target/i386: emulate: raise an exception on translation fault
Signed-off-by: Mohamed Mediouni <mohamed@unpredictable.fr> Link: https://lore.kernel.org/r/20260223233950.96076-23-mohamed@unpredictable.fr Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Mohamed Mediouni committed
Feb 24, 2026 at 00:39 UTC
a998be992651c5ea4165539819f982641c23b6ba
1 file changed
+30
target/i386/emulate/x86_mmu.c
+30
@@ -240,8 +240,29 @@ MMUTranslateResult mmu_gva_to_gpa(CPUState *cpu, target_ulong gva, uint64_t *gpa
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return res;
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}
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+static int translate_res_to_error_code(MMUTranslateResult res, bool is_write, bool is_user)
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+{
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+ int error_code = 0;
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+ if (is_user) {
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+ error_code |= PG_ERROR_U_MASK;
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+ }
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+ if (!(res & MMU_TRANSLATE_PAGE_NOT_MAPPED)) {
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+ error_code |= PG_ERROR_P_MASK;
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+ }
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+ if (is_write && (res & MMU_TRANSLATE_PRIV_VIOLATION)) {
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+ error_code |= PG_ERROR_W_MASK;
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+ }
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+ if (res & MMU_TRANSLATE_INVALID_PT_FLAGS) {
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+ error_code |= PG_ERROR_RSVD_MASK;
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+ }
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+ return error_code;
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+}
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+
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static MMUTranslateResult x86_write_mem_ex(CPUState *cpu, void *data, target_ulong gva, int bytes, bool priv_check_exempt)
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{
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+ X86CPU *x86_cpu = X86_CPU(cpu);
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+ CPUX86State *env = &x86_cpu->env;
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+
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MMUTranslateResult translate_res = MMU_TRANSLATE_SUCCESS;
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MemTxResult mem_tx_res;
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uint64_t gpa;
@@ -252,6 +273,9 @@ static MMUTranslateResult x86_write_mem_ex(CPUState *cpu, void *data, target_ulo
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translate_res = mmu_gva_to_gpa(cpu, gva, &gpa, MMU_TRANSLATE_VALIDATE_WRITE);
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if (translate_res) {
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+ int error_code = translate_res_to_error_code(translate_res, true, is_user(cpu));
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+ env->cr[2] = gva;
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+ x86_emul_raise_exception(env, EXCP0E_PAGE, error_code);
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return translate_res;
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}
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@@ -284,6 +308,9 @@ MMUTranslateResult x86_write_mem_priv(CPUState *cpu, void *data, target_ulong gv
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static MMUTranslateResult x86_read_mem_ex(CPUState *cpu, void *data, target_ulong gva, int bytes, bool priv_check_exempt)
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{
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+ X86CPU *x86_cpu = X86_CPU(cpu);
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+ CPUX86State *env = &x86_cpu->env;
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+
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MMUTranslateResult translate_res = MMU_TRANSLATE_SUCCESS;
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MemTxResult mem_tx_res;
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uint64_t gpa;
@@ -294,6 +321,9 @@ static MMUTranslateResult x86_read_mem_ex(CPUState *cpu, void *data, target_ulon
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translate_res = mmu_gva_to_gpa(cpu, gva, &gpa, 0);
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if (translate_res) {
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+ int error_code = translate_res_to_error_code(translate_res, false, is_user(cpu));
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+ env->cr[2] = gva;
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+ x86_emul_raise_exception(env, EXCP0E_PAGE, error_code);
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return translate_res;
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}
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mem_tx_res = address_space_read(&address_space_memory, gpa, MEMTXATTRS_UNSPECIFIED,