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[PULL,38/49] target/arm: Swap PMU values before/after migrations

Message ID 20190118145805.6852-39-peter.maydell@linaro.org
State Accepted
Commit 980ebe87053792a5bdefaa87777c40914fd4f673
Headers show
Series target-arm queue | expand

Commit Message

Peter Maydell Jan. 18, 2019, 2:57 p.m. UTC 
From: Aaron Lindsay <aaron@os.amperecomputing.com>


Because of the PMU's design, many register accesses have side effects
which are inter-related, meaning that the normal method of saving CP
registers can result in inconsistent state. These side-effects are
largely handled in pmu_op_start/finish functions which can be called
before and after the state is saved/restored. By doing this and adding
raw read/write functions for the affected registers, we avoid
migration-related inconsistencies.

Signed-off-by: Aaron Lindsay <aclindsa@gmail.com>

Signed-off-by: Aaron Lindsay <aaron@os.amperecomputing.com>

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

Message-id: 20181211151945.29137-4-aaron@os.amperecomputing.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

---
 target/arm/helper.c  |  6 ++++--
 target/arm/machine.c | 24 ++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 2 deletions(-)

-- 
2.20.1
diff mbox series

Patch

diff --git a/target/arm/helper.c b/target/arm/helper.c
index c49e0d70cbb..733cfdc5a0f 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -1459,11 +1459,13 @@  static const ARMCPRegInfo v7_cp_reginfo[] = {
       .opc0 = 3, .opc1 = 3, .crn = 9, .crm = 13, .opc2 = 0,
       .access = PL0_RW, .accessfn = pmreg_access_ccntr,
       .type = ARM_CP_IO,
-      .readfn = pmccntr_read, .writefn = pmccntr_write, },
+      .fieldoffset = offsetof(CPUARMState, cp15.c15_ccnt),
+      .readfn = pmccntr_read, .writefn = pmccntr_write,
+      .raw_readfn = raw_read, .raw_writefn = raw_write, },
 #endif
     { .name = "PMCCFILTR_EL0", .state = ARM_CP_STATE_AA64,
       .opc0 = 3, .opc1 = 3, .crn = 14, .crm = 15, .opc2 = 7,
-      .writefn = pmccfiltr_write,
+      .writefn = pmccfiltr_write, .raw_writefn = raw_write,
       .access = PL0_RW, .accessfn = pmreg_access,
       .type = ARM_CP_IO,
       .fieldoffset = offsetof(CPUARMState, cp15.pmccfiltr_el0),
diff --git a/target/arm/machine.c b/target/arm/machine.c
index 7a22ebc2098..b2925496148 100644
--- a/target/arm/machine.c
+++ b/target/arm/machine.c
@@ -620,6 +620,10 @@  static int cpu_pre_save(void *opaque)
 {
     ARMCPU *cpu = opaque;
 
+    if (!kvm_enabled()) {
+        pmu_op_start(&cpu->env);
+    }
+
     if (kvm_enabled()) {
         if (!write_kvmstate_to_list(cpu)) {
             /* This should never fail */
@@ -641,6 +645,17 @@  static int cpu_pre_save(void *opaque)
     return 0;
 }
 
+static int cpu_post_save(void *opaque)
+{
+    ARMCPU *cpu = opaque;
+
+    if (!kvm_enabled()) {
+        pmu_op_finish(&cpu->env);
+    }
+
+    return 0;
+}
+
 static int cpu_pre_load(void *opaque)
 {
     ARMCPU *cpu = opaque;
@@ -653,6 +668,10 @@  static int cpu_pre_load(void *opaque)
      */
     env->irq_line_state = UINT32_MAX;
 
+    if (!kvm_enabled()) {
+        pmu_op_start(&cpu->env);
+    }
+
     return 0;
 }
 
@@ -721,6 +740,10 @@  static int cpu_post_load(void *opaque, int version_id)
     hw_breakpoint_update_all(cpu);
     hw_watchpoint_update_all(cpu);
 
+    if (!kvm_enabled()) {
+        pmu_op_finish(&cpu->env);
+    }
+
     return 0;
 }
 
@@ -729,6 +752,7 @@  const VMStateDescription vmstate_arm_cpu = {
     .version_id = 22,
     .minimum_version_id = 22,
     .pre_save = cpu_pre_save,
+    .post_save = cpu_post_save,
     .pre_load = cpu_pre_load,
     .post_load = cpu_post_load,
     .fields = (VMStateField[]) {