[PATCH v4 0/8] amd_iommu: Fixes to align with AMDVi specification

[PATCH v4 0/8] amd_iommu: Fixes to align with AMDVi specification

[Alejandro Jimenez]

Added two new changes based on observations from Ethan. Like the rest of
the fixes in this series, these do not trigger problems today given the
limited feature set supported. Re-tested the series with emulated devices,
VFIO passthrough usage with amd-iommu is not possible since merge of commit
31753d5a336f ("hw/i386/amd_iommu: Fix device setup failure when PT is on.")
regardless of guest kernel iommu mode.

Changes since v3:
- Made an additional change in PATCH 1 with correct encoding for
AMDVI_MAX_GVA_ADDR, adding Ethan as co-author. Dropped Vasant R-b.
- Added patch by Ethan fixing truncation bug.

Thank you,
Alejandro

v3: https://lore.kernel.org/all/20250529193023.3590780-1-alejandro.j.jimenez@oracle.com/

Alejandro Jimenez (7):
  amd_iommu: Fix Miscellaneous Information Register 0 encoding
  amd_iommu: Fix Device ID decoding for INVALIDATE_IOTLB_PAGES command
  amd_iommu: Update bitmasks representing DTE reserved fields
  amd_iommu: Fix masks for various IOMMU MMIO Registers
  amd_iommu: Fix mask to retrieve Interrupt Table Root Pointer from DTE
  amd_iommu: Fix the calculation for Device Table size
  amd_iommu: Remove duplicated definitions

Ethan Milon (1):
  amd_iommu: Fix truncation of oldval in amdvi_writeq

 hw/i386/amd_iommu.c | 17 +++++++------
 hw/i386/amd_iommu.h | 59 ++++++++++++++++++++++-----------------------
 2 files changed, 38 insertions(+), 38 deletions(-)


base-commit: a6f02277595136832c9e9bcaf447ab574f7b1128
-- 
2.43.5

[PATCH v4 1/8] amd_iommu: Fix Miscellaneous Information Register 0 encoding

[Alejandro Jimenez]

The definitions encoding the maximum Virtual, Physical, and Guest Virtual
Address sizes supported by the IOMMU are using incorrect offsets i.e. the
VASize and GVASize offsets are switched. The value in the GVAsize field is
also modified, since it was incorrectly encoded.

Cc: qemu-stable@nongnu.org
Fixes: d29a09ca6842 ("hw/i386: Introduce AMD IOMMU")
Co-developed-by: Ethan MILON <ethan.milon@eviden.com>
Signed-off-by: Ethan MILON <ethan.milon@eviden.com>
Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
---
 hw/i386/amd_iommu.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/hw/i386/amd_iommu.h b/hw/i386/amd_iommu.h
index 5672bdef89071..3b1d2e9da5347 100644
--- a/hw/i386/amd_iommu.h
+++ b/hw/i386/amd_iommu.h
@@ -196,9 +196,9 @@
 #define AMDVI_PAGE_SHIFT_4K 12
 #define AMDVI_PAGE_MASK_4K  (~((1ULL << AMDVI_PAGE_SHIFT_4K) - 1))
 
-#define AMDVI_MAX_VA_ADDR          (48UL << 5)
-#define AMDVI_MAX_PH_ADDR          (40UL << 8)
-#define AMDVI_MAX_GVA_ADDR         (48UL << 15)
+#define AMDVI_MAX_GVA_ADDR      (2UL << 5)
+#define AMDVI_MAX_PH_ADDR       (40UL << 8)
+#define AMDVI_MAX_VA_ADDR       (48UL << 15)
 
 /* Completion Wait data size */
 #define AMDVI_COMPLETION_DATA_SIZE    8
-- 
2.43.5

[PATCH v4 2/8] amd_iommu: Fix Device ID decoding for INVALIDATE_IOTLB_PAGES command

[Alejandro Jimenez]

The DeviceID bits are extracted using an incorrect offset in the call to
amdvi_iotlb_remove_page(). This field is read (correctly) earlier, so use
the value already retrieved for devid.

Cc: qemu-stable@nongnu.org
Fixes: d29a09ca6842 ("hw/i386: Introduce AMD IOMMU")
Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
---
 hw/i386/amd_iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index 963aa2450c997..c27efa504d19a 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -508,7 +508,7 @@ static void amdvi_inval_inttable(AMDVIState *s, uint64_t *cmd)
 static void iommu_inval_iotlb(AMDVIState *s, uint64_t *cmd)
 {
 
-    uint16_t devid = extract64(cmd[0], 0, 16);
+    uint16_t devid = cpu_to_le16(extract64(cmd[0], 0, 16));
     if (extract64(cmd[1], 1, 1) || extract64(cmd[1], 3, 1) ||
         extract64(cmd[1], 6, 6)) {
         amdvi_log_illegalcom_error(s, extract64(cmd[0], 60, 4),
@@ -521,7 +521,7 @@ static void iommu_inval_iotlb(AMDVIState *s, uint64_t *cmd)
                                     &devid);
     } else {
         amdvi_iotlb_remove_page(s, cpu_to_le64(extract64(cmd[1], 12, 52)) << 12,
-                                cpu_to_le16(extract64(cmd[1], 0, 16)));
+                                devid);
     }
     trace_amdvi_iotlb_inval();
 }
-- 
2.43.5

[PATCH v4 3/8] amd_iommu: Update bitmasks representing DTE reserved fields

[Alejandro Jimenez]

The DTE validation method verifies that all bits in reserved DTE fields are
unset. Update them according to the latest definition available in AMD I/O
Virtualization Technology (IOMMU) Specification - Section 2.2.2.1 Device
Table Entry Format. Remove the magic numbers and use a macro helper to
generate bitmasks covering the specified ranges for better legibility.

Note that some reserved fields specify that events are generated when they
contain non-zero bits, or checks are skipped under certain configurations.
This change only updates the reserved masks, checks for special conditions
are not yet implemented.

Cc: qemu-stable@nongnu.org
Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
---
 hw/i386/amd_iommu.c | 7 ++++---
 hw/i386/amd_iommu.h | 9 ++++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index c27efa504d19a..6e78047919cb6 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -848,9 +848,10 @@ static inline uint64_t amdvi_get_perms(uint64_t entry)
 static bool amdvi_validate_dte(AMDVIState *s, uint16_t devid,
                                uint64_t *dte)
 {
-    if ((dte[0] & AMDVI_DTE_LOWER_QUAD_RESERVED)
-        || (dte[1] & AMDVI_DTE_MIDDLE_QUAD_RESERVED)
-        || (dte[2] & AMDVI_DTE_UPPER_QUAD_RESERVED) || dte[3]) {
+    if ((dte[0] & AMDVI_DTE_QUAD0_RESERVED) ||
+        (dte[1] & AMDVI_DTE_QUAD1_RESERVED) ||
+        (dte[2] & AMDVI_DTE_QUAD2_RESERVED) ||
+        (dte[3] & AMDVI_DTE_QUAD3_RESERVED)) {
         amdvi_log_illegaldevtab_error(s, devid,
                                       s->devtab +
                                       devid * AMDVI_DEVTAB_ENTRY_SIZE, 0);
diff --git a/hw/i386/amd_iommu.h b/hw/i386/amd_iommu.h
index 3b1d2e9da5347..aacb29b617aec 100644
--- a/hw/i386/amd_iommu.h
+++ b/hw/i386/amd_iommu.h
@@ -25,6 +25,8 @@
 #include "hw/i386/x86-iommu.h"
 #include "qom/object.h"
 
+#define GENMASK64(h, l)  (((~0ULL) >> (63 - (h) + (l))) << (l))
+
 /* Capability registers */
 #define AMDVI_CAPAB_BAR_LOW           0x04
 #define AMDVI_CAPAB_BAR_HIGH          0x08
@@ -162,9 +164,10 @@
 #define AMDVI_FEATURE_PC                  (1ULL << 9) /* Perf counters       */
 
 /* reserved DTE bits */
-#define AMDVI_DTE_LOWER_QUAD_RESERVED  0x80300000000000fc
-#define AMDVI_DTE_MIDDLE_QUAD_RESERVED 0x0000000000000100
-#define AMDVI_DTE_UPPER_QUAD_RESERVED  0x08f0000000000000
+#define AMDVI_DTE_QUAD0_RESERVED        (GENMASK64(6, 2) | GENMASK64(63, 63))
+#define AMDVI_DTE_QUAD1_RESERVED        0
+#define AMDVI_DTE_QUAD2_RESERVED        GENMASK64(53, 52)
+#define AMDVI_DTE_QUAD3_RESERVED        (GENMASK64(14, 0) | GENMASK64(53, 48))
 
 /* AMDVI paging mode */
 #define AMDVI_GATS_MODE                 (2ULL <<  12)
-- 
2.43.5

[PATCH v4 4/8] amd_iommu: Fix masks for various IOMMU MMIO Registers

[Alejandro Jimenez]

Address various issues with definitions of the MMIO registers e.g. for the
Device Table Address Register, the size mask currently encompasses reserved
bits [11:9], so change it to only extract the bits [8:0] encoding size.

Convert masks to use GENMASK64 for consistency, and make unrelated
definitions independent.

Cc: qemu-stable@nongnu.org
Fixes: d29a09ca6842 ("hw/i386: Introduce AMD IOMMU")
Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
---
 hw/i386/amd_iommu.h | 38 +++++++++++++++++++-------------------
 1 file changed, 19 insertions(+), 19 deletions(-)

diff --git a/hw/i386/amd_iommu.h b/hw/i386/amd_iommu.h
index aacb29b617aec..988a485f808cc 100644
--- a/hw/i386/amd_iommu.h
+++ b/hw/i386/amd_iommu.h
@@ -68,34 +68,34 @@
 
 #define AMDVI_MMIO_SIZE               0x4000
 
-#define AMDVI_MMIO_DEVTAB_SIZE_MASK   ((1ULL << 12) - 1)
-#define AMDVI_MMIO_DEVTAB_BASE_MASK   (((1ULL << 52) - 1) & ~ \
-                                       AMDVI_MMIO_DEVTAB_SIZE_MASK)
+#define AMDVI_MMIO_DEVTAB_SIZE_MASK     GENMASK64(8, 0)
+#define AMDVI_MMIO_DEVTAB_BASE_MASK     GENMASK64(51, 12)
+
 #define AMDVI_MMIO_DEVTAB_ENTRY_SIZE  32
 #define AMDVI_MMIO_DEVTAB_SIZE_UNIT   4096
 
 /* some of this are similar but just for readability */
 #define AMDVI_MMIO_CMDBUF_SIZE_BYTE       (AMDVI_MMIO_COMMAND_BASE + 7)
 #define AMDVI_MMIO_CMDBUF_SIZE_MASK       0x0f
-#define AMDVI_MMIO_CMDBUF_BASE_MASK       AMDVI_MMIO_DEVTAB_BASE_MASK
-#define AMDVI_MMIO_CMDBUF_HEAD_MASK       (((1ULL << 19) - 1) & ~0x0f)
-#define AMDVI_MMIO_CMDBUF_TAIL_MASK       AMDVI_MMIO_EVTLOG_HEAD_MASK
+#define AMDVI_MMIO_CMDBUF_BASE_MASK       GENMASK64(51, 12)
+#define AMDVI_MMIO_CMDBUF_HEAD_MASK       GENMASK64(18, 4)
+#define AMDVI_MMIO_CMDBUF_TAIL_MASK       GENMASK64(18, 4)
 
 #define AMDVI_MMIO_EVTLOG_SIZE_BYTE       (AMDVI_MMIO_EVENT_BASE + 7)
-#define AMDVI_MMIO_EVTLOG_SIZE_MASK       AMDVI_MMIO_CMDBUF_SIZE_MASK
-#define AMDVI_MMIO_EVTLOG_BASE_MASK       AMDVI_MMIO_CMDBUF_BASE_MASK
-#define AMDVI_MMIO_EVTLOG_HEAD_MASK       (((1ULL << 19) - 1) & ~0x0f)
-#define AMDVI_MMIO_EVTLOG_TAIL_MASK       AMDVI_MMIO_EVTLOG_HEAD_MASK
+#define AMDVI_MMIO_EVTLOG_SIZE_MASK       0x0f
+#define AMDVI_MMIO_EVTLOG_BASE_MASK       GENMASK64(51, 12)
+#define AMDVI_MMIO_EVTLOG_HEAD_MASK       GENMASK64(18, 4)
+#define AMDVI_MMIO_EVTLOG_TAIL_MASK       GENMASK64(18, 4)
 
-#define AMDVI_MMIO_PPRLOG_SIZE_BYTE       (AMDVI_MMIO_EVENT_BASE + 7)
-#define AMDVI_MMIO_PPRLOG_HEAD_MASK       AMDVI_MMIO_EVTLOG_HEAD_MASK
-#define AMDVI_MMIO_PPRLOG_TAIL_MASK       AMDVI_MMIO_EVTLOG_HEAD_MASK
-#define AMDVI_MMIO_PPRLOG_BASE_MASK       AMDVI_MMIO_EVTLOG_BASE_MASK
-#define AMDVI_MMIO_PPRLOG_SIZE_MASK       AMDVI_MMIO_EVTLOG_SIZE_MASK
+#define AMDVI_MMIO_PPRLOG_SIZE_BYTE       (AMDVI_MMIO_PPR_BASE + 7)
+#define AMDVI_MMIO_PPRLOG_SIZE_MASK       0x0f
+#define AMDVI_MMIO_PPRLOG_BASE_MASK       GENMASK64(51, 12)
+#define AMDVI_MMIO_PPRLOG_HEAD_MASK       GENMASK64(18, 4)
+#define AMDVI_MMIO_PPRLOG_TAIL_MASK       GENMASK64(18, 4)
 
 #define AMDVI_MMIO_EXCL_ENABLED_MASK      (1ULL << 0)
 #define AMDVI_MMIO_EXCL_ALLOW_MASK        (1ULL << 1)
-#define AMDVI_MMIO_EXCL_LIMIT_MASK        AMDVI_MMIO_DEVTAB_BASE_MASK
+#define AMDVI_MMIO_EXCL_LIMIT_MASK        GENMASK64(51, 12)
 #define AMDVI_MMIO_EXCL_LIMIT_LOW         0xfff
 
 /* mmio control register flags */
@@ -132,14 +132,14 @@
 #define AMDVI_DEV_TRANSLATION_VALID       (1ULL << 1)
 #define AMDVI_DEV_MODE_MASK               0x7
 #define AMDVI_DEV_MODE_RSHIFT             9
-#define AMDVI_DEV_PT_ROOT_MASK            0xffffffffff000
+#define AMDVI_DEV_PT_ROOT_MASK            GENMASK64(51, 12)
 #define AMDVI_DEV_PT_ROOT_RSHIFT          12
 #define AMDVI_DEV_PERM_SHIFT              61
 #define AMDVI_DEV_PERM_READ               (1ULL << 61)
 #define AMDVI_DEV_PERM_WRITE              (1ULL << 62)
 
 /* Device table entry bits 64:127 */
-#define AMDVI_DEV_DOMID_ID_MASK          ((1ULL << 16) - 1)
+#define AMDVI_DEV_DOMID_ID_MASK             GENMASK64(15, 0)
 
 /* Event codes and flags, as stored in the info field */
 #define AMDVI_EVENT_ILLEGAL_DEVTAB_ENTRY  (0x1U << 12)
@@ -197,7 +197,7 @@
 #define AMDVI_PAGE_SIZE  (1ULL << AMDVI_PAGE_SHIFT)
 
 #define AMDVI_PAGE_SHIFT_4K 12
-#define AMDVI_PAGE_MASK_4K  (~((1ULL << AMDVI_PAGE_SHIFT_4K) - 1))
+#define AMDVI_PAGE_MASK_4K      GENMASK64(63, 12)
 
 #define AMDVI_MAX_GVA_ADDR      (2UL << 5)
 #define AMDVI_MAX_PH_ADDR       (40UL << 8)
-- 
2.43.5

[PATCH v4 5/8] amd_iommu: Fix mask to retrieve Interrupt Table Root Pointer from DTE

[Alejandro Jimenez]

Fix an off-by-one error in the definition of AMDVI_IR_PHYS_ADDR_MASK. The
current definition masks off the most significant bit of the Interrupt Table
Root ptr i.e. it only generates a mask with bits [50:6] set. See the AMD I/O
Virtualization Technology (IOMMU) Specification for the Interrupt Table
Root Pointer[51:6] field in the Device Table Entry format.

Cc: qemu-stable@nongnu.org
Fixes: b44159fe0078 ("x86_iommu/amd: Add interrupt remap support when VAPIC is not enabled")
Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
---
 hw/i386/amd_iommu.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/i386/amd_iommu.h b/hw/i386/amd_iommu.h
index 988a485f808cc..96fc5b621e609 100644
--- a/hw/i386/amd_iommu.h
+++ b/hw/i386/amd_iommu.h
@@ -231,7 +231,7 @@
 #define AMDVI_IR_INTCTL_PASS            1
 #define AMDVI_IR_INTCTL_REMAP           2
 
-#define AMDVI_IR_PHYS_ADDR_MASK         (((1ULL << 45) - 1) << 6)
+#define AMDVI_IR_PHYS_ADDR_MASK         GENMASK64(51, 6)
 
 /* MSI data 10:0 bits (section 2.2.5.1 Fig 14) */
 #define AMDVI_IRTE_OFFSET               0x7ff
-- 
2.43.5

[PATCH v4 6/8] amd_iommu: Fix the calculation for Device Table size

[Alejandro Jimenez]

Correctly calculate the Device Table size using the format encoded in the
Device Table Base Address Register (MMIO Offset 0000h).

Cc: qemu-stable@nongnu.org
Fixes: d29a09ca6842 ("hw/i386: Introduce AMD IOMMU")
Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
---
 hw/i386/amd_iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index 6e78047919cb6..92f94dc788c3d 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -665,8 +665,8 @@ static inline void amdvi_handle_devtab_write(AMDVIState *s)
     uint64_t val = amdvi_readq(s, AMDVI_MMIO_DEVICE_TABLE);
     s->devtab = (val & AMDVI_MMIO_DEVTAB_BASE_MASK);
 
-    /* set device table length */
-    s->devtab_len = ((val & AMDVI_MMIO_DEVTAB_SIZE_MASK) + 1 *
+    /* set device table length (i.e. number of entries table can hold) */
+    s->devtab_len = (((val & AMDVI_MMIO_DEVTAB_SIZE_MASK) + 1) *
                     (AMDVI_MMIO_DEVTAB_SIZE_UNIT /
                      AMDVI_MMIO_DEVTAB_ENTRY_SIZE));
 }
-- 
2.43.5

[PATCH v4 7/8] amd_iommu: Remove duplicated definitions

[Alejandro Jimenez]

No functional change.

Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
---
 hw/i386/amd_iommu.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/hw/i386/amd_iommu.h b/hw/i386/amd_iommu.h
index 96fc5b621e609..8b42913ed8dab 100644
--- a/hw/i386/amd_iommu.h
+++ b/hw/i386/amd_iommu.h
@@ -206,10 +206,6 @@
 /* Completion Wait data size */
 #define AMDVI_COMPLETION_DATA_SIZE    8
 
-#define AMDVI_COMMAND_SIZE   16
-/* Completion Wait data size */
-#define AMDVI_COMPLETION_DATA_SIZE    8
-
 #define AMDVI_COMMAND_SIZE   16
 
 #define AMDVI_INT_ADDR_FIRST    0xfee00000
-- 
2.43.5

[PATCH v4 8/8] amd_iommu: Fix truncation of oldval in amdvi_writeq

[Alejandro Jimenez]

From: Ethan Milon <ethan.milon@eviden.com>

The variable `oldval` was incorrectly declared as a 32-bit `uint32_t`.
This could lead to truncation and incorrect behavior where the upper
read-only 32 bits are significant.

Fix the type of `oldval` to match the return type of `ldq_le_p()`.

Cc: qemu-stable@nongnu.org
Fixes: d29a09ca6842 ("hw/i386: Introduce AMD IOMMU")
Signed-off-by: Ethan Milon <ethan.milon@eviden.com>
---
 hw/i386/amd_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index 92f94dc788c3d..5a24c17548d45 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -140,7 +140,7 @@ static void amdvi_writeq(AMDVIState *s, hwaddr addr, uint64_t val)
 {
     uint64_t romask = ldq_le_p(&s->romask[addr]);
     uint64_t w1cmask = ldq_le_p(&s->w1cmask[addr]);
-    uint32_t oldval = ldq_le_p(&s->mmior[addr]);
+    uint64_t oldval = ldq_le_p(&s->mmior[addr]);
     stq_le_p(&s->mmior[addr],
             ((oldval & romask) | (val & ~romask)) & ~(val & w1cmask));
 }
-- 
2.43.5

Re: [PATCH v4 8/8] amd_iommu: Fix truncation of oldval in amdvi_writeq

[Vasant Hegde]

On 6/17/2025 8:34 PM, Alejandro Jimenez wrote:
> From: Ethan Milon <ethan.milon@eviden.com>
> 
> The variable `oldval` was incorrectly declared as a 32-bit `uint32_t`.
> This could lead to truncation and incorrect behavior where the upper
> read-only 32 bits are significant.
> 
> Fix the type of `oldval` to match the return type of `ldq_le_p()`.
> 
> Cc: qemu-stable@nongnu.org
> Fixes: d29a09ca6842 ("hw/i386: Introduce AMD IOMMU")
> Signed-off-by: Ethan Milon <ethan.milon@eviden.com>

Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>

-Vasant

Re: [PATCH v4 1/8] amd_iommu: Fix Miscellaneous Information Register 0 encoding

[Vasant Hegde]

On 6/17/2025 8:34 PM, Alejandro Jimenez wrote:
> The definitions encoding the maximum Virtual, Physical, and Guest Virtual
> Address sizes supported by the IOMMU are using incorrect offsets i.e. the
> VASize and GVASize offsets are switched. The value in the GVAsize field is
> also modified, since it was incorrectly encoded.
> 
> Cc: qemu-stable@nongnu.org
> Fixes: d29a09ca6842 ("hw/i386: Introduce AMD IOMMU")
> Co-developed-by: Ethan MILON <ethan.milon@eviden.com>
> Signed-off-by: Ethan MILON <ethan.milon@eviden.com>
> Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>

Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>

-Vasant

Re: [PATCH v4 0/8] amd_iommu: Fixes to align with AMDVi specification

[Vasant Hegde]

Hi Michael,


On 6/17/2025 8:34 PM, Alejandro Jimenez wrote:
> Added two new changes based on observations from Ethan. Like the rest of
> the fixes in this series, these do not trigger problems today given the
> limited feature set supported. Re-tested the series with emulated devices,
> VFIO passthrough usage with amd-iommu is not possible since merge of commit
> 31753d5a336f ("hw/i386/amd_iommu: Fix device setup failure when PT is on.")
> regardless of guest kernel iommu mode.

I have reviewed this series. It looks good to me.

-Vasant


> 
> Changes since v3:
> - Made an additional change in PATCH 1 with correct encoding for
> AMDVI_MAX_GVA_ADDR, adding Ethan as co-author. Dropped Vasant R-b.
> - Added patch by Ethan fixing truncation bug.
> 
> Thank you,
> Alejandro
> 
> v3: https://lore.kernel.org/all/20250529193023.3590780-1-alejandro.j.jimenez@oracle.com/
> 
> Alejandro Jimenez (7):
>   amd_iommu: Fix Miscellaneous Information Register 0 encoding
>   amd_iommu: Fix Device ID decoding for INVALIDATE_IOTLB_PAGES command
>   amd_iommu: Update bitmasks representing DTE reserved fields
>   amd_iommu: Fix masks for various IOMMU MMIO Registers
>   amd_iommu: Fix mask to retrieve Interrupt Table Root Pointer from DTE
>   amd_iommu: Fix the calculation for Device Table size
>   amd_iommu: Remove duplicated definitions
> 
> Ethan Milon (1):
>   amd_iommu: Fix truncation of oldval in amdvi_writeq
> 
>  hw/i386/amd_iommu.c | 17 +++++++------
>  hw/i386/amd_iommu.h | 59 ++++++++++++++++++++++-----------------------
>  2 files changed, 38 insertions(+), 38 deletions(-)
> 
> 
> base-commit: a6f02277595136832c9e9bcaf447ab574f7b1128