[PATCH 02/22] iommu/amd: Introduce vIOMMU-specific events and event info

Suravee Suthikulpanit
2026-03-30T08:42:55Z

Adding support for new vIOMMU events:
* Guest Event Fault event
* vIOMMU Hardware Error event

Also, adding support for the additional vIOMMU related flags
in existing events.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
drivers/iommu/amd/amd_iommu_types.h | 3 ++
drivers/iommu/amd/iommu.c | 58 ++++++++++++++++++++++-------
2 files changed, 48 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index cfcbad6c28ff..31f7f426bab6 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -153,6 +153,9 @@
#define EVENT_TYPE_IOTLB_INV_TO 0x7
#define EVENT_TYPE_INV_DEV_REQ 0x8
#define EVENT_TYPE_INV_PPR_REQ 0x9
+#define EVENT_TYPE_GUEST_EVENT_FAULT 0xb
+#define EVENT_TYPE_VIOMMU_HW_ERR 0xc
+
#define EVENT_TYPE_RMP_FAULT 0xd
#define EVENT_TYPE_RMP_HW_ERR 0xe
#define EVENT_DEVID_MASK 0xffff
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index ffa65a97ba86..d1f997b9a90b 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -849,7 +849,7 @@ static void amd_iommu_report_rmp_fault(struct amd_iommu *iommu, volatile u32 *ev

static void amd_iommu_report_page_fault(struct amd_iommu *iommu,
u16 devid, u16 domain_id,
- u64 address, int flags)
+ u64 address, int flags, u8 vflags)
{
struct iommu_dev_data *dev_data = NULL;
struct pci_dev *pdev;
@@ -884,13 +884,13 @@ static void amd_iommu_report_page_fault(struct amd_iommu *iommu,
}

if (__ratelimit(&dev_data->rs)) {
- pci_err(pdev, "Event logged [IO_PAGE_FAULT domain=0x%04x address=0x%llx flags=0x%04x]\n",
- domain_id, address, flags);
+ pci_err(pdev, "Event logged [IO_PAGE_FAULT domain=0x%04x address=0x%llx flags=0x%04x vflags=%#x]\n",
+ domain_id, address, flags, vflags);
}
} else {
- pr_err_ratelimited("Event logged [IO_PAGE_FAULT device=%04x:%02x:%02x.%x domain=0x%04x address=0x%llx flags=0x%04x]\n",
+ pr_err_ratelimited("Event logged [IO_PAGE_FAULT device=%04x:%02x:%02x.%x domain=0x%04x address=0x%llx flags=0x%04x vflags=%#x]\n",
iommu->pci_seg->id, PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
- domain_id, address, flags);
+ domain_id, address, flags, vflags);
}

out:
@@ -927,29 +927,42 @@ static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
}

if (type == EVENT_TYPE_IO_FAULT) {
- amd_iommu_report_page_fault(iommu, devid, pasid, address, flags);
+ u8 vflags = (event[0] >> 27) & 0x1F;
+
+ amd_iommu_report_page_fault(iommu, devid, pasid, address, flags, vflags);
return;
}

switch (type) {
case EVENT_TYPE_ILL_DEV:
- dev_err(dev, "Event logged [ILLEGAL_DEV_TABLE_ENTRY device=%04x:%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x]\n",
+ {
+ u8 vflags = (event[0] >> 27) & 0x1F;
+
+ dev_err(dev, "Event logged [ILLEGAL_DEV_TABLE_ENTRY deice=%04x:%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x vflags=%#x]\n",
iommu->pci_seg->id, PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
- pasid, address, flags);
+ pasid, address, flags, vflags);
dev_err(dev, "Control Reg : 0x%llx\n", ctrl);
dump_dte_entry(iommu, devid);
break;
+ }
case EVENT_TYPE_DEV_TAB_ERR:
- dev_err(dev, "Event logged [DEV_TAB_HARDWARE_ERROR device=%04x:%02x:%02x.%x "
- "address=0x%llx flags=0x%04x]\n",
+ {
+ u8 vflags = (event[0] >> 27) & 0x1F;
+
+ dev_err(dev, "Event logged [DEV_TAB_HARDWARE_ERROR device=%04x:%02x:%02x.%x address=%#llx flags=%#04x vlfags=%#x]\n",
iommu->pci_seg->id, PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
- address, flags);
+ address, flags, vflags);
break;
+ }
case EVENT_TYPE_PAGE_TAB_ERR:
- dev_err(dev, "Event logged [PAGE_TAB_HARDWARE_ERROR device=%04x:%02x:%02x.%x pasid=0x%04x address=0x%llx flags=0x%04x]\n",
+ {
+ u8 vflags = (event[0] >> 27) & 0x1F;
+
+ dev_err(dev, "Event logged [PAGE_TAB_HARDWARE_ERROR device=%04x:%02x:%02x.%x pasid=0x%04x address=0x%llx flags=0x%04x vflags=%#x]\n",
iommu->pci_seg->id, PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
- pasid, address, flags);
+ pasid, address, flags, vflags);
break;
+ }
case EVENT_TYPE_ILL_CMD:
dev_err(dev, "Event logged [ILLEGAL_COMMAND_ERROR address=0x%llx]\n", address);
dump_command(address);
@@ -981,6 +994,25 @@ static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
iommu->pci_seg->id, PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
pasid, address, flags, tag);
break;
+ case EVENT_TYPE_GUEST_EVENT_FAULT:
+ {
+ u8 gid = event[1] & 0xFFFF;
+ u8 vflags = (event[0] >> 27) & 0x1F;
+
+ dev_err(dev, "Event logged [GUEST_EVENT_FAULT gid=#%x flags=0x%04x vflags=%#x]\n",
+ gid, flags, vflags);
+ break;
+ }
+ case EVENT_TYPE_VIOMMU_HW_ERR:
+ {
+ u16 gid = event[0] & 0xFFFF;
+ u8 src = (event[0] >> 16) & 0x3;
+ u8 vflags = (event[0] >> 27) & 0x1F;
+
+ dev_err(dev, "Event logged [VIOMMU_HW_ERR gid=%#x address=%#llx src=%#x flags=%#x vflags=%#x]\n",
+ gid, address, src, flags, vflags);
+ break;
+ }
default:
dev_err(dev, "Event logged [UNKNOWN event[0]=0x%08x event[1]=0x%08x event[2]=0x%08x event[3]=0x%08x\n",
event[0], event[1], event[2], event[3]);
--
2.34.1