diff options
Diffstat (limited to 'arch/x86/kernel/cpu/bugs.c')
| -rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 60 |
1 files changed, 15 insertions, 45 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index eddbdc843b3f..92031508be01 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -150,55 +150,25 @@ u64 x86_spec_ctrl_get_default(void) } EXPORT_SYMBOL_GPL(x86_spec_ctrl_get_default); -/** - * x86_spec_ctrl_set_guest - Set speculation control registers for the guest - * @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL - * @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL - * (may get translated to MSR_AMD64_LS_CFG bits) - * - * Avoids writing to the MSR if the content/bits are the same - */ -void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) +void +x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool setguest) { - u64 host = x86_spec_ctrl_base; + struct thread_info *ti = current_thread_info(); + u64 msr, host = x86_spec_ctrl_base; /* Is MSR_SPEC_CTRL implemented ? */ - if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) - return; - - /* SSBD controlled in MSR_SPEC_CTRL */ - if (static_cpu_has(X86_FEATURE_SPEC_CTRL_SSBD)) - host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); - - if (host != guest_spec_ctrl) - wrmsrl(MSR_IA32_SPEC_CTRL, guest_spec_ctrl); -} -EXPORT_SYMBOL_GPL(x86_spec_ctrl_set_guest); - -/** - * x86_spec_ctrl_restore_host - Restore host speculation control registers - * @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL - * @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL - * (may get translated to MSR_AMD64_LS_CFG bits) - * - * Avoids writing to the MSR if the content/bits are the same - */ -void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) -{ - u64 host = x86_spec_ctrl_base; - - /* Is MSR_SPEC_CTRL implemented ? */ - if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) - return; - - /* SSBD controlled in MSR_SPEC_CTRL */ - if (static_cpu_has(X86_FEATURE_SPEC_CTRL_SSBD)) - host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); - - if (host != guest_spec_ctrl) - wrmsrl(MSR_IA32_SPEC_CTRL, host); + if (static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) { + /* SSBD controlled in MSR_SPEC_CTRL */ + if (static_cpu_has(X86_FEATURE_SPEC_CTRL_SSBD)) + host |= ssbd_tif_to_spec_ctrl(ti->flags); + + if (host != guest_spec_ctrl) { + msr = setguest ? guest_spec_ctrl : host; + wrmsrl(MSR_IA32_SPEC_CTRL, msr); + } + } } -EXPORT_SYMBOL_GPL(x86_spec_ctrl_restore_host); +EXPORT_SYMBOL_GPL(x86_virt_spec_ctrl); static void x86_amd_ssb_disable(void) { |