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[v2,7/8] KVM: VMX: Use arch_xchg() when processing PIR to avoid instrumentation

Message ID 20250401163447.846608-8-seanjc@google.com (mailing list archive)
State New
Headers show
Series x86/irq: KVM: Optimize KVM's PIR harvesting | expand

Commit Message

Sean Christopherson April 1, 2025, 4:34 p.m. UTC 
Use arch_xchg() when moving IRQs from the PIR to the vIRR, purely to avoid
instrumentation so that KVM is compatible with the needs of posted MSI.
This will allow extracting the core PIR logic to common code and sharing
it between KVM and posted MSI handling.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/lapic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 0463e89376fb..13363327ad87 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -678,7 +678,7 @@  bool __kvm_apic_update_irr(unsigned long *pir, void *regs, int *max_irr)
 		if (!pir_vals[i])
 			continue;
 
-		pir_vals[i] = xchg(&pir[i], 0);
+		pir_vals[i] = arch_xchg(&pir[i], 0);
 	}
 
 	for (i = vec = 0; i <= 7; i++, vec += 32) {