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iommu/amd: Add support for Guest IO protection

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AMD IOMMU introduces support for Guest I/O protection where the request
from the I/O device without a PASID are treated as if they have PASID 0.

Co-developed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220825063939.8360-8-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Suravee Suthikulpanit 2022-08-25 06:39:37 +00:00 committed by Joerg Roedel
parent aaac38f614
commit 643feb0072
3 changed files with 19 additions and 0 deletions
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3
drivers/iommu/amd/amd_iommu_types.h
View file

@ -94,6 +94,7 @@
#define FEATURE_HE (1ULL<<8)
#define FEATURE_PC (1ULL<<9)
#define FEATURE_GAM_VAPIC (1ULL<<21)
#define FEATURE_GIOSUP (1ULL<<48)
#define FEATURE_EPHSUP (1ULL<<50)
#define FEATURE_SNP (1ULL<<63)
@ -378,6 +379,7 @@
#define DTE_FLAG_IW (1ULL << 62)
#define DTE_FLAG_IOTLB (1ULL << 32)
#define DTE_FLAG_GIOV (1ULL << 54)
#define DTE_FLAG_GV (1ULL << 55)
#define DTE_FLAG_MASK (0x3ffULL << 32)
#define DTE_GLX_SHIFT (56)
@ -436,6 +438,7 @@
#define PD_PASSTHROUGH_MASK (1UL << 2) /* domain has no page
translation */
#define PD_IOMMUV2_MASK (1UL << 3) /* domain has gcr3 table */
#define PD_GIOV_MASK (1UL << 4) /* domain enable GIOV support */
extern bool amd_iommu_dump;
#define DUMP_printk(format, arg...) \

13
drivers/iommu/amd/init.c
View file

@ -2068,6 +2068,17 @@ static int __init iommu_init_pci(struct amd_iommu *iommu)
init_iommu_perf_ctr(iommu);
if (amd_iommu_pgtable == AMD_IOMMU_V2) {
if (!iommu_feature(iommu, FEATURE_GIOSUP) ||
!iommu_feature(iommu, FEATURE_GT)) {
pr_warn("Cannot enable v2 page table for DMA-API. Fallback to v1.\n");
amd_iommu_pgtable = AMD_IOMMU_V1;
} else if (iommu_default_passthrough()) {
pr_warn("V2 page table doesn't support passthrough mode. Fallback to v1.\n");
amd_iommu_pgtable = AMD_IOMMU_V1;
}
}
if (is_rd890_iommu(iommu->dev)) {
int i, j;
@ -2146,6 +2157,8 @@ static void print_iommu_info(void)
if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
pr_info("X2APIC enabled\n");
}
if (amd_iommu_pgtable == AMD_IOMMU_V2)
pr_info("V2 page table enabled\n");
}
static int __init amd_iommu_init_pci(void)

3
drivers/iommu/amd/iommu.c
View file

@ -1597,6 +1597,9 @@ static void set_dte_entry(struct amd_iommu *iommu, u16 devid,
tmp = DTE_GCR3_VAL_C(gcr3) << DTE_GCR3_SHIFT_C;
flags |= tmp;
if (domain->flags & PD_GIOV_MASK)
pte_root |= DTE_FLAG_GIOV;
}
flags &= ~DEV_DOMID_MASK;