It seems that it's easy to implement the EOI assist
on top of the PV EOI feature: simply convert the
page address to the format expected by PV EOI.
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
Warning: untested! As I'll be off-line for a couple of days,
sending this out for early review.
Review/comments/flames/testing reports welcome.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8ae1ff5..d84d750fc 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1890,6 +1890,8 @@ static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
vcpu->arch.hv_vapic = data;
+ if (kvm_lapic_enable_pv_eoi(vcpu, 0))
+ return 1;
break;
}
gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
@@ -1900,6 +1902,8 @@ static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
return 1;
vcpu->arch.hv_vapic = data;
mark_page_dirty(vcpu->kvm, gfn);
+ if (kvm_lapic_enable_pv_eoi(vcpu, gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
+ return 1;
break;
}
case HV_X64_MSR_EOI:
--
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