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hv: emulate IA32_EFER and adjust Load EFER VMX controls

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This helps to improve performance:

- Don't need to execute VMREAD in vcpu_get_efer(), which is frequently
  called.

- VMX_EXIT_CTLS_SAVE_EFER can be removed from VM-Exit Controls.

- If the value of IA32_EFER MSR is identical between the host and guest
  (highly likely), adjust the VMX controls not to load IA32_EFER on
  VMExit and VMEntry.

It's convenient to continue use the exiting vcpu_s/get_efer() APIs,
other than the common vcpu_s/get_guest_msr().

Tracked-On: #6289
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Signed-off-by: Zide Chen <zide.chen@intel.com>
This commit is contained in:
Zide Chen
2021-07-05 19:02:24 -07:00
committed by wenlingz
parent 8894081379
commit 6d7eb6d7b6
6 changed files with 52 additions and 16 deletions
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2
hypervisor/include/arch/x86/asm/guest/vcpu.h
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@@ -172,7 +172,7 @@ enum reset_mode;
#define SECURE_WORLD 1
#define NUM_WORLD_MSRS 2U
#define NUM_COMMON_MSRS 22U
#define NUM_COMMON_MSRS 23U
#ifdef CONFIG_NVMX_ENABLED
#define NUM_GUEST_MSRS (NUM_WORLD_MSRS + NUM_COMMON_MSRS + NUM_VMX_MSRS)
#else