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authorBorislav Petkov <bp@suse.de>2018-05-12 01:14:51 +0300
committerThomas Gleixner <tglx@linutronix.de>2018-05-17 18:09:19 +0300
commitcc69b34989210f067b2c51d5539b5f96ebcc3a01 (patch)
tree76b885e4b52b2901d9f0d6f3801669b203377429 /arch/x86/include/asm/spec-ctrl.h
parent0270be3e34efb05a88bc4c422572ece038ef3608 (diff)
downloadlinux-cc69b34989210f067b2c51d5539b5f96ebcc3a01.tar.xz
x86/bugs: Unify x86_spec_ctrl_{set_guest,restore_host}
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>
Diffstat (limited to 'arch/x86/include/asm/spec-ctrl.h')
-rw-r--r--arch/x86/include/asm/spec-ctrl.h33
1 files changed, 29 insertions, 4 deletions
diff --git a/arch/x86/include/asm/spec-ctrl.h b/arch/x86/include/asm/spec-ctrl.h
index 82b6c5a0d61e..9cecbe5e57ee 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;