[PATCH] target/arm: Honor the HCR_EL2.TSW bit

[PATCH] target/arm: Honor the HCR_EL2.TSW bit

[Richard Henderson]

These bits trap EL1 access to set/way cache maintenance insns.

Buglink: https://bugs.launchpad.net/bugs/1863685
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

Based-on: <20200218152844.29351-1-richard.henderson@linaro.org>
("target/arm: Honor the HCR_EL2.{TVM,TRVM} bits")

Not really dependent on the above, but there will be a
trivial patch conflict without it.


r~

---
 target/arm/helper.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 69946a57f8..b87518b97a 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -542,6 +542,16 @@ static CPAccessResult access_tvm_trvm(CPUARMState *env, const ARMCPRegInfo *ri,
     return CP_ACCESS_OK;
 }
 
+/* Check for traps from EL1 due to HCR_EL2.TSW.  */
+static CPAccessResult access_tsw(CPUARMState *env, const ARMCPRegInfo *ri,
+                                 bool isread)
+{
+    if (arm_current_el(env) == 1 && (arm_hcr_el2_eff(env) & HCR_TSW)) {
+        return CP_ACCESS_TRAP_EL2;
+    }
+    return CP_ACCESS_OK;
+}
+
 static void dacr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
 {
     ARMCPU *cpu = env_archcpu(env);
@@ -4659,14 +4669,14 @@ static const ARMCPRegInfo v8_cp_reginfo[] = {
       .access = PL1_W, .type = ARM_CP_NOP },
     { .name = "DC_ISW", .state = ARM_CP_STATE_AA64,
       .opc0 = 1, .opc1 = 0, .crn = 7, .crm = 6, .opc2 = 2,
-      .access = PL1_W, .type = ARM_CP_NOP },
+      .access = PL1_W, .accessfn = access_tsw, .type = ARM_CP_NOP },
     { .name = "DC_CVAC", .state = ARM_CP_STATE_AA64,
       .opc0 = 1, .opc1 = 3, .crn = 7, .crm = 10, .opc2 = 1,
       .access = PL0_W, .type = ARM_CP_NOP,
       .accessfn = aa64_cacheop_access },
     { .name = "DC_CSW", .state = ARM_CP_STATE_AA64,
       .opc0 = 1, .opc1 = 0, .crn = 7, .crm = 10, .opc2 = 2,
-      .access = PL1_W, .type = ARM_CP_NOP },
+      .access = PL1_W, .accessfn = access_tsw, .type = ARM_CP_NOP },
     { .name = "DC_CVAU", .state = ARM_CP_STATE_AA64,
       .opc0 = 1, .opc1 = 3, .crn = 7, .crm = 11, .opc2 = 1,
       .access = PL0_W, .type = ARM_CP_NOP,
@@ -4677,7 +4687,7 @@ static const ARMCPRegInfo v8_cp_reginfo[] = {
       .accessfn = aa64_cacheop_access },
     { .name = "DC_CISW", .state = ARM_CP_STATE_AA64,
       .opc0 = 1, .opc1 = 0, .crn = 7, .crm = 14, .opc2 = 2,
-      .access = PL1_W, .type = ARM_CP_NOP },
+      .access = PL1_W, .accessfn = access_tsw, .type = ARM_CP_NOP },
     /* TLBI operations */
     { .name = "TLBI_VMALLE1IS", .state = ARM_CP_STATE_AA64,
       .opc0 = 1, .opc1 = 0, .crn = 8, .crm = 3, .opc2 = 0,
@@ -4858,17 +4868,17 @@ static const ARMCPRegInfo v8_cp_reginfo[] = {
     { .name = "DCIMVAC", .cp = 15, .opc1 = 0, .crn = 7, .crm = 6, .opc2 = 1,
       .type = ARM_CP_NOP, .access = PL1_W },
     { .name = "DCISW", .cp = 15, .opc1 = 0, .crn = 7, .crm = 6, .opc2 = 2,
-      .type = ARM_CP_NOP, .access = PL1_W },
+      .type = ARM_CP_NOP, .access = PL1_W, .accessfn = access_tsw },
     { .name = "DCCMVAC", .cp = 15, .opc1 = 0, .crn = 7, .crm = 10, .opc2 = 1,
       .type = ARM_CP_NOP, .access = PL1_W },
     { .name = "DCCSW", .cp = 15, .opc1 = 0, .crn = 7, .crm = 10, .opc2 = 2,
-      .type = ARM_CP_NOP, .access = PL1_W },
+      .type = ARM_CP_NOP, .access = PL1_W, .accessfn = access_tsw },
     { .name = "DCCMVAU", .cp = 15, .opc1 = 0, .crn = 7, .crm = 11, .opc2 = 1,
       .type = ARM_CP_NOP, .access = PL1_W },
     { .name = "DCCIMVAC", .cp = 15, .opc1 = 0, .crn = 7, .crm = 14, .opc2 = 1,
       .type = ARM_CP_NOP, .access = PL1_W },
     { .name = "DCCISW", .cp = 15, .opc1 = 0, .crn = 7, .crm = 14, .opc2 = 2,
-      .type = ARM_CP_NOP, .access = PL1_W },
+      .type = ARM_CP_NOP, .access = PL1_W, .accessfn = access_tsw },
     /* MMU Domain access control / MPU write buffer control */
     { .name = "DACR", .cp = 15, .opc1 = 0, .crn = 3, .crm = 0, .opc2 = 0,
       .access = PL1_RW, .accessfn = access_tvm_trvm, .resetvalue = 0,
-- 
2.20.1