From: Gleb Natapov <gleb@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Avi Kivity <avi@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
kvm@vger.kernel.org
Subject: Re: [PATCH 3/8] KVM: Activate fpu on clts
Date: Wed, 3 Feb 2010 12:23:54 +0200 [thread overview]
Message-ID: <20100203102354.GL739@redhat.com> (raw)
In-Reply-To: <4B67DF6C.3000507@redhat.com>
On Tue, Feb 02, 2010 at 09:16:44AM +0100, Paolo Bonzini wrote:
> On 01/21/2010 02:31 PM, Avi Kivity wrote:
> >diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> >index feca59f..09207ba 100644
> >--- a/arch/x86/kvm/x86.c
> >+++ b/arch/x86/kvm/x86.c
> >@@ -3266,6 +3266,7 @@ int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
> > int emulate_clts(struct kvm_vcpu *vcpu)
> > {
> > kvm_x86_ops->set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS));
> >+ kvm_x86_ops->fpu_activate(vcpu);
> > return X86EMUL_CONTINUE;
> > }
>
> Can this code be reached if CLTS is executed in real mode? That
> would cause a NULL-pointer access on VMX.
>
We should assume that any part of emulator can be reached from a guest
and do check accordingly.
--
Gleb.
next prev parent reply other threads:[~2010-02-03 10:23 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-21 13:31 [PATCH 0/8] cr0/cr4/efer/fpu miscellaneous bits Avi Kivity
2010-01-21 13:31 ` [PATCH 1/8] KVM: Allow kvm_load_guest_fpu() even when !vcpu->fpu_active Avi Kivity
2010-01-21 13:31 ` [PATCH 2/8] KVM: Drop kvm_{load,put}_guest_fpu() exports Avi Kivity
2010-01-21 13:31 ` [PATCH 3/8] KVM: Activate fpu on clts Avi Kivity
2010-01-23 18:56 ` Marcelo Tosatti
2010-01-24 7:20 ` Avi Kivity
2010-02-02 8:16 ` Paolo Bonzini
2010-02-03 10:23 ` Gleb Natapov [this message]
2010-02-04 13:05 ` Avi Kivity
2010-02-04 13:11 ` Gleb Natapov
2010-02-04 17:56 ` Avi Kivity
2010-02-07 12:25 ` Avi Kivity
2010-01-21 13:31 ` [PATCH 4/8] KVM: Add a helper for checking if the guest is in protected mode Avi Kivity
2010-01-21 13:31 ` [PATCH 5/8] KVM: Move cr0/cr4/efer related helpers to x86.h Avi Kivity
2010-01-21 13:31 ` [PATCH 6/8] KVM: Rename vcpu->shadow_efer to efer Avi Kivity
2010-01-21 13:31 ` [PATCH 7/8] KVM: Optimize kvm_read_cr[04]_bits() Avi Kivity
2010-02-05 8:26 ` Jan Kiszka
2010-02-07 12:05 ` Avi Kivity
2010-02-07 12:33 ` Jan Kiszka
2010-02-07 12:37 ` Avi Kivity
2010-02-07 13:20 ` Jan Kiszka
2010-01-21 13:31 ` [PATCH 8/8] KVM: trace guest fpu loads and unloads Avi Kivity
2010-01-23 19:02 ` [PATCH 0/8] cr0/cr4/efer/fpu miscellaneous bits Marcelo Tosatti
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