linux-kernel - Re: [PATCH v2] kvm: x86: zero EFER on INIT

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Message-ID: <20151019144846.GA3396@potion.brq.redhat.com>
Date:	Mon, 19 Oct 2015 16:48:47 +0200
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	stable@...r.kernel.org, Yang Z Zhang <yang.z.zhang@...el.com>
Subject: Re: [PATCH v2] kvm: x86: zero EFER on INIT

2015-10-19 11:35+0200, Paolo Bonzini:
> Not zeroing EFER means that a 32-bit firmware cannot enter paging mode
> without clearing EFER.LME first (which it should not know about).
> Yang Zhang from Intel confirmed that the manual is wrong and EFER is
> cleared to zero on INIT.

Also in APM v2, "Table 14-1. Initial Processor State.".

> 
> Fixes: d28bc9dd25ce023270d2e039e7c98d38ecbf7758
> Cc: stable@...r.kernel.org
> Cc: Yang Z Zhang <yang.z.zhang@...el.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Reviewed-by: Radim Krčmář <rkrcmar@...hat.com>
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