From: Yi Liu <yi.l....@intel.com>
This replays guest pasid bindings after context cache invalidation.
This is a behavior to ensure safety. Actually, programmer should issue
pasid cache invalidation with proper granularity after issuing a context
cache invalidation.
Signed-off-by: Yi Liu <yi.l....@intel.com>
Signed-off-by: Yi Sun <yi.y....@linux.intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
---
hw/i386/intel_iommu.c | 42 ++++++++++++++++++++++++++++++++++
hw/i386/intel_iommu_internal.h | 2 ++
hw/i386/trace-events | 1 +
3 files changed, 45 insertions(+)
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index c35673eb58..887830a855 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -91,6 +91,10 @@ static void vtd_address_space_refresh_all(IntelIOMMUState
*s);
static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n);
static void vtd_pasid_cache_reset_locked(IntelIOMMUState *s);
+static void vtd_pasid_cache_sync(IntelIOMMUState *s,
+ VTDPASIDCacheInfo *pc_info);
+static void vtd_pasid_cache_devsi(IntelIOMMUState *s,
+ PCIBus *bus, uint16_t devfn);
static void vtd_panic_require_caching_mode(void)
{
@@ -2437,6 +2441,8 @@ static void vtd_iommu_replay_all(IntelIOMMUState *s)
static void vtd_context_global_invalidate(IntelIOMMUState *s)
{
+ VTDPASIDCacheInfo pc_info;
+
trace_vtd_inv_desc_cc_global();
/* Protects context cache */
vtd_iommu_lock(s);
@@ -2454,6 +2460,9 @@ static void vtd_context_global_invalidate(IntelIOMMUState
*s)
* VT-d emulation codes.
*/
vtd_iommu_replay_all(s);
+
+ pc_info.type = VTD_PASID_CACHE_GLOBAL_INV;
+ vtd_pasid_cache_sync(s, &pc_info);
}
#ifdef CONFIG_IOMMUFD
@@ -2686,6 +2695,15 @@ static void
vtd_context_device_invalidate(IntelIOMMUState *s,
* happened.
*/
vtd_address_space_sync(vtd_as);
+ /*
+ * Per spec, context flush should also be followed with PASID
+ * cache and iotlb flush. In order to work with a guest which
+ * doesn't follow spec and missed PASID cache flush, we have
+ * vtd_pasid_cache_devsi() to invalidate PASID caches of the
+ * passthrough device. Host iommu driver would flush piotlb
+ * when a pasid unbind is pass down to it.
+ */
+ vtd_pasid_cache_devsi(s, vtd_as->bus, devfn);
}
}
}
@@ -3410,6 +3428,11 @@ static gboolean vtd_flush_pasid_locked(gpointer key,
gpointer value,
break;
case VTD_PASID_CACHE_FORCE_RESET:
goto remove;
+ case VTD_PASID_CACHE_DEVSI:
+ if (pc_info->bus != vtd_as->bus || pc_info->devfn != vtd_as->devfn) {
+ return false;
+ }
+ break;
default:
error_setg(&error_fatal, "invalid pc_info->type for flush");
}
@@ -3616,6 +3639,11 @@ static void
vtd_replay_guest_pasid_bindings(IntelIOMMUState *s,
case VTD_PASID_CACHE_FORCE_RESET:
/* For force reset, no need to go further replay */
return;
+ case VTD_PASID_CACHE_DEVSI:
+ walk_info.bus = pc_info->bus;
+ walk_info.devfn = pc_info->devfn;
+ vtd_replay_pasid_bind_for_dev(s, start, end, &walk_info);
+ return;
default:
error_setg(&error_fatal, "invalid pc_info->type for replay");
}
@@ -3666,6 +3694,20 @@ static void vtd_pasid_cache_sync(IntelIOMMUState *s,
VTDPASIDCacheInfo *pc_info)
vtd_replay_guest_pasid_bindings(s, pc_info);
}
+static void vtd_pasid_cache_devsi(IntelIOMMUState *s,
+ PCIBus *bus, uint16_t devfn)
+{
+ VTDPASIDCacheInfo pc_info;
+
+ trace_vtd_pasid_cache_devsi(devfn);
+
+ pc_info.type = VTD_PASID_CACHE_DEVSI;
+ pc_info.bus = bus;
+ pc_info.devfn = devfn;
+
+ vtd_pasid_cache_sync(s, &pc_info);
+}
+
static bool vtd_process_pasid_desc(IntelIOMMUState *s,
VTDInvDesc *inv_desc)
{
diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index c87e59554d..9af073d843 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -583,6 +583,8 @@ typedef enum VTDPCInvType {
/* Reset all PASID cache entries, used in system level reset */
VTD_PASID_CACHE_FORCE_RESET = 0x10,
+ /* Invalidate all PASID entries in a device */
+ VTD_PASID_CACHE_DEVSI,
} VTDPCInvType;
typedef struct VTDPASIDCacheInfo {
diff --git a/hw/i386/trace-events b/hw/i386/trace-events
index 1c31b9a873..830b11f68b 100644
--- a/hw/i386/trace-events
+++ b/hw/i386/trace-events
@@ -28,6 +28,7 @@ vtd_pasid_cache_reset(void) ""
vtd_pasid_cache_gsi(void) ""
vtd_pasid_cache_dsi(uint16_t domain) "Domain selective PC invalidation domain
0x%"PRIx16
vtd_pasid_cache_psi(uint16_t domain, uint32_t pasid) "PASID selective PC
invalidation domain 0x%"PRIx16" pasid 0x%"PRIx32
+vtd_pasid_cache_devsi(uint16_t devfn) "Dev selective PC invalidation dev:
0x%"PRIx16
vtd_re_not_present(uint8_t bus) "Root entry bus %"PRIu8" not present"
vtd_ce_not_present(uint8_t bus, uint8_t devfn) "Context entry bus %"PRIu8"
devfn %"PRIu8" not present"
vtd_iotlb_page_hit(uint16_t sid, uint64_t addr, uint64_t slpte, uint16_t
domain) "IOTLB page hit sid 0x%"PRIx16" iova 0x%"PRIx64" slpte 0x%"PRIx64"
domain 0x%"PRIx16
--
2.47.1
