diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0072-x86-bugs-Unify-x86_spec_ctrl_-set_guest-restore_host.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0072-x86-bugs-Unify-x86_spec_ctrl_-set_guest-restore_host.patch | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0072-x86-bugs-Unify-x86_spec_ctrl_-set_guest-restore_host.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0072-x86-bugs-Unify-x86_spec_ctrl_-set_guest-restore_host.patch new file mode 100644 index 00000000..e3e0a67d --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0072-x86-bugs-Unify-x86_spec_ctrl_-set_guest-restore_host.patch @@ -0,0 +1,145 @@ +From f30cba1d35ebb9a07ebd54253086280080b366a6 Mon Sep 17 00:00:00 2001 +From: Borislav Petkov <bp@suse.de> +Date: Sat, 12 May 2018 00:14:51 +0200 +Subject: [PATCH 72/93] x86/bugs: Unify x86_spec_ctrl_{set_guest,restore_host} + +commit cc69b34989210f067b2c51d5539b5f96ebcc3a01 upstream + +Function bodies are very similar and are going to grow more almost +identical code. Add a bool arg to determine whether SPEC_CTRL is being set +for the guest or restored to the host. + +No functional changes. + +Signed-off-by: Borislav Petkov <bp@suse.de> +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> +Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + arch/x86/include/asm/spec-ctrl.h | 33 +++++++++++++++++++--- + arch/x86/kernel/cpu/bugs.c | 60 ++++++++++------------------------------ + 2 files changed, 44 insertions(+), 49 deletions(-) + +diff --git a/arch/x86/include/asm/spec-ctrl.h b/arch/x86/include/asm/spec-ctrl.h +index 82b6c5a..9cecbe5 100644 +--- a/arch/x86/include/asm/spec-ctrl.h ++++ b/arch/x86/include/asm/spec-ctrl.h +@@ -13,10 +13,35 @@ + * Takes the guest view of SPEC_CTRL MSR as a parameter and also + * the guest's version of VIRT_SPEC_CTRL, if emulated. + */ +-extern void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, +- u64 guest_virt_spec_ctrl); +-extern void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, +- u64 guest_virt_spec_ctrl); ++extern void x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool guest); ++ ++/** ++ * 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 ++ */ ++static inline ++void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) ++{ ++ x86_virt_spec_ctrl(guest_spec_ctrl, guest_virt_spec_ctrl, true); ++} ++ ++/** ++ * 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 ++ */ ++static inline ++void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) ++{ ++ x86_virt_spec_ctrl(guest_spec_ctrl, guest_virt_spec_ctrl, false); ++} + + /* AMD specific Speculative Store Bypass MSR data */ + extern u64 x86_amd_ls_cfg_base; +diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c +index eddbdc8..9203150 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) + { +-- +2.7.4 + |