KVM: VMX: Avoid to rdmsrl(MSR_IA32_SYSENTER_ESP)

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The value of host MSR_IA32_SYSENTER_ESP is known to be constant for
each CPU: (cpu_entry_stack(cpu) + 1) when 32 bit syscall is enabled or
NULL is 32 bit syscall is not enabled.

So rdmsrl() can be avoided for the first case and both rdmsrl() and
vmcs_writel() can be avoided for the second case.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Message-Id: <20211118110814.2568-3-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Lai Jiangshan 2021-11-18 19:08:01 +08:00 • committed by Paolo Bonzini

parent 24cd19a28c

commit 6ab8a4053f

1 changed files with 11 additions and 3 deletions

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arch/x86/kvm/vmx/vmx.c

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