Commit baf68a0e authored by Sean Christopherson's avatar Sean Christopherson
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KVM: VMX: Use arch_xchg() when processing PIR to avoid instrumentation 

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.

Link: https://lore.kernel.org/r/20250401163447.846608-8-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent b41f8638

arch/x86/kvm/lapic.c

+1 −1
Original line number Diff line number Diff line
@@ -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) {