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[PULL 20/34] target/arm: Honor HCR_EL2.TID2 trapping requirements
From: |
Peter Maydell |
Subject: |
[PULL 20/34] target/arm: Honor HCR_EL2.TID2 trapping requirements |
Date: |
Mon, 16 Dec 2019 11:08:50 +0000 |
From: Marc Zyngier <address@hidden>
HCR_EL2.TID2 mandates that access from EL1 to CTR_EL0, CCSIDR_EL1,
CCSIDR2_EL1, CLIDR_EL1, CSSELR_EL1 are trapped to EL2, and QEMU
completely ignores it, making it impossible for hypervisors to
virtualize the cache hierarchy.
Do the right thing by trapping to EL2 if HCR_EL2.TID2 is set.
Signed-off-by: Marc Zyngier <address@hidden>
Reviewed-by: Edgar E. Iglesias <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
Message-id: address@hidden
Signed-off-by: Peter Maydell <address@hidden>
---
target/arm/helper.c | 31 +++++++++++++++++++++++++++----
1 file changed, 27 insertions(+), 4 deletions(-)
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 0bf8f53d4b8..1e546096b82 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -1910,6 +1910,17 @@ static void scr_write(CPUARMState *env, const
ARMCPRegInfo *ri, uint64_t value)
raw_write(env, ri, value);
}
+static CPAccessResult access_aa64_tid2(CPUARMState *env,
+ const ARMCPRegInfo *ri,
+ bool isread)
+{
+ if (arm_current_el(env) == 1 && (arm_hcr_el2_eff(env) & HCR_TID2)) {
+ return CP_ACCESS_TRAP_EL2;
+ }
+
+ return CP_ACCESS_OK;
+}
+
static uint64_t ccsidr_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
ARMCPU *cpu = env_archcpu(env);
@@ -2110,10 +2121,14 @@ static const ARMCPRegInfo v7_cp_reginfo[] = {
.writefn = pmintenclr_write },
{ .name = "CCSIDR", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .crn = 0, .crm = 0, .opc1 = 1, .opc2 = 0,
- .access = PL1_R, .readfn = ccsidr_read, .type = ARM_CP_NO_RAW },
+ .access = PL1_R,
+ .accessfn = access_aa64_tid2,
+ .readfn = ccsidr_read, .type = ARM_CP_NO_RAW },
{ .name = "CSSELR", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .crn = 0, .crm = 0, .opc1 = 2, .opc2 = 0,
- .access = PL1_RW, .writefn = csselr_write, .resetvalue = 0,
+ .access = PL1_RW,
+ .accessfn = access_aa64_tid2,
+ .writefn = csselr_write, .resetvalue = 0,
.bank_fieldoffsets = { offsetof(CPUARMState, cp15.csselr_s),
offsetof(CPUARMState, cp15.csselr_ns) } },
/* Auxiliary ID register: this actually has an IMPDEF value but for now
@@ -5204,6 +5219,11 @@ static CPAccessResult ctr_el0_access(CPUARMState *env,
const ARMCPRegInfo *ri,
if (arm_current_el(env) == 0 && !(env->cp15.sctlr_el[1] & SCTLR_UCT)) {
return CP_ACCESS_TRAP;
}
+
+ if (arm_current_el(env) < 2 && arm_hcr_el2_eff(env) & HCR_TID2) {
+ return CP_ACCESS_TRAP_EL2;
+ }
+
return CP_ACCESS_OK;
}
@@ -6184,7 +6204,9 @@ void register_cp_regs_for_features(ARMCPU *cpu)
ARMCPRegInfo clidr = {
.name = "CLIDR", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .crn = 0, .crm = 0, .opc1 = 1, .opc2 = 1,
- .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = cpu->clidr
+ .access = PL1_R, .type = ARM_CP_CONST,
+ .accessfn = access_aa64_tid2,
+ .resetvalue = cpu->clidr
};
define_one_arm_cp_reg(cpu, &clidr);
define_arm_cp_regs(cpu, v7_cp_reginfo);
@@ -6717,7 +6739,8 @@ void register_cp_regs_for_features(ARMCPU *cpu)
/* These are common to v8 and pre-v8 */
{ .name = "CTR",
.cp = 15, .crn = 0, .crm = 0, .opc1 = 0, .opc2 = 1,
- .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = cpu->ctr },
+ .access = PL1_R, .accessfn = ctr_el0_access,
+ .type = ARM_CP_CONST, .resetvalue = cpu->ctr },
{ .name = "CTR_EL0", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 3, .opc2 = 1, .crn = 0, .crm = 0,
.access = PL0_R, .accessfn = ctr_el0_access,
--
2.20.1
- [PULL 12/34] aspeed/smc: Restore default AHB window mapping at reset, (continued)
- [PULL 12/34] aspeed/smc: Restore default AHB window mapping at reset, Peter Maydell, 2019/12/16
- [PULL 10/34] watchdog/aspeed: Improve watchdog timeout message, Peter Maydell, 2019/12/16
- [PULL 11/34] watchdog/aspeed: Fix AST2600 frequency behaviour, Peter Maydell, 2019/12/16
- [PULL 13/34] aspeed/smc: Do not map disabled segment on the AST2600, Peter Maydell, 2019/12/16
- [PULL 14/34] aspeed/smc: Add AST2600 timings registers, Peter Maydell, 2019/12/16
- [PULL 16/34] aspeed: Add support for the tacoma-bmc board, Peter Maydell, 2019/12/16
- [PULL 15/34] aspeed: Remove AspeedBoardConfig array and use AspeedMachineClass, Peter Maydell, 2019/12/16
- [PULL 17/34] gpio: fix memory leak in aspeed_gpio_init(), Peter Maydell, 2019/12/16
- [PULL 18/34] aspeed: Change the "scu" property definition, Peter Maydell, 2019/12/16
- [PULL 19/34] aspeed: Change the "nic" property definition, Peter Maydell, 2019/12/16
- [PULL 20/34] target/arm: Honor HCR_EL2.TID2 trapping requirements,
Peter Maydell <=
- [PULL 21/34] target/arm: Honor HCR_EL2.TID1 trapping requirements, Peter Maydell, 2019/12/16
- [PULL 22/34] target/arm: Handle trapping to EL2 of AArch32 VMRS instructions, Peter Maydell, 2019/12/16
- [PULL 23/34] target/arm: Handle AArch32 CP15 trapping via HSTR_EL2, Peter Maydell, 2019/12/16
- [PULL 24/34] target/arm: Add support for missing Jazelle system registers, Peter Maydell, 2019/12/16
- [PULL 25/34] arm/arm-powerctl: set NSACR.{CP11, CP10} bits in arm_set_cpu_on(), Peter Maydell, 2019/12/16
- [PULL 26/34] tcg: cputlb: Add probe_read, Peter Maydell, 2019/12/16
- [PULL 28/34] migration: ram: Switch to ram block writeback, Peter Maydell, 2019/12/16
- [PULL 29/34] target/arm: Add support for DC CVAP & DC CVADP ins, Peter Maydell, 2019/12/16
- [PULL 30/34] hw/arm/sbsa-ref: Simplify by moving the gic in the machine state, Peter Maydell, 2019/12/16
- [PULL 32/34] hw/arm/acpi: enable SHPC native hot plug, Peter Maydell, 2019/12/16