linux-kernel - [PATCH] KVM: nVMX: Fix L2 fails to boot due to VM entry with invalid control field

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Date:   Wed, 15 Feb 2017 03:10:58 -0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: [PATCH] KVM: nVMX: Fix L2 fails to boot due to VM entry with invalid control field

From: Wanpeng Li <wanpeng.li@...mail.com>

When I run kvm-unit-tests/vmx.flat in L1, The L2 fails to boot due to VM 
entry with invalid control field.

KVM: entry failed, hardware error 0x7
EAX=00000000 EBX=00000000 ECX=00000000 EDX=000306c3
ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
EIP=0000fff0 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 00000000 0000ffff 00009300
CS =f000 ffff0000 0000ffff 00009b00
SS =0000 00000000 0000ffff 00009300
DS =0000 00000000 0000ffff 00009300
FS =0000 00000000 0000ffff 00009300
GS =0000 00000000 0000ffff 00009300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 0000ffff
IDT=     00000000 0000ffff
CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000

nested_get_vmcs12_pages() fails to set VIRTUAL_APIC_PAGE_ADDR field in 
vmcs02 even if acquires a virtual apic page. This patch fixes it by 
setting VIRTUAL_APIC_PAGE_ADDR field in vmcs02 once acquires a virtual 
apic page.

Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
---
 arch/x86/kvm/vmx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 204d6e6..650f3433 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -9685,7 +9685,7 @@ static void nested_get_vmcs12_pages(struct kvm_vcpu *vcpu,
 		 * control.  But such a configuration is useless, so
 		 * let's keep the code simple.
 		 */
-		if (!vmx->nested.virtual_apic_page) {
+		if (vmx->nested.virtual_apic_page) {
 			hpa = page_to_phys(vmx->nested.virtual_apic_page);
 			vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, hpa);
 		}
-- 
2.7.4