[Xen-devel] [PATCH 0/3 v2] XSAVE/XRSTOR fixes and enhancements

["Han, Weidong" <weidong.han@xxxxxxxxx>]

Change logs from v1 -> v2:
        Due to not guarantee backward compatibility, drop the guest 
save/restore patch here. Will re-implement it later. In addition, split the 
original fix frozen states patch into XSAVE/XRSTOR cleanup patch and fix frozen 
state patch.

Patch 1/3: XSAVE/XRSTOR: some cleanups
        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 2/3: Fix frozen states 
        If a guest sets a state and dirties the state, but later temporarily 
clears the state, and at this time if this vcpu is scheduled out, then other 
vcpus may corrupt the state before the vcpu is scheduled in again, thus the 
state cannot be restored correctly. To solve this issue, this patch 
save/restore all states unconditionally on vcpu context switch.

Patch 3/3. Enable guest AVX
        This patch enables Intel(R) Advanced Vector Extension (AVX) for guest.


Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>

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