[PATCH 1/2] Allow use of pc machine type (accel=xen) for Xen HVM domains.

[PATCH 1/2] Allow use of pc machine type (accel=xen) for Xen HVM domains.

[Paul Durrant]

Xen HVM domains normally spawn QEMU with a dedicated xenfv machine type. The
initialization code for this machine type can easily be pulled into the
generic pc initialization code and guarded with a test for whether the xen
accelerator options is specified, which is more consistent with the way
other accelerators are used.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
---
 hw/i386/pc_piix.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index d618570..6d3f161 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -91,6 +91,10 @@ static void pc_init1(MemoryRegion *system_memory,
     DeviceState *icc_bridge;
     FWCfgState *fw_cfg = NULL;
 
+    if (xen_hvm_init() != 0) {
+        hw_error("xen hardware virtual machine initialisation failed");
+    }
+
     icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
     object_property_add_child(qdev_get_machine(), "icc-bridge",
                               OBJECT(icc_bridge), NULL);
@@ -320,9 +324,6 @@ static void pc_init_isa(QEMUMachineInitArgs *args)
 #ifdef CONFIG_XEN
 static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
 {
-    if (xen_hvm_init() != 0) {
-        hw_error("xen hardware virtual machine initialisation failed");
-    }
     pc_init_pci(args);
 }
 #endif
-- 
1.7.10.4

[PATCH 1/2] Allow use of pc machine type (accel=xen) for Xen HVM domains.

[Paul Durrant]

Xen HVM domains normally spawn QEMU with a dedicated xenfv machine type. The
initialization code for this machine type can easily be pulled into the
generic pc initialization code and guarded with a test for whether the xen
accelerator options is specified, which is more consistent with the way
other accelerators are used.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
---
 hw/i386/pc_piix.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index d618570..7bbb59a 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -1,3 +1,4 @@
+
 /*
  * QEMU PC System Emulator
  *
@@ -91,6 +92,10 @@ static void pc_init1(MemoryRegion *system_memory,
     DeviceState *icc_bridge;
     FWCfgState *fw_cfg = NULL;
 
+    if (xen_enabled() && xen_hvm_init() != 0) {
+        hw_error("xen hardware virtual machine initialisation failed");
+    }
+
     icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
     object_property_add_child(qdev_get_machine(), "icc-bridge",
                               OBJECT(icc_bridge), NULL);
@@ -320,9 +325,6 @@ static void pc_init_isa(QEMUMachineInitArgs *args)
 #ifdef CONFIG_XEN
 static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
 {
-    if (xen_hvm_init() != 0) {
-        hw_error("xen hardware virtual machine initialisation failed");
-    }
     pc_init_pci(args);
 }
 #endif
-- 
1.7.10.4

[PATCH 1/2] Allow use of pc machine type (accel=xen) for Xen HVM domains.

[Paul Durrant]

Xen HVM domains normally spawn QEMU with a dedicated xenfv machine type. The
initialization code for this machine type can easily be pulled into the
generic pc initialization code and guarded with a test for whether the xen
accelerator options is specified, which is more consistent with the way
other accelerators are used.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
---
 hw/i386/pc_piix.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index d618570..f96e0c2 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -91,6 +91,11 @@ static void pc_init1(MemoryRegion *system_memory,
     DeviceState *icc_bridge;
     FWCfgState *fw_cfg = NULL;
 
+    if (xen_enabled() && xen_hvm_init() != 0) {
+        fprintf(stderr, "xen hardware virtual machine initialisation failed\n");
+        exit(1);
+    }
+
     icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
     object_property_add_child(qdev_get_machine(), "icc-bridge",
                               OBJECT(icc_bridge), NULL);
@@ -320,9 +325,6 @@ static void pc_init_isa(QEMUMachineInitArgs *args)
 #ifdef CONFIG_XEN
 static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
 {
-    if (xen_hvm_init() != 0) {
-        hw_error("xen hardware virtual machine initialisation failed");
-    }
     pc_init_pci(args);
 }
 #endif
-- 
1.7.10.4

[PATCH 2/2] Move hardcoded initialization of xen-platform device.

[Paul Durrant]

Creation of the xen-platform device is currently hardcoded into machine
type pc's initialization code, guarded by a test for the whether the xen
accelerator is enabled. This patch moves the creation of xen-platform into
the initialization code of the xenfv machine type. This maintains backwards
compatibility for that machine type but allows more flexibility if another
machine type is used with Xen HVM domains.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
---
 hw/i386/pc_piix.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index f96e0c2..c294138 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -179,9 +179,6 @@ static void pc_init1(MemoryRegion *system_memory,
     pc_register_ferr_irq(gsi[13]);
 
     pc_vga_init(isa_bus, pci_enabled ? pci_bus : NULL);
-    if (xen_enabled()) {
-        pci_create_simple(pci_bus, -1, "xen-platform");
-    }
 
     /* init basic PC hardware */
     pc_basic_device_init(isa_bus, gsi, &rtc_state, &floppy, xen_enabled());
@@ -325,7 +322,14 @@ static void pc_init_isa(QEMUMachineInitArgs *args)
 #ifdef CONFIG_XEN
 static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
 {
+    PCIBus *bus;
+
     pc_init_pci(args);
+
+    bus = pci_find_root_bus(0);
+    if (bus != NULL) {
+        pci_create_simple(bus, -1, "xen-platform");
+    }
 }
 #endif
 
-- 
1.7.10.4

Re: [PATCH 0/2] Remove hardcoded xen-platform device initialization (v4)

[Paolo Bonzini]

Il 18/06/2013 13:16, Paul Durrant ha scritto:
> Because of concerns over backwards compatibility and a suggestion that
> xenfv should be retired in favour of using the pc machine type I have re-
> worked my original patch into 2 patches:
> 
> [PATCH 1/2] Allow use of pc machine type (accel=xen) for Xen HVM
> [PATCH 2/2] Move hardcoded initialization of xen-platform device.
> 
> Application of both these patches allows alternative pc machine types to be
> used with the accel=xen option, but preserves the hardcoded creation of
> the xen-platform device only for machine type xenfv.

Perfect!

Paolo

> v3:
> - Add test for xen_enabled() that went missing in v2
> 
> v4:
> - Remove erroneous whitespace hunk
> - Replace hw_error() with fprintf()+exit(1)
> - Add braces to single-line if
> 
> 

Re: [PATCH 1/2] Allow use of pc machine type (accel=xen) for Xen HVM domains.

[Stefano Stabellini]

On Tue, 18 Jun 2013, Paul Durrant wrote:
> Xen HVM domains normally spawn QEMU with a dedicated xenfv machine type. The
> initialization code for this machine type can easily be pulled into the
> generic pc initialization code and guarded with a test for whether the xen
> accelerator options is specified, which is more consistent with the way
> other accelerators are used.
> 
> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>

Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>


>  hw/i386/pc_piix.c |    8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index d618570..f96e0c2 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -91,6 +91,11 @@ static void pc_init1(MemoryRegion *system_memory,
>      DeviceState *icc_bridge;
>      FWCfgState *fw_cfg = NULL;
>  
> +    if (xen_enabled() && xen_hvm_init() != 0) {
> +        fprintf(stderr, "xen hardware virtual machine initialisation failed\n");
> +        exit(1);
> +    }
> +
>      icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
>      object_property_add_child(qdev_get_machine(), "icc-bridge",
>                                OBJECT(icc_bridge), NULL);
> @@ -320,9 +325,6 @@ static void pc_init_isa(QEMUMachineInitArgs *args)
>  #ifdef CONFIG_XEN
>  static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
>  {
> -    if (xen_hvm_init() != 0) {
> -        hw_error("xen hardware virtual machine initialisation failed");
> -    }
>      pc_init_pci(args);
>  }
>  #endif
> -- 
> 1.7.10.4
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
> 

Re: [PATCH 2/2] Move hardcoded initialization of xen-platform device.

[Stefano Stabellini]

On Tue, 18 Jun 2013, Paul Durrant wrote:
> Creation of the xen-platform device is currently hardcoded into machine
> type pc's initialization code, guarded by a test for the whether the xen
> accelerator is enabled. This patch moves the creation of xen-platform into
> the initialization code of the xenfv machine type. This maintains backwards
> compatibility for that machine type but allows more flexibility if another
> machine type is used with Xen HVM domains.
> 
> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>

Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>


>  hw/i386/pc_piix.c |   10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index f96e0c2..c294138 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -179,9 +179,6 @@ static void pc_init1(MemoryRegion *system_memory,
>      pc_register_ferr_irq(gsi[13]);
>  
>      pc_vga_init(isa_bus, pci_enabled ? pci_bus : NULL);
> -    if (xen_enabled()) {
> -        pci_create_simple(pci_bus, -1, "xen-platform");
> -    }
>  
>      /* init basic PC hardware */
>      pc_basic_device_init(isa_bus, gsi, &rtc_state, &floppy, xen_enabled());
> @@ -325,7 +322,14 @@ static void pc_init_isa(QEMUMachineInitArgs *args)
>  #ifdef CONFIG_XEN
>  static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
>  {
> +    PCIBus *bus;
> +
>      pc_init_pci(args);
> +
> +    bus = pci_find_root_bus(0);
> +    if (bus != NULL) {
> +        pci_create_simple(bus, -1, "xen-platform");
> +    }
>  }
>  #endif

Re: [PATCH 1/2] Allow use of pc machine type (accel=xen) for Xen HVM domains.

[Stefano Stabellini]

On Tue, 18 Jun 2013, Paul Durrant wrote:
> Xen HVM domains normally spawn QEMU with a dedicated xenfv machine type. The
> initialization code for this machine type can easily be pulled into the
> generic pc initialization code and guarded with a test for whether the xen
> accelerator options is specified, which is more consistent with the way
> other accelerators are used.
> 
> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
> ---
>  hw/i386/pc_piix.c |    8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index d618570..f96e0c2 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -91,6 +91,11 @@ static void pc_init1(MemoryRegion *system_memory,
>      DeviceState *icc_bridge;
>      FWCfgState *fw_cfg = NULL;
>  
> +    if (xen_enabled() && xen_hvm_init() != 0) {
> +        fprintf(stderr, "xen hardware virtual machine initialisation failed\n");
> +        exit(1);
> +    }
> +
>      icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
>      object_property_add_child(qdev_get_machine(), "icc-bridge",
>                                OBJECT(icc_bridge), NULL);

I was about to submit a pull request with this patch, but unfortunately
it breaks non-xen compilations:

hw/i386/pc_piix.o: In function `pc_init1':
/local/scratch/sstabellini/qemu/hw/i386/pc_piix.c:94: undefined reference to `xen_hvm_init'

you need to add the function to xen-stub.c:

diff --git a/xen-stub.c b/xen-stub.c
index 6f0516a..47c8e73 100644
--- a/xen-stub.c
+++ b/xen-stub.c
@@ -63,3 +63,8 @@ void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
 void xen_modified_memory(ram_addr_t start, ram_addr_t length)
 {
 }
+
+int xen_hvm_init(void)
+{
+    return 0;
+}

I'll include this change in the pull request

Re: [PATCH 1/2] Allow use of pc machine type (accel=xen) for Xen HVM domains.

[Paul Durrant]

> -----Original Message-----
> From: Stefano Stabellini [mailto:stefano.stabellini@eu.citrix.com]
> Sent: 25 June 2013 13:02
> To: Paul Durrant
> Cc: qemu-devel@nongnu.org; xen-devel@lists.xen.org
> Subject: Re: [Xen-devel] [PATCH 1/2] Allow use of pc machine type
> (accel=xen) for Xen HVM domains.
> 
> On Tue, 18 Jun 2013, Paul Durrant wrote:
> > Xen HVM domains normally spawn QEMU with a dedicated xenfv machine
> type. The
> > initialization code for this machine type can easily be pulled into the
> > generic pc initialization code and guarded with a test for whether the xen
> > accelerator options is specified, which is more consistent with the way
> > other accelerators are used.
> >
> > Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
> > ---
> >  hw/i386/pc_piix.c |    8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> > index d618570..f96e0c2 100644
> > --- a/hw/i386/pc_piix.c
> > +++ b/hw/i386/pc_piix.c
> > @@ -91,6 +91,11 @@ static void pc_init1(MemoryRegion
> *system_memory,
> >      DeviceState *icc_bridge;
> >      FWCfgState *fw_cfg = NULL;
> >
> > +    if (xen_enabled() && xen_hvm_init() != 0) {
> > +        fprintf(stderr, "xen hardware virtual machine initialisation failed\n");
> > +        exit(1);
> > +    }
> > +
> >      icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
> >      object_property_add_child(qdev_get_machine(), "icc-bridge",
> >                                OBJECT(icc_bridge), NULL);
> 
> I was about to submit a pull request with this patch, but unfortunately
> it breaks non-xen compilations:
> 
> hw/i386/pc_piix.o: In function `pc_init1':
> /local/scratch/sstabellini/qemu/hw/i386/pc_piix.c:94: undefined reference
> to `xen_hvm_init'
> 
> you need to add the function to xen-stub.c:
> 
> diff --git a/xen-stub.c b/xen-stub.c
> index 6f0516a..47c8e73 100644
> --- a/xen-stub.c
> +++ b/xen-stub.c
> @@ -63,3 +63,8 @@ void qmp_xen_set_global_dirty_log(bool enable, Error
> **errp)
>  void xen_modified_memory(ram_addr_t start, ram_addr_t length)
>  {
>  }
> +
> +int xen_hvm_init(void)
> +{
> +    return 0;
> +}
> 
> I'll include this change in the pull request

Ok. Thanks for the fix-up.

  Paul