diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-03-13 18:48:04 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-03-16 22:03:53 +0100 |
| commit | 42b933b59721f288e3ce23ca79a17a973808dab9 (patch) | |
| tree | 24f455d30d65833ac4eb2d00a2029f09519aa5aa /arch/x86/include/asm/processor.h | |
| parent | b31c114b82b2b55913d2cf744e6a665c2ca090ac (diff) | |
x86/kvm/vmx: read MSR_{FS,KERNEL_GS}_BASE from current->thread
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>
Diffstat (limited to 'arch/x86/include/asm/processor.h')
| -rw-r--r-- | arch/x86/include/asm/processor.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index b0ccd4847a58..1d816a3325a1 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -410,6 +410,11 @@ DECLARE_INIT_PER_CPU(irq_stack_union); DECLARE_PER_CPU(char *, irq_stack_ptr); DECLARE_PER_CPU(unsigned int, irq_count); extern asmlinkage void ignore_sysret(void); + +#if IS_ENABLED(CONFIG_KVM) +/* Save actual FS/GS selectors and bases to current->thread */ +void save_fsgs_for_kvm(void); +#endif #else /* X86_64 */ #ifdef CONFIG_CC_STACKPROTECTOR /* |