diff options
| author | Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2022-07-26 08:43:48 -0500 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2022-07-29 10:31:06 +0200 |
| commit | 432e5dfc7eb75681b412c2b0cafb8604475e0aba (patch) | |
| tree | 33d5b75312a3017803671a5a74afa352326c4d56 /drivers/iommu/amd/init.c | |
| parent | c5e1a1eb9279fdb28d47ca2a4493a4c53b7d6a0b (diff) | |
iommu/amd: Add support for AVIC when SNP is enabled
In order to support AVIC on SNP-enabled system, The IOMMU driver needs to
check EFR2[SNPAVICSup] and enables the support by setting SNPAVICEn bit
in the IOMMU control register (MMIO offset 18h).
For detail, please see section "SEV-SNP Guest Virtual APIC Support" of the
AMD I/O Virtualization Technology (IOMMU) Specification.
(https://www.amd.com/system/files/TechDocs/48882_IOMMU.pdf)
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Link: https://lore.kernel.org/r/20220726134348.6438-3-suravee.suthikulpanit@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd/init.c')
| -rw-r--r-- | drivers/iommu/amd/init.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c index 4cd94d716122..6bbaf6b971e8 100644 --- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -2794,13 +2794,22 @@ static void enable_iommus_vapic(void) return; } - /* Enabling GAM support */ + if (amd_iommu_snp_en && + !FEATURE_SNPAVICSUP_GAM(amd_iommu_efr2)) { + pr_warn("Force to disable Virtual APIC due to SNP\n"); + amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA; + return; + } + + /* Enabling GAM and SNPAVIC support */ for_each_iommu(iommu) { if (iommu_init_ga_log(iommu) || iommu_ga_log_enable(iommu)) return; iommu_feature_enable(iommu, CONTROL_GAM_EN); + if (amd_iommu_snp_en) + iommu_feature_enable(iommu, CONTROL_SNPAVIC_EN); } amd_iommu_irq_ops.capability |= (1 << IRQ_POSTING_CAP); |