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From: Naresh Kamboju <naresh.kamboju@linaro.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sasha Levin <sashal@kernel.org>,
	open list <linux-kernel@vger.kernel.org>,
	linux-stable <stable@vger.kernel.org>,
	Maxim Levitsky <mlevitsk@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	X86 ML <x86@kernel.org>, kvm list <kvm@vger.kernel.org>
Subject: Re: [PATCH MANUALSEL 5.14 4/9] KVM: x86: reset pdptrs_from_userspace when exiting smm
Date: Thu, 7 Oct 2021 20:53:46 +0530	[thread overview]
Message-ID: <CA+G9fYt6J2UTgC8Ths11xHefj6qYOqS0JMfSMoHYwvMy3NzxWQ@mail.gmail.com> (raw)
In-Reply-To: <e5b8a6d4-6d5c-ada9-bb36-7ed3c8b7d637@redhat.com>

On Wed, 6 Oct 2021 at 19:06, Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 06/10/21 15:30, Sasha Levin wrote:
> > From: Maxim Levitsky <mlevitsk@redhat.com>
> >
> > [ Upstream commit 37687c403a641f251cb2ef2e7830b88aa0647ba9 ]
> >
> > When exiting SMM, pdpts are loaded again from the guest memory.
> >
> > This fixes a theoretical bug, when exit from SMM triggers entry to the
> > nested guest which re-uses some of the migration
> > code which uses this flag as a workaround for a legacy userspace.
> >
> > Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
> > Message-Id: <20210913140954.165665-4-mlevitsk@redhat.com>
> > Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> > Signed-off-by: Sasha Levin <sashal@kernel.org>
> > ---
> >   arch/x86/kvm/x86.c | 7 +++++++
> >   1 file changed, 7 insertions(+)
> >
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index b3f855d48f72..1e7d629bbf36 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -7659,6 +7659,13 @@ static void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm)
> >
> >               /* Process a latched INIT or SMI, if any.  */
> >               kvm_make_request(KVM_REQ_EVENT, vcpu);
> > +
> > +             /*
> > +              * Even if KVM_SET_SREGS2 loaded PDPTRs out of band,
> > +              * on SMM exit we still need to reload them from
> > +              * guest memory
> > +              */
> > +             vcpu->arch.pdptrs_from_userspace = false;
> >       }
> >
> >       kvm_mmu_reset_context(vcpu);
> >
>
> Acked-by: Paolo Bonzini <pbonzini@redhat.com>

Is this expected to be in stable-rc 5.10 and below ?
Because it is breaking the builds on queue/5.10, queue/5.4 and older branches.

arch/x86/kvm/x86.c: In function 'kvm_smm_changed':
arch/x86/kvm/x86.c:6612:27: error: 'struct kvm_vcpu_arch' has no
member named 'pdptrs_from_userspace'
 6612 |                 vcpu->arch.pdptrs_from_userspace = false;
      |                           ^
make[3]: *** [scripts/Makefile.build:262: arch/x86/kvm/x86.o] Error 1

ref:
https://gitlab.com/Linaro/lkft/mirrors/stable/linux-stable-rc-queues/-/jobs/1658987088#L443

- Naresh

  reply	other threads:[~2021-10-07 15:24 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-06 13:30 [PATCH MANUALSEL 5.14 1/9] selftests: KVM: Align SMCCC call with the spec in steal_time Sasha Levin
2021-10-06 13:30 ` [PATCH MANUALSEL 5.14 2/9] KVM: x86: Handle SRCU initialization failure during page track init Sasha Levin
2021-10-06 13:36   ` Paolo Bonzini
2021-10-06 13:30 ` [PATCH MANUALSEL 5.14 3/9] KVM: do not shrink halt_poll_ns below grow_start Sasha Levin
2021-10-06 13:36   ` Paolo Bonzini
2021-10-06 13:30 ` [PATCH MANUALSEL 5.14 4/9] KVM: x86: reset pdptrs_from_userspace when exiting smm Sasha Levin
2021-10-06 13:36   ` Paolo Bonzini
2021-10-07 15:23     ` Naresh Kamboju [this message]
2021-10-07 17:47       ` Paolo Bonzini
2021-10-06 13:30 ` [PATCH MANUALSEL 5.14 5/9] KVM: x86: VMX: synthesize invalid VM exit when emulating invalid guest state Sasha Levin
2021-10-06 13:35   ` Paolo Bonzini
2021-10-06 13:30 ` [PATCH MANUALSEL 5.14 6/9] KVM: x86: nVMX: don't fail nested VM entry on invalid guest state if !from_vmentry Sasha Levin
2021-10-06 13:36   ` Paolo Bonzini
2021-10-06 13:30 ` [PATCH MANUALSEL 5.14 7/9] kvm: x86: Add AMD PMU MSRs to msrs_to_save_all[] Sasha Levin
2021-10-06 13:36   ` Paolo Bonzini
2021-10-06 13:30 ` [PATCH MANUALSEL 5.14 8/9] KVM: x86: nSVM: restore int_vector in svm_clear_vintr Sasha Levin
2021-10-06 13:36   ` Paolo Bonzini
2021-10-06 13:30 ` [PATCH MANUALSEL 5.14 9/9] ALSA: pcsp: Make hrtimer forwarding more robust Sasha Levin
2021-10-06 13:36 ` [PATCH MANUALSEL 5.14 1/9] selftests: KVM: Align SMCCC call with the spec in steal_time Paolo Bonzini

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