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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150504195902.GA15848@potion.brq.redhat.com>
Date:	Mon, 4 May 2015 21:59:02 +0200
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, bsd@...hat.com,
	guangrong.xiao@...ux.intel.com,
	Yang Zhang <yang.z.zhang@...el.com>, wanpeng.li@...ux.intel.com
Subject: Re: [PATCH 09/13] KVM: x86: save/load state on SMM switch

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@...hat.com>
> ---
> 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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/