* [PATCH v3] KVM: nVMX: Fix pending events injection
@ 2017-02-27 12:24 Wanpeng Li
2017-03-01 16:25 ` Radim Krčmář
0 siblings, 1 reply; 3+ messages in thread
From: Wanpeng Li @ 2017-02-27 12:24 UTC (permalink / raw)
To: linux-kernel, kvm
Cc: Paolo Bonzini, Radim Krčmář, Wanpeng Li, Jan Kiszka
From: Wanpeng Li <wanpeng.li@hotmail.com>
L2 fails to boot on a non-APICv box dues to 'commit 0ad3bed6c5ec
("kvm: nVMX: move nested events check to kvm_vcpu_running")'
KVM internal error. Suberror: 3
extra data[0]: 800000ef
extra data[1]: 1
RAX=0000000000000000 RBX=ffffffff81f36140 RCX=0000000000000000 RDX=0000000000000000
RSI=0000000000000000 RDI=0000000000000000 RBP=ffff88007c92fe90 RSP=ffff88007c92fe90
R8 =ffff88007fccdca0 R9 =0000000000000000 R10=00000000fffedb3d R11=0000000000000000
R12=0000000000000003 R13=0000000000000000 R14=0000000000000000 R15=ffff88007c92c000
RIP=ffffffff810645e6 RFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 0000000000000000 ffffffff 00c00000
CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA]
SS =0000 0000000000000000 ffffffff 00c00000
DS =0000 0000000000000000 ffffffff 00c00000
FS =0000 0000000000000000 ffffffff 00c00000
GS =0000 ffff88007fcc0000 ffffffff 00c00000
LDT=0000 0000000000000000 ffffffff 00c00000
TR =0040 ffff88007fcd4200 00002087 00008b00 DPL=0 TSS64-busy
GDT= ffff88007fcc9000 0000007f
IDT= ffffffffff578000 00000fff
CR0=80050033 CR2=00000000ffffffff CR3=0000000001e0a000 CR4=003406e0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
DR6=00000000fffe0ff0 DR7=0000000000000400
EFER=0000000000000d01
We should try to reinject previous events if any before trying to inject
new event if pending. If vmexit is triggered by L2 guest and L0 interested
in, we should reinject IDT-vectoring info to L2 through vmcs02 if any,
otherwise, we can consider new IRQs/NMIs which can be injected and call
nested events callback to switch from L2 to L1 if needed and inject the
proper vmexit events. However, 'commit 0ad3bed6c5ec ("kvm: nVMX: move
nested events check to kvm_vcpu_running")' results in the handle events
order reversely on non-APICv box. This patch fixes it by bailing out for
pending events and not consider new events in this scenario.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
---
v2 -> v3:
* remove the duplicate check for vcpu->arch.interrupt.pending
v1 -> v2:
* bail out for pending events in vmx_check_nested_events() and not consider
new events in this scenario
arch/x86/kvm/vmx.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index ef4ba71..246a910 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -10642,6 +10642,11 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
+ if (vcpu->arch.exception.pending ||
+ vcpu->arch.nmi_injected ||
+ vcpu->arch.interrupt.pending)
+ return -EBUSY;
+
if (nested_cpu_has_preemption_timer(get_vmcs12(vcpu)) &&
vmx->nested.preemption_timer_expired) {
if (vmx->nested.nested_run_pending)
@@ -10651,8 +10656,7 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
}
if (vcpu->arch.nmi_pending && nested_exit_on_nmi(vcpu)) {
- if (vmx->nested.nested_run_pending ||
- vcpu->arch.interrupt.pending)
+ if (vmx->nested.nested_run_pending)
return -EBUSY;
nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
NMI_VECTOR | INTR_TYPE_NMI_INTR |
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v3] KVM: nVMX: Fix pending events injection
2017-02-27 12:24 [PATCH v3] KVM: nVMX: Fix pending events injection Wanpeng Li
@ 2017-03-01 16:25 ` Radim Krčmář
2017-03-02 1:18 ` Wanpeng Li
0 siblings, 1 reply; 3+ messages in thread
From: Radim Krčmář @ 2017-03-01 16:25 UTC (permalink / raw)
To: Wanpeng Li; +Cc: linux-kernel, kvm, Paolo Bonzini, Wanpeng Li, Jan Kiszka
2017-02-27 04:24-0800, Wanpeng Li:
> From: Wanpeng Li <wanpeng.li@hotmail.com>
>
> L2 fails to boot on a non-APICv box dues to 'commit 0ad3bed6c5ec
> ("kvm: nVMX: move nested events check to kvm_vcpu_running")'
Applied to kvm/queue for the time being, thanks.
This patch fixes also nested apic kvm-unit-test on APICv boxes.
With this patch, the test finishes without a suberror, but fails the
"multiple nmi" subtest. The subtest passes after reverting the whole
series that included 0ad3bed6c5ec.
We'll need to do more (something else?), but I haven't looked what
exactly, yet.
> KVM internal error. Suberror: 3
> extra data[0]: 800000ef
> extra data[1]: 1
> RAX=0000000000000000 RBX=ffffffff81f36140 RCX=0000000000000000 RDX=0000000000000000
> RSI=0000000000000000 RDI=0000000000000000 RBP=ffff88007c92fe90 RSP=ffff88007c92fe90
> R8 =ffff88007fccdca0 R9 =0000000000000000 R10=00000000fffedb3d R11=0000000000000000
> R12=0000000000000003 R13=0000000000000000 R14=0000000000000000 R15=ffff88007c92c000
> RIP=ffffffff810645e6 RFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
> ES =0000 0000000000000000 ffffffff 00c00000
> CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA]
> SS =0000 0000000000000000 ffffffff 00c00000
> DS =0000 0000000000000000 ffffffff 00c00000
> FS =0000 0000000000000000 ffffffff 00c00000
> GS =0000 ffff88007fcc0000 ffffffff 00c00000
> LDT=0000 0000000000000000 ffffffff 00c00000
> TR =0040 ffff88007fcd4200 00002087 00008b00 DPL=0 TSS64-busy
> GDT= ffff88007fcc9000 0000007f
> IDT= ffffffffff578000 00000fff
> CR0=80050033 CR2=00000000ffffffff CR3=0000000001e0a000 CR4=003406e0
> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
> DR6=00000000fffe0ff0 DR7=0000000000000400
> EFER=0000000000000d01
>
> We should try to reinject previous events if any before trying to inject
> new event if pending. If vmexit is triggered by L2 guest and L0 interested
> in, we should reinject IDT-vectoring info to L2 through vmcs02 if any,
> otherwise, we can consider new IRQs/NMIs which can be injected and call
> nested events callback to switch from L2 to L1 if needed and inject the
> proper vmexit events. However, 'commit 0ad3bed6c5ec ("kvm: nVMX: move
> nested events check to kvm_vcpu_running")' results in the handle events
> order reversely on non-APICv box. This patch fixes it by bailing out for
> pending events and not consider new events in this scenario.
>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Radim Krčmář <rkrcmar@redhat.com>
> Cc: Jan Kiszka <jan.kiszka@siemens.com>
> Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
> ---
> v2 -> v3:
> * remove the duplicate check for vcpu->arch.interrupt.pending
> v1 -> v2:
> * bail out for pending events in vmx_check_nested_events() and not consider
> new events in this scenario
>
> arch/x86/kvm/vmx.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index ef4ba71..246a910 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -10642,6 +10642,11 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
> {
> struct vcpu_vmx *vmx = to_vmx(vcpu);
>
> + if (vcpu->arch.exception.pending ||
> + vcpu->arch.nmi_injected ||
> + vcpu->arch.interrupt.pending)
> + return -EBUSY;
> +
> if (nested_cpu_has_preemption_timer(get_vmcs12(vcpu)) &&
> vmx->nested.preemption_timer_expired) {
> if (vmx->nested.nested_run_pending)
> @@ -10651,8 +10656,7 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
> }
>
> if (vcpu->arch.nmi_pending && nested_exit_on_nmi(vcpu)) {
> - if (vmx->nested.nested_run_pending ||
> - vcpu->arch.interrupt.pending)
> + if (vmx->nested.nested_run_pending)
> return -EBUSY;
> nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
> NMI_VECTOR | INTR_TYPE_NMI_INTR |
> --
> 2.7.4
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v3] KVM: nVMX: Fix pending events injection
2017-03-01 16:25 ` Radim Krčmář
@ 2017-03-02 1:18 ` Wanpeng Li
0 siblings, 0 replies; 3+ messages in thread
From: Wanpeng Li @ 2017-03-02 1:18 UTC (permalink / raw)
To: Radim Krčmář
Cc: linux-kernel, kvm, Paolo Bonzini, Wanpeng Li, Jan Kiszka
2017-03-02 0:25 GMT+08:00 Radim Krčmář <rkrcmar@redhat.com>:
> 2017-02-27 04:24-0800, Wanpeng Li:
>> From: Wanpeng Li <wanpeng.li@hotmail.com>
>>
>> L2 fails to boot on a non-APICv box dues to 'commit 0ad3bed6c5ec
>> ("kvm: nVMX: move nested events check to kvm_vcpu_running")'
>
> Applied to kvm/queue for the time being, thanks.
Yeah, the patch is good to catch the merge window, I will figure out
the "multiple nmi" failure later.
Regards,
Wanpeng Li
^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-02-27 12:24 [PATCH v3] KVM: nVMX: Fix pending events injection Wanpeng Li
2017-03-01 16:25 ` Radim Krčmář
2017-03-02 1:18 ` Wanpeng Li
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