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This is achieved by not setting the IPI vector > in SAVIC_ALLOWED_IRR in the Secure AVIC guest APIC Backing page. Due to > this, PV_SEND_IPI cannot work since it needs KVM to be able to inject > IPIs into the guest. Disable the same. Another guest patch... Does this have an impact on the hypervisor? Is the injected IPI just ignored because of the SAVIC_ALLOWED_IRR? How would the hypervisor know that it needs to schedule the target vCPU if not using this, a write to the ICR? Thanks, Tom > > On a related note, PV_EOI does not need to be disabled since the > behavior is exactly the same as AVIC: though it is advertised, KVM never > "enables" it since APICv is always enabled for Secure AVIC SEV-SNP > guests. > > Fixes: c4074ab87f34 ("x86/apic: Enable Secure AVIC in the control MSR") > Signed-off-by: Naveen N Rao (AMD) > --- > arch/x86/kernel/kvm.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 29226d112029..e2dad507f2a4 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/kvm.c > @@ -495,7 +495,8 @@ static bool pv_tlb_flush_supported(void) > static bool pv_ipi_supported(void) > { > return (kvm_para_has_feature(KVM_FEATURE_PV_SEND_IPI) && > - (num_possible_cpus() != 1)); > + (num_possible_cpus() != 1) && > + !cc_platform_has(CC_ATTR_SNP_SECURE_AVIC)); > } > > static bool pv_sched_yield_supported(void)