x86/kvm/vmx: read MSR_{FS,KERNEL_GS}_BASE from current->thread

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vmx_save_host_state() is only called from kvm_arch_vcpu_ioctl_run() so
the context is pretty well defined. Read MSR_{FS,KERNEL_GS}_BASE from
current->thread after calling save_fsgs() which takes care of
X86_BUG_NULL_SEG case now and will do RD[FG,GS]BASE when FSGSBASE
extensions are exposed to userspace (currently they are not).

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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Vitaly Kuznetsov 2018-03-13 18:48:04 +01:00 • committed by Paolo Bonzini

parent b31c114b82

commit 42b933b597

3 changed files with 29 additions and 3 deletions

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5

arch/x86/include/asm/processor.h

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14

arch/x86/kernel/process_64.c

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13

arch/x86/kvm/vmx.c

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