From: Marc Zyngier <maz@kernel.org>
To: qemu-devel@nongnu.org
Cc: Peter Maydell <peter.maydell@linaro.org>,
richard.henderson@linaro.org, kvmarm@lists.cs.columbia.edu
Subject: [PATCH 1/3] target/arm: Honor HCR_EL2.TID2 trapping requirements
Date: Thu, 28 Nov 2019 16:17:16 +0000 [thread overview]
Message-ID: <20191128161718.24361-2-maz@kernel.org> (raw)
In-Reply-To: <20191128161718.24361-1-maz@kernel.org>
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 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 <maz@kernel.org>
---
target/arm/helper.c | 28 +++++++++++++++++++++++++---
1 file changed, 25 insertions(+), 3 deletions(-)
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 0bf8f53d4b..0b6887b100 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_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);
--
2.20.1
next prev parent reply other threads:[~2019-11-28 17:56 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-28 16:17 [PATCH 0/3] target/arm: More HCR_EL2.TIDx fixes Marc Zyngier
2019-11-28 16:17 ` Marc Zyngier [this message]
2019-11-29 7:53 ` [PATCH 1/3] target/arm: Honor HCR_EL2.TID2 trapping requirements Edgar E. Iglesias
2019-11-28 16:17 ` [PATCH 2/3] target/arm: Honor HCR_EL2.TID1 " Marc Zyngier
2019-11-29 8:00 ` Edgar E. Iglesias
2019-11-28 16:17 ` [PATCH 3/3] target/arm: Handle trapping to EL2 of AArch32 VMRS instructions Marc Zyngier
2019-11-28 16:43 ` Peter Maydell
2019-11-28 17:49 ` Marc Zyngier
2019-11-28 18:06 ` Peter Maydell
2019-11-29 8:28 ` Edgar E. Iglesias
2019-11-29 9:24 ` Marc Zyngier
2019-11-29 9:45 ` Edgar E. Iglesias
2019-11-29 9:51 ` Peter Maydell
2019-11-28 16:30 ` [PATCH 0/3] target/arm: More HCR_EL2.TIDx fixes Peter Maydell
2019-11-28 16:35 ` Marc Zyngier
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