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Subject[RFC PATCH 13/13] KVM: SVM: Use fastpath x2apic IPI emulation when #vmexit with x2AVIC
Date
When sends IPI to a halting vCPU, the hardware generates
avic_incomplete_ipi #vmexit with the
AVIC_IPI_FAILURE_TARGET_NOT_RUNNING reason.

For x2AVIC, enable fastpath emulation.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
arch/x86/kvm/svm/avic.c | 2 ++
arch/x86/kvm/x86.c | 3 ++-
arch/x86/kvm/x86.h | 1 +
3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 874c89f8fd47..758a79ee7f99 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -428,6 +428,8 @@ int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu)
kvm_lapic_reg_write(apic, APIC_ICR, icrl);
break;
case AVIC_IPI_FAILURE_TARGET_NOT_RUNNING:
+ handle_fastpath_set_x2apic_icr_irqoff(vcpu, svm->vmcb->control.exit_info_1);
+
/*
* At this point, we expect that the AVIC HW has already
* set the appropriate IRR bits on the valid target
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 641044db415d..c293027c7c10 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2008,7 +2008,7 @@ static inline bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu)
* from guest to host, e.g. reacquiring KVM's SRCU lock. In contrast to the
* other cases which must be called after interrupts are enabled on the host.
*/
-static int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data)
+int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data)
{
if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(vcpu->arch.apic))
return 1;
@@ -2028,6 +2028,7 @@ static int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data

return 1;
}
+EXPORT_SYMBOL_GPL(handle_fastpath_set_x2apic_icr_irqoff);

static int handle_fastpath_set_tscdeadline(struct kvm_vcpu *vcpu, u64 data)
{
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 767ec7f99516..035d20f83ca6 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -286,6 +286,7 @@ int x86_decode_emulated_instruction(struct kvm_vcpu *vcpu, int emulation_type,
int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
int emulation_type, void *insn, int insn_len);
fastpath_t handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vcpu);
+int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data);

extern u64 host_xcr0;
extern u64 supported_xcr0;
--
2.25.1
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