diff options
| author | Sean Christopherson <seanjc@google.com> | 2025-06-11 15:45:24 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-06-23 09:50:24 -0700 |
| commit | c4cdbaf9d81c8387da8b9b91567d4b0eb1b8a549 (patch) | |
| tree | cd43591a9d70e62a7eed4e61c23fa4238048eb1c /arch/x86/kvm/svm/avic.c | |
| parent | 52d826c9e54cc6b4f0107720dd1f254944f6e727 (diff) | |
iommu/amd: KVM: SVM: Use pi_desc_addr to derive ga_root_ptr
Use vcpu_data.pi_desc_addr instead of amd_iommu_pi_data.base to get the
GA root pointer. KVM is the only source of amd_iommu_pi_data.base, and
KVM's one and only path for writing amd_iommu_pi_data.base computes the
exact same value for vcpu_data.pi_desc_addr and amd_iommu_pi_data.base,
and fills amd_iommu_pi_data.base if and only if vcpu_data.pi_desc_addr is
valid, i.e. amd_iommu_pi_data.base is fully redundant.
Cc: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Tested-by: Sairaj Kodilkar <sarunkod@amd.com>
Link: https://lore.kernel.org/r/20250611224604.313496-23-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/svm/avic.c')
| -rw-r--r-- | arch/x86/kvm/svm/avic.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index 375a29022000..d95742faae11 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -894,8 +894,11 @@ int avic_pi_update_irte(struct kvm_kernel_irqfd *irqfd, struct kvm *kvm, enable_remapped_mode = false; - /* Try to enable guest_mode in IRTE */ - pi.base = avic_get_backing_page_address(svm); + /* + * Try to enable guest_mode in IRTE. Note, the address + * of the vCPU's AVIC backing page is passed to the + * IOMMU via vcpu_info->pi_desc_addr. + */ pi.ga_tag = AVIC_GATAG(to_kvm_svm(kvm)->avic_vm_id, svm->vcpu.vcpu_id); pi.is_guest_mode = true; |