* [PATCH RESEND 1/3] KVM: SVM: Get rid of handle_fastpath_set_msr_irqoff()
@ 2020-09-09 2:57 Wanpeng Li
2020-09-09 2:57 ` [PATCH RESEND 2/3] KVM: SVM: Move svm_complete_interrupts() into svm_vcpu_run() Wanpeng Li
2020-09-09 2:57 ` [PATCH RESEND 3/3] KVM: SVM: Reenable handle_fastpath_set_msr_irqoff() after complete_interrupts() Wanpeng Li
0 siblings, 2 replies; 5+ messages in thread
From: Wanpeng Li @ 2020-09-09 2:57 UTC (permalink / raw)
To: linux-kernel, kvm
Cc: Paolo Bonzini, Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li,
Jim Mattson, Joerg Roedel, Paul K ., # v5 . 8-rc1+
From: Wanpeng Li <wanpengli@tencent.com>
Analysis from Sean:
| svm->next_rip is reset in svm_vcpu_run() only after calling
| svm_exit_handlers_fastpath(), which will cause SVM's
| skip_emulated_instruction() to write a stale RIP.
Let's get rid of handle_fastpath_set_msr_irqoff() in svm_exit_handlers_fastpath()
to have a quick fix.
Reported-by: Paul K. <kronenpj@kronenpj.dyndns.org>
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Paul K. <kronenpj@kronenpj.dyndns.org>
Cc: <stable@vger.kernel.org> # v5.8-rc1+
Fixes: 404d5d7bff0d (KVM: X86: Introduce more exit_fastpath_completion enum values)
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
arch/x86/kvm/svm/svm.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 19e622a..c61bc3b 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3349,11 +3349,6 @@ static void svm_cancel_injection(struct kvm_vcpu *vcpu)
static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
{
- if (!is_guest_mode(vcpu) &&
- to_svm(vcpu)->vmcb->control.exit_code == SVM_EXIT_MSR &&
- to_svm(vcpu)->vmcb->control.exit_info_1)
- return handle_fastpath_set_msr_irqoff(vcpu);
-
return EXIT_FASTPATH_NONE;
}
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH RESEND 2/3] KVM: SVM: Move svm_complete_interrupts() into svm_vcpu_run()
2020-09-09 2:57 [PATCH RESEND 1/3] KVM: SVM: Get rid of handle_fastpath_set_msr_irqoff() Wanpeng Li
@ 2020-09-09 2:57 ` Wanpeng Li
2020-09-09 2:57 ` [PATCH RESEND 3/3] KVM: SVM: Reenable handle_fastpath_set_msr_irqoff() after complete_interrupts() Wanpeng Li
1 sibling, 0 replies; 5+ messages in thread
From: Wanpeng Li @ 2020-09-09 2:57 UTC (permalink / raw)
To: linux-kernel, kvm
Cc: Paolo Bonzini, Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li,
Jim Mattson, Joerg Roedel, Paul K .
From: Wanpeng Li <wanpengli@tencent.com>
Moving svm_complete_interrupts() into svm_vcpu_run() which can align VMX
and SVM with respect to completing interrupts.
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Paul K. <kronenpj@kronenpj.dyndns.org>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
arch/x86/kvm/svm/svm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index c61bc3b..74bcf0a 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2938,8 +2938,6 @@ static int handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
if (npt_enabled)
vcpu->arch.cr3 = svm->vmcb->save.cr3;
- svm_complete_interrupts(svm);
-
if (is_guest_mode(vcpu)) {
int vmexit;
@@ -3530,6 +3528,8 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
SVM_EXIT_EXCP_BASE + MC_VECTOR))
svm_handle_mce(svm);
+ svm_complete_interrupts(svm);
+
vmcb_mark_all_clean(svm->vmcb);
return exit_fastpath;
}
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH RESEND 3/3] KVM: SVM: Reenable handle_fastpath_set_msr_irqoff() after complete_interrupts()
2020-09-09 2:57 [PATCH RESEND 1/3] KVM: SVM: Get rid of handle_fastpath_set_msr_irqoff() Wanpeng Li
2020-09-09 2:57 ` [PATCH RESEND 2/3] KVM: SVM: Move svm_complete_interrupts() into svm_vcpu_run() Wanpeng Li
@ 2020-09-09 2:57 ` Wanpeng Li
2020-09-12 6:15 ` Paolo Bonzini
1 sibling, 1 reply; 5+ messages in thread
From: Wanpeng Li @ 2020-09-09 2:57 UTC (permalink / raw)
To: linux-kernel, kvm
Cc: Paolo Bonzini, Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li,
Jim Mattson, Joerg Roedel, Paul K .
From: Wanpeng Li <wanpengli@tencent.com>
Moving the call to svm_exit_handlers_fastpath() after svm_complete_interrupts()
since svm_complete_interrupts() consumes rip and reenable the function
handle_fastpath_set_msr_irqoff() call in svm_exit_handlers_fastpath().
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Paul K. <kronenpj@kronenpj.dyndns.org>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
arch/x86/kvm/svm/svm.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 74bcf0a..ac819f0 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3347,6 +3347,11 @@ static void svm_cancel_injection(struct kvm_vcpu *vcpu)
static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
{
+ if (!is_guest_mode(vcpu) &&
+ to_svm(vcpu)->vmcb->control.exit_code == SVM_EXIT_MSR &&
+ to_svm(vcpu)->vmcb->control.exit_info_1)
+ return handle_fastpath_set_msr_irqoff(vcpu);
+
return EXIT_FASTPATH_NONE;
}
@@ -3495,7 +3500,6 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
stgi();
/* Any pending NMI will happen here */
- exit_fastpath = svm_exit_handlers_fastpath(vcpu);
if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
kvm_after_interrupt(&svm->vcpu);
@@ -3529,6 +3533,7 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
svm_handle_mce(svm);
svm_complete_interrupts(svm);
+ exit_fastpath = svm_exit_handlers_fastpath(vcpu);
vmcb_mark_all_clean(svm->vmcb);
return exit_fastpath;
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH RESEND 3/3] KVM: SVM: Reenable handle_fastpath_set_msr_irqoff() after complete_interrupts()
2020-09-09 2:57 ` [PATCH RESEND 3/3] KVM: SVM: Reenable handle_fastpath_set_msr_irqoff() after complete_interrupts() Wanpeng Li
@ 2020-09-12 6:15 ` Paolo Bonzini
2020-09-14 15:48 ` Sean Christopherson
0 siblings, 1 reply; 5+ messages in thread
From: Paolo Bonzini @ 2020-09-12 6:15 UTC (permalink / raw)
To: Wanpeng Li, linux-kernel, kvm
Cc: Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li, Jim Mattson,
Joerg Roedel, Paul K .
The overall patch is fairly simple:
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 03dd7bac8034..d6ce75e107c0 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2938,8 +2938,6 @@ static int handle_exit(struct kvm_vcpu *vcpu,
fastpath_t exit_fastpath)
if (npt_enabled)
vcpu->arch.cr3 = svm->vmcb->save.cr3;
- svm_complete_interrupts(svm);
-
if (is_guest_mode(vcpu)) {
int vmexit;
@@ -3504,7 +3502,6 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct
kvm_vcpu *vcpu)
stgi();
/* Any pending NMI will happen here */
- exit_fastpath = svm_exit_handlers_fastpath(vcpu);
if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
kvm_after_interrupt(&svm->vcpu);
@@ -3537,6 +3534,9 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct
kvm_vcpu *vcpu)
SVM_EXIT_EXCP_BASE + MC_VECTOR))
svm_handle_mce(svm);
+ svm_complete_interrupts(svm);
+ exit_fastpath = svm_exit_handlers_fastpath(vcpu);
+
vmcb_mark_all_clean(svm->vmcb);
return exit_fastpath;
}
so I will just squash everything.
Paolo
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH RESEND 3/3] KVM: SVM: Reenable handle_fastpath_set_msr_irqoff() after complete_interrupts()
2020-09-12 6:15 ` Paolo Bonzini
@ 2020-09-14 15:48 ` Sean Christopherson
0 siblings, 0 replies; 5+ messages in thread
From: Sean Christopherson @ 2020-09-14 15:48 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Wanpeng Li, linux-kernel, kvm, Vitaly Kuznetsov, Wanpeng Li,
Jim Mattson, Joerg Roedel, Paul K .
On Sat, Sep 12, 2020 at 08:15:46AM +0200, Paolo Bonzini wrote:
> The overall patch is fairly simple:
>
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index 03dd7bac8034..d6ce75e107c0 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -2938,8 +2938,6 @@ static int handle_exit(struct kvm_vcpu *vcpu,
> fastpath_t exit_fastpath)
> if (npt_enabled)
> vcpu->arch.cr3 = svm->vmcb->save.cr3;
>
> - svm_complete_interrupts(svm);
> -
> if (is_guest_mode(vcpu)) {
> int vmexit;
>
> @@ -3504,7 +3502,6 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct
> kvm_vcpu *vcpu)
> stgi();
>
> /* Any pending NMI will happen here */
> - exit_fastpath = svm_exit_handlers_fastpath(vcpu);
>
> if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
> kvm_after_interrupt(&svm->vcpu);
> @@ -3537,6 +3534,9 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct
> kvm_vcpu *vcpu)
> SVM_EXIT_EXCP_BASE + MC_VECTOR))
> svm_handle_mce(svm);
>
> + svm_complete_interrupts(svm);
> + exit_fastpath = svm_exit_handlers_fastpath(vcpu);
> +
> vmcb_mark_all_clean(svm->vmcb);
> return exit_fastpath;
> }
>
> so I will just squash everything.
The thought behind the multi-patch series was to allow automatically applying
the fix to the 5.8 stable tree without having to take on the risk of moving
svm_complete_interrupts().
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-09-14 15:53 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2020-09-09 2:57 [PATCH RESEND 1/3] KVM: SVM: Get rid of handle_fastpath_set_msr_irqoff() Wanpeng Li
2020-09-09 2:57 ` [PATCH RESEND 2/3] KVM: SVM: Move svm_complete_interrupts() into svm_vcpu_run() Wanpeng Li
2020-09-09 2:57 ` [PATCH RESEND 3/3] KVM: SVM: Reenable handle_fastpath_set_msr_irqoff() after complete_interrupts() Wanpeng Li
2020-09-12 6:15 ` Paolo Bonzini
2020-09-14 15:48 ` Sean Christopherson
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