From: Avi Kivity <avi@redhat.com>
To: "Cui, Dexuan" <dexuan.cui@intel.com>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"Yang, Sheng" <sheng.yang@intel.com>
Subject: Re: [PATCH 1/1] KVM: X86: add the support of XSAVE/XRSTOR to guest
Date: Thu, 06 May 2010 22:49:09 +0300 [thread overview]
Message-ID: <4BE31D35.7050802@redhat.com> (raw)
In-Reply-To: <4BE31C43.9060506@redhat.com>
On 05/06/2010 10:45 PM, Avi Kivity wrote:
>
> All those control registers are annoying, we have cr1 and cr5-cr7
> free, cr9-cr15 on x86_64, infinite msr space, and now we have XCRs.
> Great.
>
> Looking forward to YCR0.
>
I think I see the reason - xgetbv is unprivileged, so applications can
see what the OS supports instead of looking at cpuid and hoping.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
prev parent reply other threads:[~2010-05-06 19:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-29 5:22 [PATCH 1/1] KVM: X86: add the support of XSAVE/XRSTOR to guest Dexuan Cui
2010-05-02 14:13 ` Avi Kivity
2010-05-06 4:23 ` Cui, Dexuan
2010-05-06 8:14 ` Avi Kivity
2010-05-06 14:20 ` Cui, Dexuan
2010-05-06 19:45 ` Avi Kivity
2010-05-06 19:49 ` Avi Kivity [this message]
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