linux-kernel - [PATCH] KVM: nVMX: Reset nested_run_pending if the CPU is going to be reset

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Date:   Fri,  3 Mar 2017 20:03:32 -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>,
        Wanpeng Li <wanpeng.li@...mail.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: [PATCH] KVM: nVMX: Reset nested_run_pending if the CPU is going to be reset

Reported by syzkaller:

	WARNING: CPU: 1 PID: 27742 at arch/x86/kvm/vmx.c:11029
	nested_vmx_vmexit+0x5c35/0x74d0 arch/x86/kvm/vmx.c:11029
	CPU: 1 PID: 27742 Comm: a.out Not tainted 4.10.0+ #229
	Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
	Call Trace:
	 __dump_stack lib/dump_stack.c:15 [inline]
	 dump_stack+0x2ee/0x3ef lib/dump_stack.c:51
	 panic+0x1fb/0x412 kernel/panic.c:179
	 __warn+0x1c4/0x1e0 kernel/panic.c:540
	 warn_slowpath_null+0x2c/0x40 kernel/panic.c:583
	 nested_vmx_vmexit+0x5c35/0x74d0 arch/x86/kvm/vmx.c:11029
	 vmx_leave_nested arch/x86/kvm/vmx.c:11136 [inline]
	 vmx_set_msr+0x1565/0x1910 arch/x86/kvm/vmx.c:3324
	 kvm_set_msr+0xd4/0x170 arch/x86/kvm/x86.c:1099
	 do_set_msr+0x11e/0x190 arch/x86/kvm/x86.c:1128
	 __msr_io arch/x86/kvm/x86.c:2577 [inline]
	 msr_io+0x24b/0x450 arch/x86/kvm/x86.c:2614
	 kvm_arch_vcpu_ioctl+0x35b/0x46a0 arch/x86/kvm/x86.c:3497
	 kvm_vcpu_ioctl+0x232/0x1120 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2721
	 vfs_ioctl fs/ioctl.c:43 [inline]
	 do_vfs_ioctl+0x1bf/0x1790 fs/ioctl.c:683
	 SYSC_ioctl fs/ioctl.c:698 [inline]
	 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:689
	 entry_SYSCALL_64_fastpath+0x1f/0xc2
	
The syzkaller folks reported a nested_run_pending warning during userspace clear VMX 
capability which is exposed to L1 before. 

The warning gets thrown while doing

(*(uint32_t*)0x20aecfe8 = (uint32_t)0x1);
(*(uint32_t*)0x20aecfec = (uint32_t)0x0);
(*(uint32_t*)0x20aecff0 = (uint32_t)0x3a);
(*(uint32_t*)0x20aecff4 = (uint32_t)0x0);
(*(uint64_t*)0x20aecff8 = (uint64_t)0x0);
r[29] = syscall(__NR_ioctl, r[4], 0x4008ae89ul,
		0x20aecfe8ul, 0, 0, 0, 0, 0, 0);

i.e. KVM_SET_MSR ioctl with

struct kvm_msrs {
	.nmsrs = 1,
		.pad = 0,
		.entries = {
			{.index = MSR_IA32_FEATURE_CONTROL,
				.reserved = 0,
				.data = 0}
		}
}

The VMLANCH/VMRESUME emulation should be stopped since the CPU is going to reset here. 
This patch resets the nested_run_pending since the CPU is going to be reset hence there 
should be nothing pending.

Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
Suggested-by: Radim Krčmář <rkrcmar@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
---
 arch/x86/kvm/vmx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 283aa86..b4a757369 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3310,8 +3310,10 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 		     FEATURE_CONTROL_LOCKED && !msr_info->host_initiated))
 			return 1;
 		vmx->msr_ia32_feature_control = data;
-		if (msr_info->host_initiated && data == 0)
+		if (msr_info->host_initiated && data == 0) {
+			vmx->nested.nested_run_pending = 0;
 			vmx_leave_nested(vcpu);
+		}
 		break;
 	case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
 		if (!msr_info->host_initiated)
-- 
2.7.4