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target/arm: Implement data cache set allocation tags

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This is DC GVA and DC GZVA, and the tag check for DC ZVA.

Backports commit eb821168db798302bd124a3b000cebc23bd0a395 from qemu
This commit is contained in:
Richard Henderson 2021-02-25 22:40:07 -05:00 committed by Lioncash
parent 33f5bdabb1
commit 35d0443056
3 changed files with 58 additions and 1 deletions
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4
qemu/target/arm/cpu.h
View file

@ -2246,7 +2246,9 @@ static inline uint64_t cpreg_to_kvm_id(uint32_t cpregid)
#define ARM_CP_NZCV (ARM_CP_SPECIAL | 0x0300)
#define ARM_CP_CURRENTEL (ARM_CP_SPECIAL | 0x0400)
#define ARM_CP_DC_ZVA (ARM_CP_SPECIAL | 0x0500)
#define ARM_LAST_SPECIAL ARM_CP_DC_ZVA
#define ARM_CP_DC_GVA (ARM_CP_SPECIAL | 0x0600)
#define ARM_CP_DC_GZVA (ARM_CP_SPECIAL | 0x0700)
#define ARM_LAST_SPECIAL ARM_CP_DC_GZVA
#define ARM_CP_FPU 0x1000
#define ARM_CP_SVE 0x2000
#define ARM_CP_NO_GDB 0x4000

16
qemu/target/arm/helper.c
View file

@ -6700,6 +6700,22 @@ static const ARMCPRegInfo mte_el0_cacheop_reginfo[] = {
.opc0 = 1, .opc1 = 3, .crn = 7, .crm = 14, .opc2 = 5,
.type = ARM_CP_NOP, .access = PL0_W,
.accessfn = aa64_cacheop_poc_access },
{ .name = "DC_GVA", .state = ARM_CP_STATE_AA64,
.opc0 = 1, .opc1 = 3, .crn = 7, .crm = 4, .opc2 = 3,
.access = PL0_W, .type = ARM_CP_DC_GVA,
#ifndef CONFIG_USER_ONLY
/* Avoid overhead of an access check that always passes in user-mode */
.accessfn = aa64_zva_access,
#endif
},
{ .name = "DC_GZVA", .state = ARM_CP_STATE_AA64,
.opc0 = 1, .opc1 = 3, .crn = 7, .crm = 4, .opc2 = 4,
.access = PL0_W, .type = ARM_CP_DC_GZVA,
#ifndef CONFIG_USER_ONLY
/* Avoid overhead of an access check that always passes in user-mode */
.accessfn = aa64_zva_access,
#endif
},
REGINFO_SENTINEL
};

39
qemu/target/arm/translate-a64.c
View file

@ -2063,6 +2063,45 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
}
gen_helper_dc_zva(tcg_ctx, tcg_ctx->cpu_env, tcg_rt);
return;
case ARM_CP_DC_GVA:
{
TCGv_i64 clean_addr, tag;
/*
* DC_GVA, like DC_ZVA, requires that we supply the original
* pointer for an invalid page. Probe that address first.
*/
tcg_rt = cpu_reg(s, rt);
clean_addr = clean_data_tbi(s, tcg_rt);
gen_probe_access(s, clean_addr, MMU_DATA_STORE, MO_8);
if (s->ata) {
/* Extract the tag from the register to match STZGM. */
tag = tcg_temp_new_i64(tcg_ctx);
tcg_gen_shri_i64(tcg_ctx, tag, tcg_rt, 56);
gen_helper_stzgm_tags(tcg_ctx, tcg_ctx->cpu_env, clean_addr, tag);
tcg_temp_free_i64(tcg_ctx, tag);
}
}
return;
case ARM_CP_DC_GZVA:
{
TCGv_i64 clean_addr, tag;
/* For DC_GZVA, we can rely on DC_ZVA for the proper fault. */
tcg_rt = cpu_reg(s, rt);
clean_addr = clean_data_tbi(s, tcg_rt);
gen_helper_dc_zva(tcg_ctx, tcg_ctx->cpu_env, clean_addr);
if (s->ata) {
/* Extract the tag from the register to match STZGM. */
tag = tcg_temp_new_i64(tcg_ctx);
tcg_gen_shri_i64(tcg_ctx, tag, tcg_rt, 56);
gen_helper_stzgm_tags(tcg_ctx, tcg_ctx->cpu_env, clean_addr, tag);
tcg_temp_free_i64(tcg_ctx, tag);
}
}
return;
default:
break;
}