x86/kvm/vmx: avoid expensive rdmsr for MSR_GS_BASE

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vmx_save_host_state() is only called from kvm_arch_vcpu_ioctl_run() so
the context is pretty well defined and as we're past 'swapgs' MSR_GS_BASE
should contain kernel's GS base which we point to irq_stack_union.

Add new kernelmode_gs_base() API, irq_stack_union needs to be exported
as KVM can be build as module.

Acked-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Vitaly Kuznetsov 2018-03-13 18:48:05 +01:00 • committed by Paolo Bonzini

parent 42b933b597

commit 35060ed6a1

3 changed files with 9 additions and 2 deletions

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5

arch/x86/include/asm/processor.h

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3

arch/x86/kernel/cpu/common.c

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3

arch/x86/kvm/vmx.c

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