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 "Drivers: hv: Allow vmbus message synic interrupt injected from Hyper-V" is to expose new fucntion hv_enable_coco_interrupt() 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/2025/6/10/1579 Change since v5: - Rmove extra line and move hv_enable_coco_interrupt() just after hv_set_msr() in the hv_synic_disable_regs(). Change since v4: - Change the order to call hv_enable_coco_interrupt() in the hv_synic_enable/disable_regs(). - Update commit title "Drivers/hv:" to "Drivers: hv:" Change since v3: - Disable VMBus Message interrupt via hv_enable_ coco_interrupt() in the hv_synic_disable_regs(). - Fix coding style issue and update change log. Change since v2: - Add hv_enable_coco_interrupt() as wrapper of apic_update_vector() - Re-work change logs Change since v1: - Remove the check of Secure AVIC when set APIC backing page - Use apic_update_vector() instead of exposing new interface from Secure AVIC driver to update APIC backing page and allow associated interrupt to be injected by hypervisor. Tianyu Lan (4): x86/hyperv: Don't use hv apic driver when Secure AVIC is available Drivers: hv: Allow vmbus message synic interrupt injected from Hyper-V x86/hyperv: Don't use auto-eoi when Secure AVIC is available x86/hyperv: Allow Hyper-V to inject STIMER0 interrupts arch/x86/hyperv/hv_apic.c | 9 +++++++++ arch/x86/hyperv/hv_init.c | 7 +++++++ arch/x86/kernel/cpu/mshyperv.c | 2 ++ drivers/hv/hv.c | 7 ++++++- drivers/hv/hv_common.c | 5 +++++ include/asm-generic/mshyperv.h | 1 + 6 files changed, 30 insertions(+), 1 deletion(-) -- 2.25.1
