Re: [PATCH 09/13] KVM: x86: save/load state on SMM switch

[Radim KrÄmÃÅ]

2015-04-30 13:36+0200, Paolo Bonzini:
> The big ugly one.  This patch adds support for switching in and out of
> system management mode, respectively upon receiving KVM_REQ_SMI and upon
> executing a RSM instruction.  Both 32- and 64-bit formats are supported
> for the SMM state save area.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> ---
> diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
> +static void rsm_set_desc_flags(struct desc_struct *desc, u16 flags)
> +{
> +	desc->g    = (flags >> 15) & 1;
> +	desc->d    = (flags >> 14) & 1;
> +	desc->l    = (flags >> 13) & 1;
> +	desc->avl  = (flags >> 12) & 1;
> +	desc->p    = (flags >> 7) & 1;
> +	desc->dpl  = (flags >> 5) & 3;
> +	desc->s    = (flags >> 4) & 1;
> +	desc->type = flags & 15;

I can't find a description of this ... can you point me to a place where
the gap between 'p' and 'avl' is documented?
(Not that it matters unless the guest reads it, but it's a bit weird.)

Thanks.
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