linux-kernel - Re: [PATCH 0/2] KVM: x86 emulator: emulate MOVAPS and MOVAPD SSE instructions

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Message-ID: <53283803.5010209@redhat.com>
Date:	Tue, 18 Mar 2014 13:11:47 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Igor Mammedov <imammedo@...hat.com>,
	linux-kernel@...r.kernel.org
CC:	gleb@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	x86@...nel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 0/2] KVM: x86 emulator: emulate MOVAPS and MOVAPD SSE
 instructions

Il 17/03/2014 18:38, H. Peter Anvin ha scritto:
> I'm not sure what you mean with "valid real mode selectors"; the normal
> case in big real mode is that either CS = SS = 0 or CS = SS = <some
> program base address>.

I mean "valid according to the VMX spec" for running in vm86 mode: base 
= selector << 4, limit = 0xffff, access rights = 0xf3.

If a segment does not follow the rules, but CS does, we could run the 
guest normally and trap memory accesses to KVM.

Paolo
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