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SUSE:SLE-12-SP3:GA
xen.8426
5afc13ae-7-x86-split-X86_FEATURE_SC_MSR.patch
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File 5afc13ae-7-x86-split-X86_FEATURE_SC_MSR.patch of Package xen.8426
# Commit fa9eb09d446a1279f5e861e6b84fa8675dabf148 # Date 2018-05-16 12:19:10 +0100 # Author Andrew Cooper <andrew.cooper3@citrix.com> # Committer Andrew Cooper <andrew.cooper3@citrix.com> x86/spec_ctrl: Split X86_FEATURE_SC_MSR into PV and HVM variants In order to separately control whether MSR_SPEC_CTRL is virtualised for PV and HVM guests, split the feature used to control runtime alternatives into two. Xen will use MSR_SPEC_CTRL itself if either of these features are active. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Wei Liu <wei.liu2@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> --- a/xen/arch/x86/cpu/common.c +++ b/xen/arch/x86/cpu/common.c @@ -357,9 +357,12 @@ void __cpuinit identify_cpu(struct cpuin if (test_bit(X86_FEATURE_IND_THUNK_JMP, boot_cpu_data.x86_capability)) __set_bit(X86_FEATURE_IND_THUNK_JMP, c->x86_capability); - if (test_bit(X86_FEATURE_SC_MSR, + if (test_bit(X86_FEATURE_SC_MSR_PV, boot_cpu_data.x86_capability)) - __set_bit(X86_FEATURE_SC_MSR, c->x86_capability); + __set_bit(X86_FEATURE_SC_MSR_PV, c->x86_capability); + if (test_bit(X86_FEATURE_SC_MSR_HVM, + boot_cpu_data.x86_capability)) + __set_bit(X86_FEATURE_SC_MSR_HVM, c->x86_capability); if (test_bit(X86_FEATURE_SC_RSB_PV, boot_cpu_data.x86_capability)) __set_bit(X86_FEATURE_SC_RSB_PV, c->x86_capability); --- a/xen/arch/x86/spec_ctrl.c +++ b/xen/arch/x86/spec_ctrl.c @@ -114,7 +114,8 @@ static void __init print_details(enum in thunk == THUNK_RETPOLINE ? "RETPOLINE" : thunk == THUNK_LFENCE ? "LFENCE" : thunk == THUNK_JMP ? "JMP" : "?", - boot_cpu_has(X86_FEATURE_SC_MSR) ? + (boot_cpu_has(X86_FEATURE_SC_MSR_PV) || + boot_cpu_has(X86_FEATURE_SC_MSR_HVM)) ? default_xen_spec_ctrl & SPEC_CTRL_IBRS ? " IBRS+" : " IBRS-" : "", opt_ibpb ? " IBPB" : "", @@ -272,7 +273,8 @@ void __init init_speculation_mitigations * need the IBRS entry/exit logic to virtualise IBRS support for * guests. */ - __set_bit(X86_FEATURE_SC_MSR, boot_cpu_data.x86_capability); + __set_bit(X86_FEATURE_SC_MSR_PV, boot_cpu_data.x86_capability); + __set_bit(X86_FEATURE_SC_MSR_HVM, boot_cpu_data.x86_capability); if ( ibrs ) default_xen_spec_ctrl |= SPEC_CTRL_IBRS; --- a/xen/include/asm-x86/cpufeature.h +++ b/xen/include/asm-x86/cpufeature.h @@ -67,8 +67,9 @@ #define X86_FEATURE_IND_THUNK_LFENCE (3*32+ 1) /* Use IND_THUNK_LFENCE */ #define X86_FEATURE_IND_THUNK_JMP (3*32+ 2) /* Use IND_THUNK_JMP */ #define X86_FEATURE_XEN_IBPB (3*32+ 3) /* IBRSB || IBPB */ -#define X86_FEATURE_SC_MSR (3*32+ 4) /* MSR_SPEC_CTRL used by Xen */ -#define X86_FEATURE_SC_MSR_IDLE (3*32+ 5) /* SC_MSR && default_xen_spec_ctrl */ +#define X86_FEATURE_SC_MSR_PV (3*32+ 4) /* MSR_SPEC_CTRL used by Xen for PV */ +#define X86_FEATURE_SC_MSR_HVM (3*32+ 5) /* MSR_SPEC_CTRL used by Xen for HVM */ +#define X86_FEATURE_SC_MSR_IDLE (3*32+ 6) /* (SC_MSR_PV || SC_MSR_HVM) && default_xen_spec_ctrl */ #define X86_FEATURE_MFENCE_RDTSC (3*32+ 7) /* MFENCE synchronizes RDTSC */ #define X86_FEATURE_CONSTANT_TSC (3*32+ 8) /* TSC ticks at a constant rate */ #define X86_FEATURE_NONSTOP_TSC (3*32+ 9) /* TSC does not stop in C states */ --- a/xen/include/asm-x86/spec_ctrl_asm.h +++ b/xen/include/asm-x86/spec_ctrl_asm.h @@ -223,36 +223,36 @@ ALTERNATIVE __stringify(ASM_NOP40), \ DO_OVERWRITE_RSB, X86_FEATURE_SC_RSB_HVM; \ ALTERNATIVE __stringify(ASM_NOP34), \ - DO_SPEC_CTRL_ENTRY_FROM_HVM, X86_FEATURE_SC_MSR + DO_SPEC_CTRL_ENTRY_FROM_HVM, X86_FEATURE_SC_MSR_HVM /* Use after an entry from PV context (syscall/sysenter/int80/int82/etc). */ #define SPEC_CTRL_ENTRY_FROM_PV \ ALTERNATIVE __stringify(ASM_NOP40), \ DO_OVERWRITE_RSB, X86_FEATURE_SC_RSB_PV; \ ALTERNATIVE __stringify(ASM_NOP25), \ - __stringify(DO_SPEC_CTRL_ENTRY maybexen=0), X86_FEATURE_SC_MSR + __stringify(DO_SPEC_CTRL_ENTRY maybexen=0), X86_FEATURE_SC_MSR_PV /* Use in interrupt/exception context. May interrupt Xen or PV context. */ #define SPEC_CTRL_ENTRY_FROM_INTR \ ALTERNATIVE __stringify(ASM_NOP40), \ DO_OVERWRITE_RSB, X86_FEATURE_SC_RSB_PV; \ ALTERNATIVE __stringify(ASM_NOP39), \ - __stringify(DO_SPEC_CTRL_ENTRY maybexen=1), X86_FEATURE_SC_MSR + __stringify(DO_SPEC_CTRL_ENTRY maybexen=1), X86_FEATURE_SC_MSR_PV /* Use when exiting to Xen context. */ #define SPEC_CTRL_EXIT_TO_XEN \ ALTERNATIVE __stringify(ASM_NOP23), \ - DO_SPEC_CTRL_EXIT_TO_XEN, X86_FEATURE_SC_MSR + DO_SPEC_CTRL_EXIT_TO_XEN, X86_FEATURE_SC_MSR_PV /* Use when exiting to PV guest context. */ #define SPEC_CTRL_EXIT_TO_PV \ ALTERNATIVE __stringify(ASM_NOP24), \ - DO_SPEC_CTRL_EXIT_TO_GUEST, X86_FEATURE_SC_MSR + DO_SPEC_CTRL_EXIT_TO_GUEST, X86_FEATURE_SC_MSR_PV /* Use when exiting to HVM guest context. */ #define SPEC_CTRL_EXIT_TO_HVM \ ALTERNATIVE __stringify(ASM_NOP24), \ - DO_SPEC_CTRL_EXIT_TO_GUEST, X86_FEATURE_SC_MSR + DO_SPEC_CTRL_EXIT_TO_GUEST, X86_FEATURE_SC_MSR_HVM /* * Use in IST interrupt/exception context. May interrupt Xen or PV context.
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