[Xen-devel] [Patch 0/4] Refining Xsave/Xrestore support - Version 2

[Haitao Shan <maillists.shan@xxxxxxxxx>]

Hi, Keir,

The following patches refines Xen support for CPU Xsave/Xrestore
support. There are four patches included.
Patch 1/4:
   Cleaning up existing Xsave code in Xen.
       Replace xfeature_low and xfeature_high with a u64 variable
xfeature_mask.
       In structure hvm_vcpu, rename xfeature_mask to xcr0
       Provide EDX:EAX with all bits set to 1 for XSAVE and XRSTOR as
spec recommends
Patch 2/4:
   Adding Xsave/Xrestore support for PV guests. Feature is exposed
via CPUID. XSETBV is trapped and emulated by Xen (via GP#).
Patch 3/4:
   Expose AVX to guest OSs.
Patch 4/4:
   Adding guest save/restore support when Xsave/Xrestore are available.
       Adding a pair of hypercalls for PV guest
       Adding a new data chunk for HVM guest.

I tried to read the related the email thread and incorporated the
comments. These are version 2 of the patch series.

Shan Haitao

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