diff options
| author |   Sean Christopherson <seanjc@google.com> | 2025-04-01 09:18:03 -0700 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2025-04-24 09:52:31 -0400 |
| commit | 6560aff981ada9aec8163509a59d8f48283263d6 (patch) | |
| tree | 29f7d61917b559a149dba3a22997a7a8cef86f08 | |
| parent | KVM: arm64, x86: make kvm_arch_has_irq_bypass() inline (diff) | |
| download | wireguard-linux-6560aff981ada9aec8163509a59d8f48283263d6.tar.xz wireguard-linux-6560aff981ada9aec8163509a59d8f48283263d6.zip | |
KVM: SVM: Don't update IRTEs if APICv/AVIC is disabled
Skip IRTE updates if AVIC is disabled/unsupported, as forcing the IRTE
into remapped mode (kvm_vcpu_apicv_active() will never be true) is
unnecessary and wasteful. The IOMMU driver is responsible for putting
IRTEs into remapped mode when an IRQ is allocated by a device, long before
that device is assigned to a VM. I.e. the kernel as a whole has major
issues if the IRTE isn't already in remapped mode.
Opportunsitically kvm_arch_has_irq_bypass() to query for APICv/AVIC, so
so that all checks in KVM x86 incorporate the same information.
Cc: Yosry Ahmed <yosry.ahmed@linux.dev>
Cc: Jim Mattson <jmattson@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20250401161804.842968-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kvm/svm/avic.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index 65fd245a9953..901d8d2dc169 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -898,8 +898,7 @@ int avic_pi_update_irte(struct kvm *kvm, unsigned int host_irq, struct kvm_irq_routing_table *irq_rt; int idx, ret = 0; - if (!kvm_arch_has_assigned_device(kvm) || - !irq_remapping_cap(IRQ_POSTING_CAP)) + if (!kvm_arch_has_assigned_device(kvm) || !kvm_arch_has_irq_bypass()) return 0; pr_debug("SVM: %s: host_irq=%#x, guest_irq=%#x, set=%#x\n", |