From: Tianyu Lan <ti...@microsoft.com> Secure AVIC is a new hardware feature in the AMD64 architecture to allow SEV-SNP guests to prevent the hypervisor from generating unexpected interrupts to a vCPU or otherwise violate architectural assumptions around APIC behavior.
Each vCPU has a guest-allocated APIC backing page of size 4K, which maintains APIC state for that vCPU. APIC backing page's ALLOWED_IRR field indicates the interrupt vectors which the guest allows the hypervisor to send. This patchset is to enable the feature for Hyper-V platform. Patch "Expose x2apic_savic_update_vector()" is to expose new fucntion and device driver and arch code may update AVIC backing page ALLOWED_IRR field to allow Hyper-V inject associated vector. This patchset is based on the AMD patchset "AMD: Add Secure AVIC Guest Support" https://lkml.org/lkml/2025/4/17/585 Tianyu Lan (6): x86/Hyper-V: Not use hv apic driver when Secure AVIC is available x86/x2apic-savic: Expose x2apic_savic_update_vector() drivers/hv: Allow vmbus message synic interrupt injected from Hyper-V x86/Hyper-V: Allow Hyper-V to inject Hyper-V vectors x86/Hyper-V: Not use auto-eoi when Secure AVIC is available x86/x2apic-savic: Not set APIC backing page if Secure AVIC is not enabled. arch/x86/hyperv/hv_apic.c | 3 +++ arch/x86/hyperv/hv_init.c | 12 ++++++++++++ arch/x86/include/asm/apic.h | 9 +++++++++ arch/x86/kernel/apic/x2apic_savic.c | 13 ++++++++++++- arch/x86/kernel/cpu/mshyperv.c | 3 +++ drivers/hv/hv.c | 2 ++ 6 files changed, 41 insertions(+), 1 deletion(-) -- 2.25.1
