From: Maxim Levitsky <mlevitsk@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>, kvm@vger.kernel.org
Cc: Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<linux-kernel@vger.kernel.org>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Sean Christopherson <sean.j.christopherson@intel.com>
Subject: Re: [PATCH 5/8] KVM: nSVM: implement ondemand allocation of the nested state
Date: Thu, 20 Aug 2020 13:02:15 +0300 [thread overview]
Message-ID: <faedeeb06b63a115a1ab733b1226ae6822d2a907.camel@redhat.com> (raw)
In-Reply-To: <476eecc8-a861-203c-40f5-46707d8c0237@redhat.com>
On Thu, 2020-08-20 at 11:58 +0200, Paolo Bonzini wrote:
> On 20/08/20 11:13, Maxim Levitsky wrote:
> > @@ -3912,6 +3914,14 @@ static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
> > vmcb_gpa = GET_SMSTATE(u64, smstate, 0x7ee0);
> >
> > if (guest) {
> > + /*
> > + * This can happen if SVM was not enabled prior to #SMI,
> > + * but guest corrupted the #SMI state and marked it as
> > + * enabled it there
> > + */
> > + if (!svm->nested.initialized)
> > + return 1;
> > +
> > if (kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map) == -EINVAL)
> > return 1;
>
> This can also happen if you live migrate while in SMM (EFER.SVME=0).
> You need to check for the SVME bit in the SMM state save area, and:
>
> 1) triple fault if it is clear
>
> 2) call svm_allocate_nested if it is set.
>
> Paolo
>
Makes sense, will do.
Best regards,
Maxim Levitsky
next prev parent reply other threads:[~2020-08-20 11:56 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-20 9:13 [PATCH 0/8] KVM: nSVM: ondemand nested state allocation + nested guest state caching Maxim Levitsky
2020-08-20 9:13 ` [PATCH 1/8] KVM: SVM: rename a variable in the svm_create_vcpu Maxim Levitsky
2020-08-20 9:13 ` [PATCH 2/8] KVM: nSVM: rename nested 'vmcb' to vmcb_gpa in few places Maxim Levitsky
2020-08-20 9:56 ` Paolo Bonzini
2020-08-20 10:00 ` Maxim Levitsky
2020-08-20 10:19 ` Paolo Bonzini
2020-08-20 10:23 ` Maxim Levitsky
2020-08-20 10:56 ` Paolo Bonzini
2020-08-20 11:52 ` Maxim Levitsky
2020-08-20 9:13 ` [PATCH 3/8] KVM: SVM: refactor msr permission bitmap allocation Maxim Levitsky
2020-08-20 9:13 ` [PATCH 4/8] KVM: x86: allow kvm_x86_ops.set_efer to return a value Maxim Levitsky
2020-08-20 9:13 ` [PATCH 5/8] KVM: nSVM: implement ondemand allocation of the nested state Maxim Levitsky
2020-08-20 9:58 ` Paolo Bonzini
2020-08-20 10:02 ` Maxim Levitsky [this message]
2020-08-20 9:13 ` [PATCH 6/8] SVM: nSVM: cache whole nested vmcb instead of only its control area Maxim Levitsky
2020-08-20 9:13 ` [PATCH 7/8] KVM: nSVM: implement caching of nested vmcb save area Maxim Levitsky
2020-08-20 9:13 ` [PATCH 8/8] KVM: nSVM: read only changed fields of the nested guest data area Maxim Levitsky
2020-08-20 9:55 ` Paolo Bonzini
2020-08-20 9:57 ` Maxim Levitsky
2020-08-20 10:01 ` Paolo Bonzini
2020-08-20 10:05 ` Maxim Levitsky
2020-08-20 10:18 ` Paolo Bonzini
2020-08-20 10:26 ` Maxim Levitsky
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