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target/arm: Honor HCR_EL2.TID1 trapping requirements

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HCR_EL2.TID1 mandates that access from EL1 to REVIDR_EL1, AIDR_EL1
(and their 32bit equivalents) as well as TCMTR, TLBTR are trapped
to EL2. QEMU ignores it, making it harder for a hypervisor to
virtualize the HW (though to be fair, no known hypervisor actually
cares).

Do the right thing by trapping to EL2 if HCR_EL2.TID1 is set.

Backports commit 93fbc983b29a2eb84e2f6065929caf14f99c3681 from qemu
This commit is contained in:
Marc Zyngier 2020-01-07 17:59:56 -05:00 committed by Lioncash
parent d1e981c44b
commit 51062d3fc2
1 changed files with 32 additions and 4 deletions
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36
qemu/target/arm/helper.c
View file

@ -1753,6 +1753,26 @@ static uint64_t isr_read(CPUARMState *env, const ARMCPRegInfo *ri)
return ret;
}
static CPAccessResult access_aa64_tid1(CPUARMState *env, const ARMCPRegInfo *ri,
bool isread)
{
if (arm_current_el(env) == 1 && (arm_hcr_el2_eff(env) & HCR_TID1)) {
return CP_ACCESS_TRAP_EL2;
}
return CP_ACCESS_OK;
}
static CPAccessResult access_aa32_tid1(CPUARMState *env, const ARMCPRegInfo *ri,
bool isread)
{
if (arm_feature(env, ARM_FEATURE_V8)) {
return access_aa64_tid1(env, ri, isread);
}
return CP_ACCESS_OK;
}
static const ARMCPRegInfo v7_cp_reginfo[] = {
/* the old v6 WFI, UNPREDICTABLE in v7 but we choose to NOP */
{ .name = "NOP", .cp = 15, .crn = 7, .crm = 0, .opc1 = 0, .opc2 = 4,
@ -1916,7 +1936,9 @@ static const ARMCPRegInfo v7_cp_reginfo[] = {
*/
{ .name = "AIDR", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 1, .crn = 0, .crm = 0, .opc2 = 7,
.access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0 },
.access = PL1_R, .type = ARM_CP_CONST,
.accessfn = access_aa64_tid1,
.resetvalue = 0 },
/* Auxiliary fault status registers: these also are IMPDEF, and we
* choose to RAZ/WI for all cores.
*/
@ -6523,7 +6545,9 @@ void register_cp_regs_for_features(ARMCPU *cpu)
.access = PL1_R, .resetvalue = cpu->midr },
{ .name = "REVIDR_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 0, .crm = 0, .opc2 = 6,
.access = PL1_R, .type = ARM_CP_CONST, .resetvalue = cpu->revidr },
.access = PL1_R,
.accessfn = access_aa64_tid1,
.type = ARM_CP_CONST, .resetvalue = cpu->revidr },
REGINFO_SENTINEL
};
ARMCPRegInfo id_cp_reginfo[] = {
@ -6539,14 +6563,18 @@ void register_cp_regs_for_features(ARMCPU *cpu)
/* TCMTR and TLBTR exist in v8 but have no 64-bit versions */
{ .name = "TCMTR",
.cp = 15, .crn = 0, .crm = 0, .opc1 = 0, .opc2 = 2,
.access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0 },
.access = PL1_R,
.accessfn = access_aa32_tid1,
.type = ARM_CP_CONST, .resetvalue = 0 },
REGINFO_SENTINEL
};
/* TLBTR is specific to VMSA */
ARMCPRegInfo id_tlbtr_reginfo = {
.name = "TLBTR",
.cp = 15, .crn = 0, .crm = 0, .opc1 = 0, .opc2 = 3,
.access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0,
.access = PL1_R,
.accessfn = access_aa32_tid1,
.type = ARM_CP_CONST, .resetvalue = 0,
};
/* MPUIR is specific to PMSA V6+ */
ARMCPRegInfo id_mpuir_reginfo = {