From f57584dc874f0ba92403b4ade631c232564fb027 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 28 Mar 2014 11:49:20 +0100 Subject: [PATCH] target-i386: simplify SMAP handling in MMU_KSMAP_IDX Do not use this MMU index at all if CR4.SMAP is false, and drop the SMAP check from x86_cpu_handle_mmu_fault. Signed-off-by: Paolo Bonzini --- target-i386/cpu.h | 2 +- target-i386/helper.c | 12 ++++-------- 2 files changed, 5 insertions(+), 9 deletions(-) diff --git a/target-i386/cpu.h b/target-i386/cpu.h index b80df664a1..f2d5b1949e 100644 --- a/target-i386/cpu.h +++ b/target-i386/cpu.h @@ -1162,7 +1162,7 @@ static inline CPUX86State *cpu_init(const char *cpu_model) static inline int cpu_mmu_index(CPUX86State *env) { return (env->hflags & HF_CPL_MASK) == 3 ? MMU_USER_IDX : - ((env->hflags & HF_SMAP_MASK) && (env->eflags & AC_MASK)) + (!(env->hflags & HF_SMAP_MASK) || (env->eflags & AC_MASK)) ? MMU_KNOSMAP_IDX : MMU_KSMAP_IDX; } diff --git a/target-i386/helper.c b/target-i386/helper.c index 6d8e350681..d10de26934 100644 --- a/target-i386/helper.c +++ b/target-i386/helper.c @@ -649,8 +649,7 @@ int x86_cpu_handle_mmu_fault(CPUState *cs, vaddr addr, break; case MMU_KSMAP_IDX: - if (is_write1 != 2 && (env->cr[4] & CR4_SMAP_MASK) && - (ptep & PG_USER_MASK)) { + if (is_write1 != 2 && (ptep & PG_USER_MASK)) { goto do_fault_protect; } /* fall through */ @@ -711,8 +710,7 @@ int x86_cpu_handle_mmu_fault(CPUState *cs, vaddr addr, break; case MMU_KSMAP_IDX: - if (is_write1 != 2 && (env->cr[4] & CR4_SMAP_MASK) && - (ptep & PG_USER_MASK)) { + if (is_write1 != 2 && (ptep & PG_USER_MASK)) { goto do_fault_protect; } /* fall through */ @@ -766,8 +764,7 @@ int x86_cpu_handle_mmu_fault(CPUState *cs, vaddr addr, break; case MMU_KSMAP_IDX: - if (is_write1 != 2 && (env->cr[4] & CR4_SMAP_MASK) && - (pde & PG_USER_MASK)) { + if (is_write1 != 2 && (pde & PG_USER_MASK)) { goto do_fault_protect; } /* fall through */ @@ -823,8 +820,7 @@ int x86_cpu_handle_mmu_fault(CPUState *cs, vaddr addr, break; case MMU_KSMAP_IDX: - if (is_write1 != 2 && (env->cr[4] & CR4_SMAP_MASK) && - (ptep & PG_USER_MASK)) { + if (is_write1 != 2 && (ptep & PG_USER_MASK)) { goto do_fault_protect; } /* fall through */ -- 2.11.4.GIT