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target/arm: Create tagged ram when MTE is enabled

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Backports commit 8bce44a2f6beb388a3f157652b46e99929839a96 from qemu
This commit is contained in:
Richard Henderson 2021-02-25 22:51:21 -05:00 committed by Lioncash
parent 2ea0b53c1a
commit 9b6c64f8f8
2 changed files with 34 additions and 4 deletions
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32
qemu/target/arm/cpu.c
View file

@ -1007,16 +1007,40 @@ static int arm_cpu_realizefn(struct uc_struct *uc, DeviceState *dev, Error **err
init_cpreg_list(cpu);
#ifndef CONFIG_USER_ONLY
if (cpu->has_el3 || arm_feature(env, ARM_FEATURE_M_SECURITY)) {
cs->num_ases = 2;
bool has_secure = cpu->has_el3 || arm_feature(env, ARM_FEATURE_M_SECURITY);
/*
* We must set cs->num_ases to the final value before
* the first call to cpu_address_space_init.
*/
if (cpu->tag_memory != NULL) {
cs->num_ases = 3 + has_secure;
} else {
cs->num_ases = 1 + has_secure;
}
if (has_secure) {
if (!cpu->secure_memory) {
cpu->secure_memory = cs->memory;
}
cpu_address_space_init(cs, ARMASIdx_S, "cpu-secure-memory",
cpu->secure_memory);
} else {
cs->num_ases = 1;
}
if (cpu->tag_memory != NULL) {
cpu_address_space_init(cs, ARMASIdx_TagNS, "cpu-tag-memory",
cpu->tag_memory);
if (has_secure) {
cpu_address_space_init(cs, ARMASIdx_TagS, "cpu-tag-memory",
cpu->secure_tag_memory);
}
} else if (cpu_isar_feature(aa64_mte, cpu)) {
/*
* Since there is no tag memory, we can't meaningfully support MTE
* to its fullest. To avoid problems later, when we would come to
* use the tag memory, downgrade support to insns only.
*/
cpu->isar.id_aa64pfr1 =
FIELD_DP64(cpu->isar.id_aa64pfr1, ID_AA64PFR1, MTE, 1);
}
cpu_address_space_init(cs, ARMASIdx_NS, "cpu-memory", cs->memory);

6
qemu/target/arm/cpu.h
View file

@ -771,6 +771,10 @@ struct ARMCPU {
/* MemoryRegion to use for secure physical accesses */
MemoryRegion *secure_memory;
/* MemoryRegion to use for allocation tag accesses */
MemoryRegion *tag_memory;
MemoryRegion *secure_tag_memory;
/* 'compatible' string for this CPU for Linux device trees */
const char *dtb_compatible;
@ -2876,6 +2880,8 @@ int cpu_mmu_index(CPUARMState *env, bool ifetch);
typedef enum ARMASIdx {
ARMASIdx_NS = 0,
ARMASIdx_S = 1,
ARMASIdx_TagNS = 2,
ARMASIdx_TagS = 3,
} ARMASIdx;
/* Return the Exception Level targeted by debug exceptions. */