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Peter Anvin" , Boris Ostrovsky , Stefano Stabellini Subject: [PATCH v2 02/12] x86/xen: use specific Xen pv interrupt entry for DF Date: Fri, 20 Nov 2020 12:46:20 +0100 Message-Id: <20201120114630.13552-3-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201120114630.13552-1-jgross@suse.com> References: <20201120114630.13552-1-jgross@suse.com> MIME-Version: 1.0 Xen PV guests don't use IST. For double fault interrupts switch to the same model as NMI. Correct a typo in a comment while copying it. Signed-off-by: Juergen Gross Acked-by: Peter Zijlstra (Intel) Reviewed-by: Thomas Gleixner --- V2: - fix typo (Andy Lutomirski) --- arch/x86/include/asm/idtentry.h | 3 +++ arch/x86/xen/enlighten_pv.c | 10 ++++++++-- arch/x86/xen/xen-asm.S | 2 +- 3 files changed, 12 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h index 3505c0396fa5..b35825392547 100644 --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -611,6 +611,9 @@ DECLARE_IDTENTRY_RAW(X86_TRAP_DB, xenpv_exc_debug); /* #DF */ DECLARE_IDTENTRY_DF(X86_TRAP_DF, exc_double_fault); +#ifdef CONFIG_XEN_PV +DECLARE_IDTENTRY_RAW_ERRORCODE(X86_TRAP_DF, xenpv_exc_double_fault); +#endif /* #VC */ #ifdef CONFIG_AMD_MEM_ENCRYPT diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index 9f5e44c1f70a..76616024129e 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -567,10 +567,16 @@ void noist_exc_debug(struct pt_regs *regs); DEFINE_IDTENTRY_RAW(xenpv_exc_nmi) { - /* On Xen PV, NMI doesn't use IST. The C part is the sane as native. */ + /* On Xen PV, NMI doesn't use IST. The C part is the same as native. */ exc_nmi(regs); } +DEFINE_IDTENTRY_RAW_ERRORCODE(xenpv_exc_double_fault) +{ + /* On Xen PV, DF doesn't use IST. The C part is the same as native. */ + exc_double_fault(regs, error_code); +} + DEFINE_IDTENTRY_RAW(xenpv_exc_debug) { /* @@ -615,7 +621,7 @@ struct trap_array_entry { static struct trap_array_entry trap_array[] = { TRAP_ENTRY_REDIR(exc_debug, true ), - TRAP_ENTRY(exc_double_fault, true ), + TRAP_ENTRY_REDIR(exc_double_fault, true ), #ifdef CONFIG_X86_MCE TRAP_ENTRY_REDIR(exc_machine_check, true ), #endif diff --git a/arch/x86/xen/xen-asm.S b/arch/x86/xen/xen-asm.S index bc2586730a5b..1d054c915046 100644 --- a/arch/x86/xen/xen-asm.S +++ b/arch/x86/xen/xen-asm.S @@ -161,7 +161,7 @@ xen_pv_trap asm_exc_overflow xen_pv_trap asm_exc_bounds xen_pv_trap asm_exc_invalid_op xen_pv_trap asm_exc_device_not_available -xen_pv_trap asm_exc_double_fault +xen_pv_trap asm_xenpv_exc_double_fault xen_pv_trap asm_exc_coproc_segment_overrun xen_pv_trap asm_exc_invalid_tss xen_pv_trap asm_exc_segment_not_present