[PATCH v3 10/12] target/riscv: Add kvm_riscv_get/put_regs_timer
Add kvm_riscv_get/put_regs_timer to synchronize virtual time context
from KVM.
To set register of RISCV_TIMER_REG(state) will occur a error from KVM
on kvm_timer_state == 0. It's better to adapt in KVM, but it doesn't matter
that adaping in QEMU.
Signed-off-by: Yifei Jiang <jiangyifei(a)huawei.com>
Signed-off-by: Mingwang Li <limingwang(a)huawei.com>
---
target/riscv/cpu.h | 7 +++++
target/riscv/kvm.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 79 insertions(+)
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index e7dba35acb..c892a2c8b7 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -259,6 +259,13 @@ struct CPURISCVState {
hwaddr kernel_addr;
hwaddr fdt_addr;
+
+ /* kvm timer */
+ bool kvm_timer_dirty;
+ uint64_t kvm_timer_time;
+ uint64_t kvm_timer_compare;
+ uint64_t kvm_timer_state;
+ uint64_t kvm_timer_frequency;
};
OBJECT_DECLARE_TYPE(RISCVCPU, RISCVCPUClass,
diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
index 4d08669c81..3c20ec5ad3 100644
--- a/target/riscv/kvm.c
+++ b/target/riscv/kvm.c
@@ -41,6 +41,7 @@
#include "sbi_ecall_interface.h"
#include "chardev/char-fe.h"
#include "semihosting/console.h"
+#include "migration/migration.h"
static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type, uint64_t idx)
{
@@ -65,6 +66,9 @@ static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
uint64_t idx
#define RISCV_CSR_REG(env, name) kvm_riscv_reg_id(env, KVM_REG_RISCV_CSR, \
KVM_REG_RISCV_CSR_REG(name))
+#define RISCV_TIMER_REG(env, name) kvm_riscv_reg_id(env, KVM_REG_RISCV_TIMER, \
+ KVM_REG_RISCV_TIMER_REG(name))
+
#define RISCV_FP_F_REG(env, idx) kvm_riscv_reg_id(env, KVM_REG_RISCV_FP_F, idx)
#define RISCV_FP_D_REG(env, idx) kvm_riscv_reg_id(env, KVM_REG_RISCV_FP_D, idx)
@@ -85,6 +89,22 @@ static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
uint64_t idx
} \
} while(0)
+#define KVM_RISCV_GET_TIMER(cs, env, name, reg) \
+ do { \
+ int ret = kvm_get_one_reg(cs, RISCV_TIMER_REG(env, name), ®); \
+ if (ret) { \
+ abort(); \
+ } \
+ } while(0)
+
+#define KVM_RISCV_SET_TIMER(cs, env, name, reg) \
+ do { \
+ int ret = kvm_set_one_reg(cs, RISCV_TIMER_REG(env, time), ®); \
+ if (ret) { \
+ abort(); \
+ } \
+ } while (0)
+
static int kvm_riscv_get_regs_core(CPUState *cs)
{
int ret = 0;
@@ -236,6 +256,58 @@ static int kvm_riscv_put_regs_fp(CPUState *cs)
return ret;
}
+static void kvm_riscv_get_regs_timer(CPUState *cs)
+{
+ CPURISCVState *env = &RISCV_CPU(cs)->env;
+
+ if (env->kvm_timer_dirty) {
+ return;
+ }
+
+ KVM_RISCV_GET_TIMER(cs, env, time, env->kvm_timer_time);
+ KVM_RISCV_GET_TIMER(cs, env, compare, env->kvm_timer_compare);
+ KVM_RISCV_GET_TIMER(cs, env, state, env->kvm_timer_state);
+ KVM_RISCV_GET_TIMER(cs, env, frequency, env->kvm_timer_frequency);
+
+ env->kvm_timer_dirty = true;
+}
+
+static void kvm_riscv_put_regs_timer(CPUState *cs)
+{
+ uint64_t reg;
+ CPURISCVState *env = &RISCV_CPU(cs)->env;
+
+ if (!env->kvm_timer_dirty) {
+ return;
+ }
+
+ KVM_RISCV_SET_TIMER(cs, env, time, env->kvm_timer_time);
+ KVM_RISCV_SET_TIMER(cs, env, compare, env->kvm_timer_compare);
+
+ /*
+ * To set register of RISCV_TIMER_REG(state) will occur a error from KVM
+ * on env->kvm_timer_state == 0, It's better to adapt in KVM, but it
+ * doesn't matter that adaping in QEMU now.
+ * TODO If KVM changes, adapt here.
+ */
+ if (env->kvm_timer_state) {
+ KVM_RISCV_SET_TIMER(cs, env, state, env->kvm_timer_state);
+ }
+
+ /*
+ * For now, migration will not work between Hosts with different timer
+ * frequency. Therefore, we should check whether they are the same here
+ * during the migration.
+ */
+ if (migration_is_running(migrate_get_current()->state)) {
+ KVM_RISCV_GET_TIMER(cs, env, frequency, reg);
+ if (reg != env->kvm_timer_frequency) {
+ error_report("Dst Hosts timer frequency != Src Hosts");
+ }
+ }
+
+ env->kvm_timer_dirty = false;
+}
const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
KVM_CAP_LAST_INFO
--
2.19.1