linux-kernel - Re: [PATCH 08/12] KVM: x86: save/load state on SMM switch

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Date:	Thu, 21 May 2015 18:21:48 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, bsd@...hat.com
Subject: Re: [PATCH 08/12] KVM: x86: save/load state on SMM switch



On 21/05/2015 18:20, Radim Krčmář wrote:
> 
>> > +	set_desc_base(&desc,      get_smstate(u32, smbase, offset + 8));
>> > +	set_desc_limit(&desc,     get_smstate(u32, smbase, offset + 4));
>> > +	rsm_set_desc_flags(&desc, get_smstate(u32, smbase, offset));
> (There wan't a layout where this would be right, so we could save the
>  shifting of those flags in 64 bit mode.  Intel P6 was close, and they
>  had only 2 bytes for access right, which means they weren't shifted.)

Check the AMD architecture manual.

Paolo
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