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hv: support xsave in context switch

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xsave area:
    legacy region: 512 bytes
    xsave header: 64 bytes
    extended region: < 3k bytes

So, pre-allocate 4k area for xsave. Use certain instruction to save or
restore the area according to hardware xsave feature set.

Tracked-On: #4166
Signed-off-by: Conghui Chen <conghui.chen@intel.com>
Reviewed-by: Anthony Xu <anthony.xu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Conghui Chen
2019-11-25 18:57:36 +00:00
committed by wenlingz
parent 8ba203a165
commit e61412981d
10 changed files with 153 additions and 37 deletions
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hypervisor/include/arch/x86/cpuid.h
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@@ -113,6 +113,7 @@
#define CPUID_TLB 2U
#define CPUID_SERIALNUM 3U
#define CPUID_EXTEND_FEATURE 7U
#define CPUID_XSAVE_FEATURES 0xDU
#define CPUID_RSD_ALLOCATION 0x10U
#define CPUID_MAX_EXTENDED_FUNCTION 0x80000000U
#define CPUID_EXTEND_FUNCTION_1 0x80000001U