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authorAaron Lindsay <aaron@os.amperecomputing.com>2019-01-21 10:23:14 +0000
committerPeter Maydell <peter.maydell@linaro.org>2019-01-21 10:38:55 +0000
commit980ebe87053792a5bdefaa87777c40914fd4f673 (patch)
tree4fe3468b705e4cb39291ef1a45a7dc10411ee684 /target
parent5d05b9d462666ed21b7fef61aa45dec9aaa9f0ff (diff)
target/arm: Swap PMU values before/after migrations
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>
Diffstat (limited to 'target')
-rw-r--r--target/arm/helper.c6
-rw-r--r--target/arm/machine.c24
2 files changed, 28 insertions, 2 deletions
diff --git a/target/arm/helper.c b/target/arm/helper.c
index c49e0d70cb..733cfdc5a0 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 7a22ebc209..b292549614 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[]) {