[PATCH] KVM: vmx: disable posted interrupts if no local APIC

From	Paolo Bonzini <pbonzini@redhat.com>
Newsgroups	linux.kernel
Subject	[PATCH] KVM: vmx: disable posted interrupts if no local APIC
Date	2015-09-28 12:20 +0200
Message-ID	<qdDHj-2KC-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Uniprocessor 32-bit randconfigs can disable the local APIC, and posted
interrupts require reserving a vector on the LAPIC, so they are
incompatible.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/kvm/vmx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 64076740251e..0b84007ff01b 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -983,7 +983,8 @@ static inline bool cpu_has_vmx_virtual_intr_delivery(void)
 
 static inline bool cpu_has_vmx_posted_intr(void)
 {
-	return vmcs_config.pin_based_exec_ctrl & PIN_BASED_POSTED_INTR;
+	return IS_ENABLED(CONFIG_X86_LOCAL_APIC) &&
+		vmcs_config.pin_based_exec_ctrl & PIN_BASED_POSTED_INTR;
 }
 
 static inline bool cpu_has_vmx_apicv(void)
-- 
1.8.3.1

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[PATCH] KVM: vmx: disable posted interrupts if no local APIC Paolo Bonzini <pbonzini@redhat.com> - 2015-09-28 12:20 +0200

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