linux-kernel - Re: [PATCH] x86: kvm: use alternatives for VMCALL vs. VMMCALL if kernel text is read-only

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Message-ID: <5421288C.9090805@redhat.com>
Date:	Tue, 23 Sep 2014 10:00:12 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	chris@...chsys.com, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH] x86: kvm: use alternatives for VMCALL vs. VMMCALL if
 kernel text is read-only

Il 22/09/2014 21:43, Borislav Petkov ha scritto:
>> > On x86_64, kernel text mappings are mapped read-only with CONFIG_DEBUG_RODATA.
> Hmm, that depends on DEBUG_KERNEL.
> 
> I think you're actually talking about distro kernels which enable
> CONFIG_DEBUG_RODATA, right?

This is for guest kernels, so it's not necessarily distro kernels.
Anyone who compiles their kernel with CONFIG_DEBUG_RODATA + PV spinlocks
would not be able to run it on AMD.

Paolo
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