diff options
Diffstat (limited to '0045-x86-spec-ctrl-Rename-SCF_ist_wrmsr-to-SCF_ist_sc_msr.patch')
| -rw-r--r-- | 0045-x86-spec-ctrl-Rename-SCF_ist_wrmsr-to-SCF_ist_sc_msr.patch | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/0045-x86-spec-ctrl-Rename-SCF_ist_wrmsr-to-SCF_ist_sc_msr.patch b/0045-x86-spec-ctrl-Rename-SCF_ist_wrmsr-to-SCF_ist_sc_msr.patch new file mode 100644 index 0000000..5b841a6 --- /dev/null +++ b/0045-x86-spec-ctrl-Rename-SCF_ist_wrmsr-to-SCF_ist_sc_msr.patch @@ -0,0 +1,110 @@ +From 31aa2a20bfefc3a8a200da54a56471bf99f9630e Mon Sep 17 00:00:00 2001 +From: Andrew Cooper <andrew.cooper3@citrix.com> +Date: Tue, 28 Jun 2022 14:36:56 +0100 +Subject: [PATCH 45/51] x86/spec-ctrl: Rename SCF_ist_wrmsr to SCF_ist_sc_msr + +We are about to introduce SCF_ist_ibpb, at which point SCF_ist_wrmsr becomes +ambiguous. + +No functional change. + +This is part of XSA-407. + +Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> +Reviewed-by: Jan Beulich <jbeulich@suse.com> +(cherry picked from commit 76d6a36f645dfdbad8830559d4d52caf36efc75e) +--- + xen/arch/x86/spec_ctrl.c | 6 +++--- + xen/include/asm-x86/spec_ctrl.h | 4 ++-- + xen/include/asm-x86/spec_ctrl_asm.h | 8 ++++---- + 3 files changed, 9 insertions(+), 9 deletions(-) + +diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c +index 7e646680f1c7..89f95c083e1b 100644 +--- a/xen/arch/x86/spec_ctrl.c ++++ b/xen/arch/x86/spec_ctrl.c +@@ -1115,7 +1115,7 @@ void __init init_speculation_mitigations(void) + { + if ( opt_msr_sc_pv ) + { +- default_spec_ctrl_flags |= SCF_ist_wrmsr; ++ default_spec_ctrl_flags |= SCF_ist_sc_msr; + setup_force_cpu_cap(X86_FEATURE_SC_MSR_PV); + } + +@@ -1126,7 +1126,7 @@ void __init init_speculation_mitigations(void) + * Xen's value is not restored atomically. An early NMI hitting + * the VMExit path needs to restore Xen's value for safety. + */ +- default_spec_ctrl_flags |= SCF_ist_wrmsr; ++ default_spec_ctrl_flags |= SCF_ist_sc_msr; + setup_force_cpu_cap(X86_FEATURE_SC_MSR_HVM); + } + } +@@ -1139,7 +1139,7 @@ void __init init_speculation_mitigations(void) + * on real hardware matches the availability of MSR_SPEC_CTRL in the + * first place. + * +- * No need for SCF_ist_wrmsr because Xen's value is restored ++ * No need for SCF_ist_sc_msr because Xen's value is restored + * atomically WRT NMIs in the VMExit path. + * + * TODO: Adjust cpu_has_svm_spec_ctrl to be usable earlier on boot. +diff --git a/xen/include/asm-x86/spec_ctrl.h b/xen/include/asm-x86/spec_ctrl.h +index 3cd72e40305f..f8f0ac47e759 100644 +--- a/xen/include/asm-x86/spec_ctrl.h ++++ b/xen/include/asm-x86/spec_ctrl.h +@@ -31,7 +31,7 @@ + * context switched per domain, and some inhibited in the S3 path. + */ + #define SCF_use_shadow (1 << 0) +-#define SCF_ist_wrmsr (1 << 1) ++#define SCF_ist_sc_msr (1 << 1) + #define SCF_ist_rsb (1 << 2) + #define SCF_verw (1 << 3) + +@@ -46,7 +46,7 @@ + * These are the controls to inhibit on the S3 resume path until microcode has + * been reloaded. + */ +-#define SCF_IST_MASK (SCF_ist_wrmsr) ++#define SCF_IST_MASK (SCF_ist_sc_msr) + + /* + * Some speculative protections are per-domain. These settings are merged +diff --git a/xen/include/asm-x86/spec_ctrl_asm.h b/xen/include/asm-x86/spec_ctrl_asm.h +index 66b00d511fc6..0ff1b118f882 100644 +--- a/xen/include/asm-x86/spec_ctrl_asm.h ++++ b/xen/include/asm-x86/spec_ctrl_asm.h +@@ -266,8 +266,8 @@ + + .L\@_skip_rsb: + +- test $SCF_ist_wrmsr, %al +- jz .L\@_skip_wrmsr ++ test $SCF_ist_sc_msr, %al ++ jz .L\@_skip_msr_spec_ctrl + + xor %edx, %edx + testb $3, UREGS_cs(%rsp) +@@ -290,7 +290,7 @@ UNLIKELY_DISPATCH_LABEL(\@_serialise): + * to speculate around the WRMSR. As a result, we need a dispatch + * serialising instruction in the else clause. + */ +-.L\@_skip_wrmsr: ++.L\@_skip_msr_spec_ctrl: + lfence + UNLIKELY_END(\@_serialise) + .endm +@@ -301,7 +301,7 @@ UNLIKELY_DISPATCH_LABEL(\@_serialise): + * Requires %rbx=stack_end + * Clobbers %rax, %rcx, %rdx + */ +- testb $SCF_ist_wrmsr, STACK_CPUINFO_FIELD(spec_ctrl_flags)(%rbx) ++ testb $SCF_ist_sc_msr, STACK_CPUINFO_FIELD(spec_ctrl_flags)(%rbx) + jz .L\@_skip + + DO_SPEC_CTRL_EXIT_TO_XEN +-- +2.35.1 + |