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Re: [Xen-devel] [PATCH 2/2] x86/HVM: adjust feature checking in MSR intercept handling

To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Date: Mon, 5 Sep 2016 16:20:34 +0100
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>
Delivery-date: Mon, 05 Sep 2016 15:20:55 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 02/09/16 11:21, Jan Beulich wrote:

Consistently consult hvm_cpuid(). With that, BNDCFGS gets better
handled outside of VMX specific code, just like XSS. Don't needlessly
check for MTRR support when the MSR being accessed clearly is not an
MTRR one.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

:( Yet more overhead from extra hvm_cpuid() calls. I really need to get on with fixing it.

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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References:
- [Xen-devel] [PATCH 0/2] x86/HVM: feature checking improvements
  - From: Jan Beulich
- [Xen-devel] [PATCH 2/2] x86/HVM: adjust feature checking in MSR intercept handling
  - From: Jan Beulich

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