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intel_iommu: Introduce a property to control FS1GP cap bit setting

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This gives user flexibility to turn off FS1GP for debug purpose.

It is also useful for future nesting feature. When host IOMMU doesn't
support FS1GP but vIOMMU does, nested page table on host side works
after turning FS1GP off in vIOMMU.

This property has no effect when vIOMMU is in legacy mode or x-flts=off
in scalable modme.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Clément Mathieu--Drif<clement.mathieu--drif@eviden.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20241212083757.605022-20-zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhenzhong Duan 2024-12-12 16:37:56 +08:00 committed by Michael S. Tsirkin
parent aa68a9fbdb
commit d9d32478ed
2 changed files with 5 additions and 1 deletions
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5
hw/i386/intel_iommu.c
View File

@ -3834,6 +3834,7 @@ static const Property vtd_properties[] = {
DEFINE_PROP_BOOL("dma-drain", IntelIOMMUState, dma_drain, true),
DEFINE_PROP_BOOL("dma-translation", IntelIOMMUState, dma_translation, true),
DEFINE_PROP_BOOL("stale-tm", IntelIOMMUState, stale_tm, false),
DEFINE_PROP_BOOL("fs1gp", IntelIOMMUState, fs1gp, true),
};
/* Read IRTE entry with specific index */
@ -4561,7 +4562,9 @@ static void vtd_cap_init(IntelIOMMUState *s)
/* TODO: read cap/ecap from host to decide which cap to be exposed. */
if (s->flts) {
s->ecap |= VTD_ECAP_SMTS | VTD_ECAP_FLTS;
s->cap |= VTD_CAP_FS1GP;
if (s->fs1gp) {
s->cap |= VTD_CAP_FS1GP;
}
} else if (s->scalable_mode) {
s->ecap |= VTD_ECAP_SMTS | VTD_ECAP_SRS | VTD_ECAP_SLTS;
}

1
include/hw/i386/intel_iommu.h
View File

@ -307,6 +307,7 @@ struct IntelIOMMUState {
bool dma_drain; /* Whether DMA r/w draining enabled */
bool dma_translation; /* Whether DMA translation supported */
bool pasid; /* Whether to support PASID */
bool fs1gp; /* First Stage 1-GByte Page Support */
/* Transient Mapping, Reserved(0) since VTD spec revision 3.2 */
bool stale_tm;