[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen stable-4.15] x86/spec-ctrl: Turn the remaining SPEC_CTRL_{ENTRY,EXIT}_* into asm macros
commit 67b97438604c6a7ff7ee3dd5c98fff3f5669f6d7 Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> AuthorDate: Fri Sep 1 11:38:44 2023 +0100 Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> CommitDate: Tue Sep 19 19:38:35 2023 +0100 x86/spec-ctrl: Turn the remaining SPEC_CTRL_{ENTRY,EXIT}_* into asm macros These have grown more complex over time, with some already having been converted. Provide full Requires/Clobbers comments, otherwise missing at this level of indirection. No functional change. Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> (cherry picked from commit 7125429aafb9e3c9c88fc93001fc2300e0ac2cc8) --- xen/include/asm-x86/spec_ctrl_asm.h | 37 ++++++++++++++++++++++++++++--------- 1 file changed, 28 insertions(+), 9 deletions(-) diff --git a/xen/include/asm-x86/spec_ctrl_asm.h b/xen/include/asm-x86/spec_ctrl_asm.h index bff3e7f085..1b4078ed8e 100644 --- a/xen/include/asm-x86/spec_ctrl_asm.h +++ b/xen/include/asm-x86/spec_ctrl_asm.h @@ -231,26 +231,45 @@ .endm /* Use after an entry from PV context (syscall/sysenter/int80/int82/etc). */ -#define SPEC_CTRL_ENTRY_FROM_PV \ +.macro SPEC_CTRL_ENTRY_FROM_PV +/* + * Requires %rsp=regs/cpuinfo, %rdx=0 + * Clobbers %rax, %rcx, %rdx + */ ALTERNATIVE "", __stringify(DO_SPEC_CTRL_COND_IBPB maybexen=0), \ - X86_FEATURE_IBPB_ENTRY_PV; \ - ALTERNATIVE "", DO_OVERWRITE_RSB, X86_FEATURE_SC_RSB_PV; \ + X86_FEATURE_IBPB_ENTRY_PV + + ALTERNATIVE "", DO_OVERWRITE_RSB, X86_FEATURE_SC_RSB_PV + ALTERNATIVE "", __stringify(DO_SPEC_CTRL_ENTRY maybexen=0), \ X86_FEATURE_SC_MSR_PV +.endm /* Use in interrupt/exception context. May interrupt Xen or PV context. */ -#define SPEC_CTRL_ENTRY_FROM_INTR \ +.macro SPEC_CTRL_ENTRY_FROM_INTR +/* + * Requires %rsp=regs, %r14=stack_end, %rdx=0 + * Clobbers %rax, %rcx, %rdx + */ ALTERNATIVE "", __stringify(DO_SPEC_CTRL_COND_IBPB maybexen=1), \ - X86_FEATURE_IBPB_ENTRY_PV; \ - ALTERNATIVE "", DO_OVERWRITE_RSB, X86_FEATURE_SC_RSB_PV; \ + X86_FEATURE_IBPB_ENTRY_PV + + ALTERNATIVE "", DO_OVERWRITE_RSB, X86_FEATURE_SC_RSB_PV + ALTERNATIVE "", __stringify(DO_SPEC_CTRL_ENTRY maybexen=1), \ X86_FEATURE_SC_MSR_PV +.endm /* Use when exiting to PV guest context. */ -#define SPEC_CTRL_EXIT_TO_PV \ - ALTERNATIVE "", \ - DO_SPEC_CTRL_EXIT_TO_GUEST, X86_FEATURE_SC_MSR_PV; \ +.macro SPEC_CTRL_EXIT_TO_PV +/* + * Requires %rax=spec_ctrl, %rsp=regs/info + * Clobbers %rcx, %rdx + */ + ALTERNATIVE "", DO_SPEC_CTRL_EXIT_TO_GUEST, X86_FEATURE_SC_MSR_PV + DO_SPEC_CTRL_COND_VERW +.endm /* * Use in IST interrupt/exception context. May interrupt Xen or PV context. -- generated by git-patchbot for /home/xen/git/xen.git#stable-4.15
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