)
> +                object_dynamic_cast(OBJECT(dev_st), TYPE_SCSI_DEVICE);
> +            if (sd) {
> +                SCSIBus *sbus = scsi_bus_from_device(sd);
> +                VirtIODevice *vdev = (VirtIODevice *)
> +                    object_dynamic_cast(OBJECT(sbus->qbus.parent),
> +                                                TYPE_VIRTIO_DEVICE);
Small nit: indentation is not quite right here.
TYPE_VIRTIO_DEVICE should align with OBJECT in the line above.

> +                if (vdev) {
> +                    pci_dev = (PCIDevice *)
> +                        object_dynamic_cast(OBJECT(qdev_get_parent_bus(DEVICE(vdev))->parent),
> +                                            TYPE_PCI_DEVICE);
> +                    if (pci_dev) {
> +                        pbdev = s390_pci_find_dev_by_pci(s390_get_phb(), pci_dev);
> +                        if (pbdev) {
> +                            tmp_dt = PCI_DEVTYPE_SCSI;
> +                        }
> +                    }
> +                }
> +            }
>           }
>       }
>       if (devtype) {
> @@ -621,6 +642,22 @@ static bool s390_build_iplb(DeviceState *dev_st, IplParameterBlock *iplb)
>               iplb->pbt = S390_IPL_TYPE_PCI;
>               iplb->pci.fid = cpu_to_be32(pbdev->fid);
>               break;
> +        case PCI_DEVTYPE_SCSI:
> +            sd = SCSI_DEVICE(dev_st);
> +            scsi_lp = object_property_get_str(OBJECT(sd), "loadparm", NULL);
> +            if (scsi_lp && strlen(scsi_lp) > 0) {
> +                lp = scsi_lp;
> +            }
> +            iplb->len = cpu_to_be32(S390_IPLB_MIN_PCI_LEN);
> +            iplb->blk0_len =
> +                cpu_to_be32(S390_IPLB_MIN_PCI_LEN - S390_IPLB_HEADER_LEN);
> +            iplb->pbt = S390_IPL_TYPE_QEMU_SCSI;
> +            iplb->scsi.lun = cpu_to_be32(sd->lun);
> +            iplb->scsi.target = cpu_to_be16(sd->id);
> +            iplb->scsi.channel = cpu_to_be16(sd->channel);
> +            iplb->scsi.bus = S390_IPL_TYPE_PCI;
> +            iplb->scsi.fid = cpu_to_be32(pbdev->fid);
> +            break;
>           default:
>               return false;
>           }
> diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
> index a2a24b024f..d2a2ac3138 100644
> --- a/pc-bios/s390-ccw/main.c
> +++ b/pc-bios/s390-ccw/main.c
> @@ -267,6 +267,9 @@ static bool find_boot_device(void)
>               blk_schid.ssid = iplb->scsi.ssid & 0x3;
>               found = find_subch(iplb->scsi.devno);
>               break;
> +        case S390_IPL_TYPE_PCI:
> +            found = find_fid(iplb->scsi.fid);
> +            break;
>           default:
>               puts("Unrecognized SCSI controller");
>               break;

Re: [PATCH v3 7/8] s390x: Find scsi-pci boot device and build IPLB

[Eric Farman]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> Add logic to identify a virtio-pci scsi controller and target lun with
> assigned bootindex, then build IPLB for it.
> 
> Unfence PCI case for scsi devices in BIOS.
> 
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   hw/s390x/ipl.c          | 37 +++++++++++++++++++++++++++++++++++++
>   pc-bios/s390-ccw/main.c |  3 +++
>   2 files changed, 40 insertions(+)

Tested-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>

> 
> diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
> index 6969e11b27..0cab043b12 100644
> --- a/hw/s390x/ipl.c
> +++ b/hw/s390x/ipl.c
> @@ -402,6 +402,7 @@ static CcwDevice *s390_get_ccw_device(DeviceState *dev_st, int *devtype)
>   }
>   
>   #define PCI_DEVTYPE_VIRTIO       0x05
> +#define PCI_DEVTYPE_SCSI         0x06
>   
>   static S390PCIBusDevice *s390_get_pci_device(DeviceState *dev_st, int *devtype)
>   {
> @@ -417,6 +418,26 @@ static S390PCIBusDevice *s390_get_pci_device(DeviceState *dev_st, int *devtype)
>               if (pbdev) {
>                   tmp_dt = PCI_DEVTYPE_VIRTIO;
>               }
> +        } else {
> +            SCSIDevice *sd = (SCSIDevice *)
> +                object_dynamic_cast(OBJECT(dev_st), TYPE_SCSI_DEVICE);
> +            if (sd) {
> +                SCSIBus *sbus = scsi_bus_from_device(sd);
> +                VirtIODevice *vdev = (VirtIODevice *)
> +                    object_dynamic_cast(OBJECT(sbus->qbus.parent),
> +                                                TYPE_VIRTIO_DEVICE);
> +                if (vdev) {
> +                    pci_dev = (PCIDevice *)
> +                        object_dynamic_cast(OBJECT(qdev_get_parent_bus(DEVICE(vdev))->parent),
> +                                            TYPE_PCI_DEVICE);
> +                    if (pci_dev) {
> +                        pbdev = s390_pci_find_dev_by_pci(s390_get_phb(), pci_dev);
> +                        if (pbdev) {
> +                            tmp_dt = PCI_DEVTYPE_SCSI;
> +                        }
> +                    }
> +                }
> +            }
>           }
>       }
>       if (devtype) {
> @@ -621,6 +642,22 @@ static bool s390_build_iplb(DeviceState *dev_st, IplParameterBlock *iplb)
>               iplb->pbt = S390_IPL_TYPE_PCI;
>               iplb->pci.fid = cpu_to_be32(pbdev->fid);
>               break;
> +        case PCI_DEVTYPE_SCSI:
> +            sd = SCSI_DEVICE(dev_st);
> +            scsi_lp = object_property_get_str(OBJECT(sd), "loadparm", NULL);
> +            if (scsi_lp && strlen(scsi_lp) > 0) {
> +                lp = scsi_lp;
> +            }
> +            iplb->len = cpu_to_be32(S390_IPLB_MIN_PCI_LEN);
> +            iplb->blk0_len =
> +                cpu_to_be32(S390_IPLB_MIN_PCI_LEN - S390_IPLB_HEADER_LEN);
> +            iplb->pbt = S390_IPL_TYPE_QEMU_SCSI;
> +            iplb->scsi.lun = cpu_to_be32(sd->lun);
> +            iplb->scsi.target = cpu_to_be16(sd->id);
> +            iplb->scsi.channel = cpu_to_be16(sd->channel);
> +            iplb->scsi.bus = S390_IPL_TYPE_PCI;
> +            iplb->scsi.fid = cpu_to_be32(pbdev->fid);
> +            break;
>           default:
>               return false;
>           }
> diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
> index a2a24b024f..d2a2ac3138 100644
> --- a/pc-bios/s390-ccw/main.c
> +++ b/pc-bios/s390-ccw/main.c
> @@ -267,6 +267,9 @@ static bool find_boot_device(void)
>               blk_schid.ssid = iplb->scsi.ssid & 0x3;
>               found = find_subch(iplb->scsi.devno);
>               break;
> +        case S390_IPL_TYPE_PCI:
> +            found = find_fid(iplb->scsi.fid);
> +            break;
>           default:
>               puts("Unrecognized SCSI controller");
>               break;

Re: [PATCH v3 7/8] s390x: Find scsi-pci boot device and build IPLB

[Jason J. Herne]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> Add logic to identify a virtio-pci scsi controller and target lun with
> assigned bootindex, then build IPLB for it.
> 
> Unfence PCI case for scsi devices in BIOS.
> 
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   hw/s390x/ipl.c          | 37 +++++++++++++++++++++++++++++++++++++
>   pc-bios/s390-ccw/main.c |  3 +++
>   2 files changed, 40 insertions(+)
lgtm
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>

[PATCH v3 8/8] tests/qtest: Add s390x PCI SCSI fallback test to cdrom-test.c

[jrossi]

From: Jared Rossi <jrossi@linux.ibm.com>

Add a test to verify that a guest can use a PCI controlled CD as a fallback boot
device after a failed CCW IPL.

Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
---
 tests/qtest/cdrom-test.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tests/qtest/cdrom-test.c b/tests/qtest/cdrom-test.c
index a65854d2bc..ab34930404 100644
--- a/tests/qtest/cdrom-test.c
+++ b/tests/qtest/cdrom-test.c
@@ -253,6 +253,14 @@ static void add_s390x_tests(void)
                             "-drive if=none,id=d1,media=cdrom,file=",
                             test_cdboot);
     }
+    if (qtest_has_device("virtio-scsi-pci")) {
+        qtest_add_data_func("cdrom/boot/pci-scsi-fallback-from-blk-ccw",
+                            "-device virtio-scsi-pci -device virtio-serial "
+                            "-device virtio-blk-ccw,drive=d1,bootindex=1 "
+                            "-drive driver=null-co,read-zeroes=on,if=none,id=d1 "
+                            "-device scsi-cd,drive=d2,bootindex=2 "
+                            "-drive if=none,id=d2,media=cdrom,file=", test_cdboot);
+    }
 }
 
 int main(int argc, char **argv)
-- 
2.54.0

Re: [PATCH v3 8/8] tests/qtest: Add s390x PCI SCSI fallback test to cdrom-test.c

[Joshua Daley]

On 8/31/2026 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> Add a test to verify that a guest can use a PCI controlled CD as a fallback boot
> device after a failed CCW IPL.
> 
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   tests/qtest/cdrom-test.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/tests/qtest/cdrom-test.c b/tests/qtest/cdrom-test.c
> index a65854d2bc..ab34930404 100644
> --- a/tests/qtest/cdrom-test.c
> +++ b/tests/qtest/cdrom-test.c
> @@ -253,6 +253,14 @@ static void add_s390x_tests(void)
>                               "-drive if=none,id=d1,media=cdrom,file=",
>                               test_cdboot);
>       }
> +    if (qtest_has_device("virtio-scsi-pci")) {
> +        qtest_add_data_func("cdrom/boot/pci-scsi-fallback-from-blk-ccw",
> +                            "-device virtio-scsi-pci -device virtio-serial "
> +                            "-device virtio-blk-ccw,drive=d1,bootindex=1 "
> +                            "-drive driver=null-co,read-zeroes=on,if=none,id=d1 "
> +                            "-device scsi-cd,drive=d2,bootindex=2 "
> +                            "-drive if=none,id=d2,media=cdrom,file=", test_cdboot);
> +    }
>   }
>   
>   int main(int argc, char **argv)

Tested-by: Joshua Daley <jdaley@linux.ibm.com>

Note: need to install xorriso to run these tests. If it is not installed, they will not run, with no indication of why. In cdrom-test.c:main(), if the exec_xorrisofs check fails, we return g_test_run() early, without having added any subtests. Maybe a separate patch can add a message that is printed in that case.


meson test --suite qtest-s390x 'qtest-s390x/cdrom-test'

...
# starting QEMU: exec ./qemu-system-s390x -qtest unix:/tmp/qtest-185425.sock -qtest-log /dev/null -chardev socket,path=/tmp/qtest-185425.qmp,id=char0 -object monitor-qmp,id=qmp0,chardev=char0 -display none -audio none -run-with exit-with-parent=on -accel kvm -accel tcg -no-shutdown -device virtio-scsi-pci -device virtio-serial -device virtio-blk-ccw,drive=d1,bootindex=1 -drive driver=null-co,read-zeroes=on,if=none,id=d1 -device scsi-cd,drive=d2,bootindex=2 -drive if=none,id=d2,media=cdrom,file=cdrom-boot-iso-g8yma5  -accel qtest
ok 8 /s390x/cdrom/boot/pci-scsi-fallback-from-blk-ccw

Also, I was able to boot via virtio-scsi-pci manually:

qemu-system-s390x \
-nographic \
-accel kvm \
-m 1024 \
-machine s390-ccw-virtio \
-drive file=Fedora-Server-dvd-s390x-43-1.6.iso,media=cdrom,if=none,id=cdrom0 \
-device virtio-scsi-pci \
-device scsi-cd,drive=cdrom0,bootindex=1

Re: [PATCH v3 8/8] tests/qtest: Add s390x PCI SCSI fallback test to cdrom-test.c

[Eric Farman]

On 8/31/26 3:49 PM, jrossi@linux.ibm.com wrote:
> From: Jared Rossi <jrossi@linux.ibm.com>
> 
> Add a test to verify that a guest can use a PCI controlled CD as a fallback boot
> device after a failed CCW IPL.
> 
> Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
> ---
>   tests/qtest/cdrom-test.c | 8 ++++++++
>   1 file changed, 8 insertions(+)

There are more permutations that we can add in the future, but this is a 
good start.

Tested-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>

> 
> diff --git a/tests/qtest/cdrom-test.c b/tests/qtest/cdrom-test.c
> index a65854d2bc..ab34930404 100644
> --- a/tests/qtest/cdrom-test.c
> +++ b/tests/qtest/cdrom-test.c
> @@ -253,6 +253,14 @@ static void add_s390x_tests(void)
>                               "-drive if=none,id=d1,media=cdrom,file=",
>                               test_cdboot);
>       }
> +    if (qtest_has_device("virtio-scsi-pci")) {
> +        qtest_add_data_func("cdrom/boot/pci-scsi-fallback-from-blk-ccw",
> +                            "-device virtio-scsi-pci -device virtio-serial "
> +                            "-device virtio-blk-ccw,drive=d1,bootindex=1 "
> +                            "-drive driver=null-co,read-zeroes=on,if=none,id=d1 "
> +                            "-device scsi-cd,drive=d2,bootindex=2 "
> +                            "-drive if=none,id=d2,media=cdrom,file=", test_cdboot);
> +    }
>   }
>   
>   int main(int argc, char **argv)