[v1,3/3] target: arm: Add support for VCPU event states

Commit Message

Dongjiu Geng May 31, 2018, 11:43 a.m. UTC

This patch extends the qemu-kvm state sync logic with support for
KVM_GET/SET_VCPU_EVENTS, giving access to yet missing SError exception.
And also it can support the exception state migration.

Signed-off-by: Dongjiu Geng <[e-mail]>
---
 target/arm/cpu.h     |  5 ++++
 target/arm/kvm64.c   | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 target/arm/machine.c |  3 +++
 3 files changed, 72 insertions(+)

Patch

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 8488273..b3d6682 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -645,6 +645,11 @@  typedef struct CPUARMState {
     const struct arm_boot_info *boot_info;
     /* Store GICv3CPUState to access from this struct */
     void *gicv3state;
+    struct {
+        uint32_t pending;
+        uint32_t has_esr;
+        uint64_t esr;
+    } serror;
 } CPUARMState;
 
 /**
diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c
index e0b8246..45b6911 100644
--- a/target/arm/kvm64.c
+++ b/target/arm/kvm64.c
@@ -600,6 +600,59 @@  int kvm_arm_cpreg_level(uint64_t regidx)
 #define AARCH64_SIMD_CTRL_REG(x)   (KVM_REG_ARM64 | KVM_REG_SIZE_U32 | \
                  KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(x))
 
+static bool kvm_can_set_vcpu_esr(ARMCPU *cpu)
+{
+    CPUState *cs = CPU(cpu);
+
+    int ret = kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_INJECT_SERROR_ESR);
+    return (ret) ? true : false;
+}
+
+
+static int kvm_put_vcpu_events(ARMCPU *cpu)
+{
+    CPUARMState *env = &cpu->env;
+    struct kvm_vcpu_events events = {};
+
+    if (!kvm_has_vcpu_events()) {
+        return 0;
+    }
+
+    memset(&events, 0, sizeof(events));
+    events.exception.serror_pending = env->serror.pending;
+
+    if (kvm_can_set_vcpu_esr(cpu)) {
+        events.exception.serror_has_esr = env->serror.has_esr;
+        events.exception.serror_esr = env->serror.esr;
+    }
+
+    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_VCPU_EVENTS, &events);
+}
+
+static int kvm_get_vcpu_events(ARMCPU *cpu)
+{
+    CPUARMState *env = &cpu->env;
+    struct kvm_vcpu_events events;
+    int ret;
+
+    if (!kvm_has_vcpu_events()) {
+        return 0;
+    }
+
+    memset(&events, 0, sizeof(events));
+    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_VCPU_EVENTS, &events);
+
+    if (ret < 0) {
+        return ret;
+    }
+
+    env->serror.pending = events.exception.serror_pending;
+    env->serror.has_esr = events.exception.serror_has_esr;
+    env->serror.esr = events.exception.serror_esr;
+
+    return 0;
+}
+
 int kvm_arch_put_registers(CPUState *cs, int level)
 {
     struct kvm_one_reg reg;
@@ -727,6 +780,12 @@  int kvm_arch_put_registers(CPUState *cs, int level)
         return ret;
     }
 
+    ret = kvm_put_vcpu_events(cpu);
+    if (ret) {
+        printf("return error kvm_put_vcpu_events: %d\n", ret);
+        return ret;
+    }
+
     if (!write_list_to_kvmstate(cpu, level)) {
         return EINVAL;
     }
@@ -863,6 +922,11 @@  int kvm_arch_get_registers(CPUState *cs)
     }
     vfp_set_fpcr(env, fpr);
 
+    ret = kvm_get_vcpu_events(cpu);
+    if (ret) {
+        return ret;
+    }
+
     if (!write_kvmstate_to_list(cpu)) {
         return EINVAL;
     }
diff --git a/target/arm/machine.c b/target/arm/machine.c
index 2e28d08..5a359f4 100644
--- a/target/arm/machine.c
+++ b/target/arm/machine.c
@@ -695,6 +695,9 @@  const VMStateDescription vmstate_arm_cpu = {
         VMSTATE_UINT32(env.exception.syndrome, ARMCPU),
         VMSTATE_UINT32(env.exception.fsr, ARMCPU),
         VMSTATE_UINT64(env.exception.vaddress, ARMCPU),
+        VMSTATE_UINT32(env.serror.pending, ARMCPU),
+        VMSTATE_UINT32(env.serror.has_esr, ARMCPU),
+        VMSTATE_UINT64(env.serror.esr, ARMCPU),
         VMSTATE_TIMER_PTR(gt_timer[GTIMER_PHYS], ARMCPU),
         VMSTATE_TIMER_PTR(gt_timer[GTIMER_VIRT], ARMCPU),
         {