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hv: pass-through xsave feature to guests

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enable Xsave feature and pass-through it to guests
 update based on v2:
  - enable host xsave before expose it to guests.
  - add validation for the value to be set to 'xcr0' before call xsetbv
    when handling xsetbv vmexit.
  - tested in SOS guest, created two threads to do different
    FP calculations,test code runs in user land of sos.

Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Yonghua Huang
2018-03-29 01:31:19 +08:00
committed by Jack Ren
parent 70625f04d3
commit 316731c9a5
6 changed files with 114 additions and 15 deletions
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10
hypervisor/include/arch/x86/cpu.h
View File

@@ -247,6 +247,7 @@ bool is_vapic_supported(void);
bool is_vapic_intr_delivery_supported(void);
bool is_vapic_virt_reg_supported(void);
bool get_vmx_cap(void);
bool is_xsave_supported(void);
/* Read control register */
#define CPU_CR_READ(cr, result_ptr) \
@@ -427,6 +428,15 @@ msr_write(uint32_t reg_num, uint64_t value64)
CPU_MSR_WRITE(reg_num, value64);
}
static inline void
write_xcr(int reg, uint64_t val)
{
uint32_t low, high;
low = val;
high = val >> 32;
asm volatile("xsetbv" : : "c" (reg), "a" (low), "d" (high));
}
#else /* ASSEMBLER defined */
#endif /* ASSEMBLER defined */

2
hypervisor/include/arch/x86/vmx.h
View File

@@ -83,6 +83,8 @@
#define VMX_EOI_EXIT3_FULL 0x00002022
#define VMX_EOI_EXIT3_HIGH 0x00002023
#define VMX_EOI_EXIT(vector) (VMX_EOI_EXIT0_FULL + ((vector) / 64) * 2)
#define VMX_XSS_EXITING_BITMAP_FULL 0x0000202C
#define VMX_XSS_EXITING_BITMAP_HIGH 0x0000202D
/* 64-bit read-only data fields */
#define VMX_GUEST_PHYSICAL_ADDR_FULL 0x00002400
#define VMX_GUEST_PHYSICAL_ADDR_HIGH 0x00002401