diff options
| author | Liu Yi L <yi.l.liu@intel.com> | 2020-07-04 01:07:15 -0700 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-07-22 07:57:07 -0400 |
| commit | a4544c45e109ceee87ee8c19baff28be3890d788 (patch) | |
| tree | f5b5eb70e2da31fefede2ccf6e738dfc77bf0af7 /hw | |
| parent | 9b3a35ec8236933ab958a4c3ad883163f1ca66e7 (diff) | |
intel_iommu: Use correct shift for 256 bits qi descriptor
In chapter 10.4.23 of VT-d spec 3.0, Descriptor Width bit was introduced
in VTD_IQA_REG. Software could set this bit to tell VT-d the QI descriptor
from software would be 256 bits. Accordingly, the VTD_IQH_QH_SHIFT should
be 5 when descriptor size is 256 bits.
This patch adds the DW bit check when deciding the shift used to update
VTD_IQH_REG.
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Message-Id: <1593850035-35483-1-git-send-email-yi.l.liu@intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/i386/intel_iommu.c | 7 | ||||
| -rw-r--r-- | hw/i386/intel_iommu_internal.h | 3 |
2 files changed, 8 insertions, 2 deletions
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index c56398e991..0c286635cf 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -2549,6 +2549,11 @@ static bool vtd_process_inv_desc(IntelIOMMUState *s) /* Try to fetch and process more Invalidation Descriptors */ static void vtd_fetch_inv_desc(IntelIOMMUState *s) { + int qi_shift; + + /* Refer to 10.4.23 of VT-d spec 3.0 */ + qi_shift = s->iq_dw ? VTD_IQH_QH_SHIFT_5 : VTD_IQH_QH_SHIFT_4; + trace_vtd_inv_qi_fetch(); if (s->iq_tail >= s->iq_size) { @@ -2567,7 +2572,7 @@ static void vtd_fetch_inv_desc(IntelIOMMUState *s) } /* Must update the IQH_REG in time */ vtd_set_quad_raw(s, DMAR_IQH_REG, - (((uint64_t)(s->iq_head)) << VTD_IQH_QH_SHIFT) & + (((uint64_t)(s->iq_head)) << qi_shift) & VTD_IQH_QH_MASK); } } diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h index 862033ebe6..3d5487fe2c 100644 --- a/hw/i386/intel_iommu_internal.h +++ b/hw/i386/intel_iommu_internal.h @@ -230,7 +230,8 @@ #define VTD_IQA_DW_MASK 0x800 /* IQH_REG */ -#define VTD_IQH_QH_SHIFT 4 +#define VTD_IQH_QH_SHIFT_4 4 +#define VTD_IQH_QH_SHIFT_5 5 #define VTD_IQH_QH_MASK 0x7fff0ULL /* ICS_REG */ |