KVM: VMX: Avoid to rdmsrl(MSR_IA32_SYSENTER_ESP)
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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