linux-kernel - Re: [PATCH 1/9] x86: export get_xsave

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Message-ID: <548099DF.4080202@redhat.com>
Date:	Thu, 04 Dec 2014 18:29:03 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	rkrcmar@...hat.com, Wanpeng Li <wanpeng.li@...ux.intel.com>,
	stable@...r.kernel.org, x86@...nel.org,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH 1/9] x86: export get_xsave_addr



On 04/12/2014 17:34, Greg KH wrote:
> On Thu, Dec 04, 2014 at 04:57:06PM +0100, Paolo Bonzini wrote:
>> > get_xsave_addr is the API to access XSAVE states, and KVM would
>> > like to use it.  Export it.
> Use it in what way?

As in patch 2/9, to avoid that upgrading to a newer processor breaks
userspace ABI.

>> > Cc: stable@...r.kernel.org
> Why is this a stable patch?

Because as of now, Skylake processors have a different userspace ABI
than previous generations.

Paolo
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