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authorPeter Maydell <peter.maydell@linaro.org>2013-05-09 11:35:35 +0100
committerPeter Maydell <peter.maydell@linaro.org>2013-05-13 15:19:35 +0100
commit2eac8557d92d0c21386394a76a1fdb34aa0c63d2 (patch)
treefe6acd993bb9e57092f5f72f21140cf31884f658
parent2d2d74ee0a3b801fbf2d90e640e248f52f32da2f (diff)
downloadqemu-arm-2eac8557d92d0c21386394a76a1fdb34aa0c63d2.tar.gz
target-arm: Reinitialize all KVM VCPU registers on reset
Since the ARM KVM API doesn't include a "reset this VCPU" ioctl, we have to capture the initial values of every register it knows about so that we can reset the VCPU by feeding those values back again. Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--target-arm/cpu-qom.h6
-rw-r--r--target-arm/kvm.c16
2 files changed, 21 insertions, 1 deletions
diff --git a/target-arm/cpu-qom.h b/target-arm/cpu-qom.h
index 2242eee514..25239b8952 100644
--- a/target-arm/cpu-qom.h
+++ b/target-arm/cpu-qom.h
@@ -72,7 +72,11 @@ typedef struct ARMCPU {
uint64_t *cpreg_indexes;
/* Values of the registers (cpreg_indexes[i]'s value is cpreg_values[i]) */
uint64_t *cpreg_values;
- /* Length of the indexes, values arrays */
+ /* When using KVM, keeps a copy of the initial state of the VCPU,
+ * so that on reset we can feed the reset values back into the kernel.
+ */
+ uint64_t *cpreg_reset_values;
+ /* Length of the indexes, values, reset_values arrays */
int32_t cpreg_array_len;
/* These are used only for migration: incoming data arrives in
* these fields and is sanity checked in post_load before copying
diff --git a/target-arm/kvm.c b/target-arm/kvm.c
index b9c9127d9c..5c91ab756a 100644
--- a/target-arm/kvm.c
+++ b/target-arm/kvm.c
@@ -162,6 +162,13 @@ int kvm_arch_init_vcpu(CPUState *cs)
goto out;
}
+ /* Save a copy of the initial register values so that we can
+ * feed it back to the kernel on VCPU reset.
+ */
+ cpu->cpreg_reset_values = g_memdup(cpu->cpreg_values,
+ cpu->cpreg_array_len *
+ sizeof(cpu->cpreg_values[0]));
+
out:
g_free(rlp);
return ret;
@@ -566,6 +573,15 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
void kvm_arch_reset_vcpu(CPUState *cs)
{
+ /* Feed the kernel back its initial register state */
+ ARMCPU *cpu = ARM_CPU(cs);
+
+ memmove(cpu->cpreg_values, cpu->cpreg_reset_values,
+ cpu->cpreg_array_len * sizeof(cpu->cpreg_values[0]));
+
+ if (!write_list_to_kvmstate(cpu)) {
+ abort();
+ }
}
bool kvm_arch_stop_on_emulation_error(CPUState *cs)