target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++ target/riscv/kvm_riscv.h | 1 + 2 files changed, 43 insertions(+)
From: "liguang.zhang" <liguang.zhang@hexintek.com>
Fix the guest reboot error when using KVM
There are two issues when rebooting a guest using KVM
1. When the guest initiates a reboot the host is unable to stop the vcpu
2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
This can be fixed by clearing the CSR values at reset and syncing the
MPSTATE with the host.
Signed-off-by: liguang.zhang <liguang.zhang@hexintek.com>
---
target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++
target/riscv/kvm_riscv.h | 1 +
2 files changed, 43 insertions(+)
diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
index 9d8a8982f9..ecc8ab8238 100644
--- a/target/riscv/kvm.c
+++ b/target/riscv/kvm.c
@@ -44,6 +44,8 @@
#include "migration/migration.h"
#include "sysemu/runstate.h"
+static bool cap_has_mp_state;
+
static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
uint64_t idx)
{
@@ -790,6 +792,24 @@ int kvm_arch_get_registers(CPUState *cs)
return ret;
}
+int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state)
+{
+ if (cap_has_mp_state) {
+ struct kvm_mp_state mp_state = {
+ .mp_state = state
+ };
+
+ int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
+ if (ret) {
+ fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n",
+ __func__, ret, strerror(-ret));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
int kvm_arch_put_registers(CPUState *cs, int level)
{
int ret = 0;
@@ -809,6 +829,18 @@ int kvm_arch_put_registers(CPUState *cs, int level)
return ret;
}
+ if (KVM_PUT_RESET_STATE == level) {
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ if (cs->cpu_index == 0) {
+ ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE);
+ } else {
+ ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED);
+ }
+ if (ret) {
+ return ret;
+ }
+ }
+
return ret;
}
@@ -909,6 +941,7 @@ int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
int kvm_arch_init(MachineState *ms, KVMState *s)
{
+ cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
return 0;
}
@@ -987,10 +1020,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
if (!kvm_enabled()) {
return;
}
+ for (int i=0; i<32; i++)
+ env->gpr[i] = 0;
env->pc = cpu->env.kernel_addr;
env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
env->gpr[11] = cpu->env.fdt_addr; /* a1 */
env->satp = 0;
+ env->mie = 0;
+ env->stvec = 0;
+ env->sscratch = 0;
+ env->sepc = 0;
+ env->scause = 0;
+ env->stval = 0;
+ env->mip = 0;
}
void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
index e3ba935808..3ea68c38e3 100644
--- a/target/riscv/kvm_riscv.h
+++ b/target/riscv/kvm_riscv.h
@@ -22,5 +22,6 @@
void kvm_riscv_init_user_properties(Object *cpu_obj);
void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level);
+int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
#endif
--
2.17.1On Tue, Jul 18, 2023 at 10:22 PM liguang.zhang <18622748025@163.com> wrote:
>
> From: "liguang.zhang" <liguang.zhang@hexintek.com>
>
> Fix the guest reboot error when using KVM
> There are two issues when rebooting a guest using KVM
> 1. When the guest initiates a reboot the host is unable to stop the vcpu
> 2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
>
> This can be fixed by clearing the CSR values at reset and syncing the
> MPSTATE with the host.
>
> Signed-off-by: liguang.zhang <liguang.zhang@hexintek.com>
Thanks!
When sending new versions of patches please increment the patch
version: https://www.qemu.org/docs/master/devel/submitting-a-patch.html#when-resending-patches-add-a-version-tag
The patch looks good, but don't we need an equivalent for the get register call?
Alistair
> ---
> target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++
> target/riscv/kvm_riscv.h | 1 +
> 2 files changed, 43 insertions(+)
>
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index 9d8a8982f9..ecc8ab8238 100644
> --- a/target/riscv/kvm.c
> +++ b/target/riscv/kvm.c
> @@ -44,6 +44,8 @@
> #include "migration/migration.h"
> #include "sysemu/runstate.h"
>
> +static bool cap_has_mp_state;
> +
> static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
> uint64_t idx)
> {
> @@ -790,6 +792,24 @@ int kvm_arch_get_registers(CPUState *cs)
> return ret;
> }
>
> +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state)
> +{
> + if (cap_has_mp_state) {
> + struct kvm_mp_state mp_state = {
> + .mp_state = state
> + };
> +
> + int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
> + if (ret) {
> + fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n",
> + __func__, ret, strerror(-ret));
> + return -1;
> + }
> + }
> +
> + return 0;
> +}
> +
> int kvm_arch_put_registers(CPUState *cs, int level)
> {
> int ret = 0;
> @@ -809,6 +829,18 @@ int kvm_arch_put_registers(CPUState *cs, int level)
> return ret;
> }
>
> + if (KVM_PUT_RESET_STATE == level) {
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + if (cs->cpu_index == 0) {
> + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE);
> + } else {
> + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED);
> + }
> + if (ret) {
> + return ret;
> + }
> + }
> +
> return ret;
> }
>
> @@ -909,6 +941,7 @@ int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
>
> int kvm_arch_init(MachineState *ms, KVMState *s)
> {
> + cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
> return 0;
> }
>
> @@ -987,10 +1020,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
> if (!kvm_enabled()) {
> return;
> }
> + for (int i=0; i<32; i++)
> + env->gpr[i] = 0;
> env->pc = cpu->env.kernel_addr;
> env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
> env->gpr[11] = cpu->env.fdt_addr; /* a1 */
> env->satp = 0;
> + env->mie = 0;
> + env->stvec = 0;
> + env->sscratch = 0;
> + env->sepc = 0;
> + env->scause = 0;
> + env->stval = 0;
> + env->mip = 0;
> }
>
> void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
> diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
> index e3ba935808..3ea68c38e3 100644
> --- a/target/riscv/kvm_riscv.h
> +++ b/target/riscv/kvm_riscv.h
> @@ -22,5 +22,6 @@
> void kvm_riscv_init_user_properties(Object *cpu_obj);
> void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
> void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level);
> +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
>
> #endif
> --
> 2.17.1
>
From: "liguang.zhang" <liguang.zhang@hexintek.com>
Fix the guest reboot error when using KVM
There are two issues when rebooting a guest using KVM
1. When the guest initiates a reboot the host is unable to stop the vcpu
2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
This can be fixed by clearing the CSR values at reset and syncing the
MPSTATE with the host.
Signed-off-by: liguang.zhang <liguang.zhang@hexintek.com>
---
target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++
target/riscv/kvm_riscv.h | 1 +
2 files changed, 43 insertions(+)
diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
index 9d8a8982f9..ecc8ab8238 100644
--- a/target/riscv/kvm.c
+++ b/target/riscv/kvm.c
@@ -44,6 +44,8 @@
#include "migration/migration.h"
#include "sysemu/runstate.h"
+static bool cap_has_mp_state;
+
static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
uint64_t idx)
{
@@ -790,6 +792,24 @@ int kvm_arch_get_registers(CPUState *cs)
return ret;
}
+int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state)
+{
+ if (cap_has_mp_state) {
+ struct kvm_mp_state mp_state = {
+ .mp_state = state
+ };
+
+ int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
+ if (ret) {
+ fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n",
+ __func__, ret, strerror(-ret));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
int kvm_arch_put_registers(CPUState *cs, int level)
{
int ret = 0;
@@ -809,6 +829,18 @@ int kvm_arch_put_registers(CPUState *cs, int level)
return ret;
}
+ if (KVM_PUT_RESET_STATE == level) {
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ if (cs->cpu_index == 0) {
+ ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE);
+ } else {
+ ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED);
+ }
+ if (ret) {
+ return ret;
+ }
+ }
+
return ret;
}
@@ -909,6 +941,7 @@ int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
int kvm_arch_init(MachineState *ms, KVMState *s)
{
+ cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
return 0;
}
@@ -987,10 +1020,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
if (!kvm_enabled()) {
return;
}
+ for (int i=0; i<32; i++)
+ env->gpr[i] = 0;
env->pc = cpu->env.kernel_addr;
env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
env->gpr[11] = cpu->env.fdt_addr; /* a1 */
env->satp = 0;
+ env->mie = 0;
+ env->stvec = 0;
+ env->sscratch = 0;
+ env->sepc = 0;
+ env->scause = 0;
+ env->stval = 0;
+ env->mip = 0;
}
void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
index e3ba935808..3ea68c38e3 100644
--- a/target/riscv/kvm_riscv.h
+++ b/target/riscv/kvm_riscv.h
@@ -22,5 +22,6 @@
void kvm_riscv_init_user_properties(Object *cpu_obj);
void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level);
+int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
#endif
--
2.41.0On Mon, Jul 24, 2023 at 2:26 AM liguang.zhang <18622748025@163.com> wrote:
>
> From: "liguang.zhang" <liguang.zhang@hexintek.com>
>
> Fix the guest reboot error when using KVM
> There are two issues when rebooting a guest using KVM
> 1. When the guest initiates a reboot the host is unable to stop the vcpu
> 2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
>
> This can be fixed by clearing the CSR values at reset and syncing the
> MPSTATE with the host.
>
> Signed-off-by: liguang.zhang <liguang.zhang@hexintek.com>
> ---
> target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++
> target/riscv/kvm_riscv.h | 1 +
> 2 files changed, 43 insertions(+)
>
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index 9d8a8982f9..ecc8ab8238 100644
> --- a/target/riscv/kvm.c
> +++ b/target/riscv/kvm.c
> @@ -44,6 +44,8 @@
> #include "migration/migration.h"
> #include "sysemu/runstate.h"
>
> +static bool cap_has_mp_state;
> +
> static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
> uint64_t idx)
> {
> @@ -790,6 +792,24 @@ int kvm_arch_get_registers(CPUState *cs)
> return ret;
> }
>
> +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state)
> +{
> + if (cap_has_mp_state) {
> + struct kvm_mp_state mp_state = {
> + .mp_state = state
> + };
> +
> + int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
> + if (ret) {
> + fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n",
> + __func__, ret, strerror(-ret));
> + return -1;
> + }
> + }
> +
> + return 0;
> +}
> +
> int kvm_arch_put_registers(CPUState *cs, int level)
> {
> int ret = 0;
> @@ -809,6 +829,18 @@ int kvm_arch_put_registers(CPUState *cs, int level)
> return ret;
> }
>
> + if (KVM_PUT_RESET_STATE == level) {
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + if (cs->cpu_index == 0) {
> + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE);
> + } else {
> + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED);
> + }
> + if (ret) {
> + return ret;
> + }
> + }
You are adding code to kvm_arch_put_registers() don't you also need to
add code to kvm_arch_get_registers()? and a *_mpstate_to_qemu()
function to match?
Alistair
> +
> return ret;
> }
>
> @@ -909,6 +941,7 @@ int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
>
> int kvm_arch_init(MachineState *ms, KVMState *s)
> {
> + cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
> return 0;
> }
>
> @@ -987,10 +1020,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
> if (!kvm_enabled()) {
> return;
> }
> + for (int i=0; i<32; i++)
> + env->gpr[i] = 0;
> env->pc = cpu->env.kernel_addr;
> env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
> env->gpr[11] = cpu->env.fdt_addr; /* a1 */
> env->satp = 0;
> + env->mie = 0;
> + env->stvec = 0;
> + env->sscratch = 0;
> + env->sepc = 0;
> + env->scause = 0;
> + env->stval = 0;
> + env->mip = 0;
> }
>
> void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
> diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
> index e3ba935808..3ea68c38e3 100644
> --- a/target/riscv/kvm_riscv.h
> +++ b/target/riscv/kvm_riscv.h
> @@ -22,5 +22,6 @@
> void kvm_riscv_init_user_properties(Object *cpu_obj);
> void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
> void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level);
> +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
>
> #endif
> --
> 2.41.0
>
From: "liguang.zhang" <liguang.zhang@hexintek.com>
> On Mon, Jul 24, 2023 at 2:26 AM liguang.zhang <18622748...@163.com> wrote:
> >
> > From: "liguang.zhang" <liguang.zh...@hexintek.com>
> >
> > Fix the guest reboot error when using KVM
> > There are two issues when rebooting a guest using KVM
> > 1. When the guest initiates a reboot the host is unable to stop the vcpu
> > 2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
> >
> > This can be fixed by clearing the CSR values at reset and syncing the
> > MPSTATE with the host.
> >
> > Signed-off-by: liguang.zhang <liguang.zh...@hexintek.com>
> > ---
> > target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++
> > target/riscv/kvm_riscv.h | 1 +
> > 2 files changed, 43 insertions(+)
> >
> > diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> > index 9d8a8982f9..ecc8ab8238 100644
> > --- a/target/riscv/kvm.c
> > +++ b/target/riscv/kvm.c
> > @@ -44,6 +44,8 @@
> > #include "migration/migration.h"
> > #include "sysemu/runstate.h"
> >
> > +static bool cap_has_mp_state;
> > +
> > static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
> > uint64_t idx)
> > {
> > @@ -790,6 +792,24 @@ int kvm_arch_get_registers(CPUState *cs)
> > return ret;
> > }
> >
> > +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state)
> > +{
> > + if (cap_has_mp_state) {
> > + struct kvm_mp_state mp_state = {
> > + .mp_state = state
> > + };
> > +
> > + int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
> > + if (ret) {
> > + fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n",
> > + __func__, ret, strerror(-ret));
> > + return -1;
> > + }
> > + }
> > +
> > + return 0;
> > +}
> > +
> > int kvm_arch_put_registers(CPUState *cs, int level)
> > {
> > int ret = 0;
> > @@ -809,6 +829,18 @@ int kvm_arch_put_registers(CPUState *cs, int level)
> > return ret;
> > }
> >
> > + if (KVM_PUT_RESET_STATE == level) {
> > + RISCVCPU *cpu = RISCV_CPU(cs);
> > + if (cs->cpu_index == 0) {
> > + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE);
> > + } else {
> > + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED);
> > + }
> > + if (ret) {
> > + return ret;
> > + }
> > + }
>
> You are adding code to kvm_arch_put_registers() don't you also need to
> add code to kvm_arch_get_registers()? and a *_mpstate_to_qemu()
> function to match?
>
> Alistair
I think don't need to add code to kvm_arch_get_registers, because i just add reset behavior
to kvm_arch_put_registers, system reset will come to this point; this is just an suitable entry.
There is no code using when vcpu reset, qemu don't need to get register from vcpu.
According the reset logic of riscv, vcpu is just in pause state in kvm but not destroyed.
Just when qemu reset all system point, call in this entry, and sync vcpu power state and register state to kvm is ok.
And it don't need to modify kvm code to adapt with this change.
2 scenarios of reboot:
1. When a reboot executed from the guest's internal shell enters KVM through SBI, it sets all vcpu->arch.power_off to 'on,' effectively powering off all vCPUs
2. When QEMU issues 'system_reset,' it does not handle kvm's vcpu->arch.power_off; instead, it simply causes all vCPU threads to exit the KVM_RUN loop, effectively ending the ioctl(KVM_RUN) call. This behavior is similar to the guest shell reboot. This also explains why in non-SMP scenarios, 'system_reset' can perform a normal restart. Because the vCPU responsible for booting (boot_hart) remains powered on, it can be scheduled properly.so just to actively send a vCPU power-off command to KVM for vCPUs other than boot_hart, causing the vcpu->arch.power_off state of non-boot_hart vCPUs to return to 'on'
and boot_hart vcpu in kernel call up other vcpu by opensbi hsm_hart_start ecall to kvm hypervisor change the power_off state to off.
```log
$ reboot
The system is going down NOW!
Sent SIGTERM to all processes
Sent SIGKILL to all processes
Requesting system reboot
[ 90.660001] reboot: Restarting system
--------- all smp vcpu means paused not destroyed ------------------
vcpu csrs registers all in a intermediate state, and vcpu in power_off state
[just a kvm vcpu flag vcpu->arch.power_off=true]
---------------- qemu need at system reset point end stage call vcpu up and reset its registers csrs-------------
as this flow https://gitee.com/zhangliguang1/tuchuang/raw/master/img/20230913161603.png
qemu_system_reset
qemu_devices_reset
cpu_synchronize_all_post_reset
do_kvm_cpu_synchronize_post_reset
kvm_arch_put_registers(cpu, KVM_PUT_RESET_STATE)
```
Thanks~
from liguang.zhang@hexintek.com
>
> > +
> > return ret;
> > }
> >
> > @@ -909,6 +941,7 @@ int kvm_arch_add_msi_route_post(struct
> > kvm_irq_routing_entry *route,
> >
> > int kvm_arch_init(MachineState *ms, KVMState *s)
> > {
> > + cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
> > return 0;
> > }
> >
> > @@ -987,10 +1020,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
> > if (!kvm_enabled()) {
> > return;
> > }
> > + for (int i=0; i<32; i++)
> > + env->gpr[i] = 0;
> > env->pc = cpu->env.kernel_addr;
> > env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
> > env->gpr[11] = cpu->env.fdt_addr; /* a1 */
> > env->satp = 0;
> > + env->mie = 0;
> > + env->stvec = 0;
> > + env->sscratch = 0;
> > + env->sepc = 0;
> > + env->scause = 0;
> > + env->stval = 0;
> > + env->mip = 0;
> > }
> >
> > void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
> > diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
> > index e3ba935808..3ea68c38e3 100644
> > --- a/target/riscv/kvm_riscv.h
> > +++ b/target/riscv/kvm_riscv.h
> > @@ -22,5 +22,6 @@
> > void kvm_riscv_init_user_properties(Object *cpu_obj);
> > void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
> > void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level);
> > +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
> >
> > #endif
> > --
> > 2.41.0
> >
From: "liguang.zhang" <liguang.zhang@hexintek.com>
Fix the guest reboot error when using KVM
There are two issues when rebooting a guest using KVM
1. When the guest initiates a reboot the host is unable to stop the vcpu
2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
This can be fixed by clearing the CSR values at reset and syncing the
MPSTATE with the host.
v4 update:
rebase on riscv-to-apply
Signed-off-by: liguang.zhang <liguang.zhang@hexintek.com>
---
target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++
target/riscv/kvm_riscv.h | 1 +
2 files changed, 43 insertions(+)
diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
index c01cfb03f4..8ee410b9b1 100644
--- a/target/riscv/kvm.c
+++ b/target/riscv/kvm.c
@@ -51,6 +51,8 @@ void riscv_kvm_aplic_request(void *opaque, int irq, int level)
kvm_set_irq(kvm_state, irq, !!level);
}
+static bool cap_has_mp_state;
+
static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
uint64_t idx)
{
@@ -797,6 +799,24 @@ int kvm_arch_get_registers(CPUState *cs)
return ret;
}
+int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state)
+{
+ if (cap_has_mp_state) {
+ struct kvm_mp_state mp_state = {
+ .mp_state = state
+ };
+
+ int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
+ if (ret) {
+ fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n",
+ __func__, ret, strerror(-ret));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
int kvm_arch_put_registers(CPUState *cs, int level)
{
int ret = 0;
@@ -816,6 +836,18 @@ int kvm_arch_put_registers(CPUState *cs, int level)
return ret;
}
+ if (KVM_PUT_RESET_STATE == level) {
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ if (cs->cpu_index == 0) {
+ ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE);
+ } else {
+ ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED);
+ }
+ if (ret) {
+ return ret;
+ }
+ }
+
return ret;
}
@@ -928,6 +960,7 @@ int kvm_arch_get_default_type(MachineState *ms)
int kvm_arch_init(MachineState *ms, KVMState *s)
{
+ cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
return 0;
}
@@ -1014,10 +1047,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
if (!kvm_enabled()) {
return;
}
+ for (int i=0; i<32; i++)
+ env->gpr[i] = 0;
env->pc = cpu->env.kernel_addr;
env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
env->gpr[11] = cpu->env.fdt_addr; /* a1 */
env->satp = 0;
+ env->mie = 0;
+ env->stvec = 0;
+ env->sscratch = 0;
+ env->sepc = 0;
+ env->scause = 0;
+ env->stval = 0;
+ env->mip = 0;
}
void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
index de8c209ebc..8f8c1f969a 100644
--- a/target/riscv/kvm_riscv.h
+++ b/target/riscv/kvm_riscv.h
@@ -27,5 +27,6 @@ void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift,
uint64_t aplic_base, uint64_t imsic_base,
uint64_t guest_num);
void riscv_kvm_aplic_request(void *opaque, int irq, int level);
+int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
#endif
--
2.41.0On Wed, Sep 13, 2023 at 7:14 PM liguang.zhang <18622748025@163.com> wrote:
>
> From: "liguang.zhang" <liguang.zhang@hexintek.com>
>
> Fix the guest reboot error when using KVM
> There are two issues when rebooting a guest using KVM
> 1. When the guest initiates a reboot the host is unable to stop the vcpu
> 2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
>
> This can be fixed by clearing the CSR values at reset and syncing the
> MPSTATE with the host.
>
> v4 update:
> rebase on riscv-to-apply
>
> Signed-off-by: liguang.zhang <liguang.zhang@hexintek.com>
I have fixed up some of the issues and applied this
Thanks!
Applied to riscv-to-apply.next
Alistair
> ---
> target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++
> target/riscv/kvm_riscv.h | 1 +
> 2 files changed, 43 insertions(+)
>
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index c01cfb03f4..8ee410b9b1 100644
> --- a/target/riscv/kvm.c
> +++ b/target/riscv/kvm.c
> @@ -51,6 +51,8 @@ void riscv_kvm_aplic_request(void *opaque, int irq, int level)
> kvm_set_irq(kvm_state, irq, !!level);
> }
>
> +static bool cap_has_mp_state;
> +
> static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
> uint64_t idx)
> {
> @@ -797,6 +799,24 @@ int kvm_arch_get_registers(CPUState *cs)
> return ret;
> }
>
> +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state)
> +{
> + if (cap_has_mp_state) {
> + struct kvm_mp_state mp_state = {
> + .mp_state = state
> + };
> +
> + int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
> + if (ret) {
> + fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n",
> + __func__, ret, strerror(-ret));
> + return -1;
> + }
> + }
> +
> + return 0;
> +}
> +
> int kvm_arch_put_registers(CPUState *cs, int level)
> {
> int ret = 0;
> @@ -816,6 +836,18 @@ int kvm_arch_put_registers(CPUState *cs, int level)
> return ret;
> }
>
> + if (KVM_PUT_RESET_STATE == level) {
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + if (cs->cpu_index == 0) {
> + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE);
> + } else {
> + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED);
> + }
> + if (ret) {
> + return ret;
> + }
> + }
> +
> return ret;
> }
>
> @@ -928,6 +960,7 @@ int kvm_arch_get_default_type(MachineState *ms)
>
> int kvm_arch_init(MachineState *ms, KVMState *s)
> {
> + cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
> return 0;
> }
>
> @@ -1014,10 +1047,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
> if (!kvm_enabled()) {
> return;
> }
> + for (int i=0; i<32; i++)
> + env->gpr[i] = 0;
> env->pc = cpu->env.kernel_addr;
> env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
> env->gpr[11] = cpu->env.fdt_addr; /* a1 */
> env->satp = 0;
> + env->mie = 0;
> + env->stvec = 0;
> + env->sscratch = 0;
> + env->sepc = 0;
> + env->scause = 0;
> + env->stval = 0;
> + env->mip = 0;
> }
>
> void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
> diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
> index de8c209ebc..8f8c1f969a 100644
> --- a/target/riscv/kvm_riscv.h
> +++ b/target/riscv/kvm_riscv.h
> @@ -27,5 +27,6 @@ void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift,
> uint64_t aplic_base, uint64_t imsic_base,
> uint64_t guest_num);
> void riscv_kvm_aplic_request(void *opaque, int irq, int level);
> +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
>
> #endif
> --
> 2.41.0
>
On Wed, Sep 13, 2023 at 7:14 PM liguang.zhang <18622748025@163.com> wrote:
>
> From: "liguang.zhang" <liguang.zhang@hexintek.com>
>
> Fix the guest reboot error when using KVM
> There are two issues when rebooting a guest using KVM
> 1. When the guest initiates a reboot the host is unable to stop the vcpu
> 2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
>
> This can be fixed by clearing the CSR values at reset and syncing the
> MPSTATE with the host.
>
> v4 update:
> rebase on riscv-to-apply
>
> Signed-off-by: liguang.zhang <liguang.zhang@hexintek.com>
This patch fails checkpatch. You should run checkpatch on all patches
before submitting them
git show | ./scripts/checkpatch.pl -
Alistair
> ---
> target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++
> target/riscv/kvm_riscv.h | 1 +
> 2 files changed, 43 insertions(+)
>
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index c01cfb03f4..8ee410b9b1 100644
> --- a/target/riscv/kvm.c
> +++ b/target/riscv/kvm.c
> @@ -51,6 +51,8 @@ void riscv_kvm_aplic_request(void *opaque, int irq, int level)
> kvm_set_irq(kvm_state, irq, !!level);
> }
>
> +static bool cap_has_mp_state;
> +
> static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
> uint64_t idx)
> {
> @@ -797,6 +799,24 @@ int kvm_arch_get_registers(CPUState *cs)
> return ret;
> }
>
> +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state)
> +{
> + if (cap_has_mp_state) {
> + struct kvm_mp_state mp_state = {
> + .mp_state = state
> + };
> +
> + int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
> + if (ret) {
> + fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n",
> + __func__, ret, strerror(-ret));
> + return -1;
> + }
> + }
> +
> + return 0;
> +}
> +
> int kvm_arch_put_registers(CPUState *cs, int level)
> {
> int ret = 0;
> @@ -816,6 +836,18 @@ int kvm_arch_put_registers(CPUState *cs, int level)
> return ret;
> }
>
> + if (KVM_PUT_RESET_STATE == level) {
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + if (cs->cpu_index == 0) {
> + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE);
> + } else {
> + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED);
> + }
> + if (ret) {
> + return ret;
> + }
> + }
> +
> return ret;
> }
>
> @@ -928,6 +960,7 @@ int kvm_arch_get_default_type(MachineState *ms)
>
> int kvm_arch_init(MachineState *ms, KVMState *s)
> {
> + cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
> return 0;
> }
>
> @@ -1014,10 +1047,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
> if (!kvm_enabled()) {
> return;
> }
> + for (int i=0; i<32; i++)
> + env->gpr[i] = 0;
> env->pc = cpu->env.kernel_addr;
> env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
> env->gpr[11] = cpu->env.fdt_addr; /* a1 */
> env->satp = 0;
> + env->mie = 0;
> + env->stvec = 0;
> + env->sscratch = 0;
> + env->sepc = 0;
> + env->scause = 0;
> + env->stval = 0;
> + env->mip = 0;
> }
>
> void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
> diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
> index de8c209ebc..8f8c1f969a 100644
> --- a/target/riscv/kvm_riscv.h
> +++ b/target/riscv/kvm_riscv.h
> @@ -27,5 +27,6 @@ void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift,
> uint64_t aplic_base, uint64_t imsic_base,
> uint64_t guest_num);
> void riscv_kvm_aplic_request(void *opaque, int irq, int level);
> +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
>
> #endif
> --
> 2.41.0
>
On Wed, Sep 13, 2023 at 7:14 PM liguang.zhang <18622748025@163.com> wrote:
>
> From: "liguang.zhang" <liguang.zhang@hexintek.com>
>
> Fix the guest reboot error when using KVM
> There are two issues when rebooting a guest using KVM
> 1. When the guest initiates a reboot the host is unable to stop the vcpu
> 2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
>
> This can be fixed by clearing the CSR values at reset and syncing the
> MPSTATE with the host.
>
> v4 update:
> rebase on riscv-to-apply
This should be below the line
>
> Signed-off-by: liguang.zhang <liguang.zhang@hexintek.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Alistair
> ---
> target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++
> target/riscv/kvm_riscv.h | 1 +
> 2 files changed, 43 insertions(+)
>
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index c01cfb03f4..8ee410b9b1 100644
> --- a/target/riscv/kvm.c
> +++ b/target/riscv/kvm.c
> @@ -51,6 +51,8 @@ void riscv_kvm_aplic_request(void *opaque, int irq, int level)
> kvm_set_irq(kvm_state, irq, !!level);
> }
>
> +static bool cap_has_mp_state;
> +
> static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
> uint64_t idx)
> {
> @@ -797,6 +799,24 @@ int kvm_arch_get_registers(CPUState *cs)
> return ret;
> }
>
> +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state)
> +{
> + if (cap_has_mp_state) {
> + struct kvm_mp_state mp_state = {
> + .mp_state = state
> + };
> +
> + int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
> + if (ret) {
> + fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n",
> + __func__, ret, strerror(-ret));
> + return -1;
> + }
> + }
> +
> + return 0;
> +}
> +
> int kvm_arch_put_registers(CPUState *cs, int level)
> {
> int ret = 0;
> @@ -816,6 +836,18 @@ int kvm_arch_put_registers(CPUState *cs, int level)
> return ret;
> }
>
> + if (KVM_PUT_RESET_STATE == level) {
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + if (cs->cpu_index == 0) {
> + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE);
> + } else {
> + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED);
> + }
> + if (ret) {
> + return ret;
> + }
> + }
> +
> return ret;
> }
>
> @@ -928,6 +960,7 @@ int kvm_arch_get_default_type(MachineState *ms)
>
> int kvm_arch_init(MachineState *ms, KVMState *s)
> {
> + cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
> return 0;
> }
>
> @@ -1014,10 +1047,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
> if (!kvm_enabled()) {
> return;
> }
> + for (int i=0; i<32; i++)
> + env->gpr[i] = 0;
> env->pc = cpu->env.kernel_addr;
> env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
> env->gpr[11] = cpu->env.fdt_addr; /* a1 */
> env->satp = 0;
> + env->mie = 0;
> + env->stvec = 0;
> + env->sscratch = 0;
> + env->sepc = 0;
> + env->scause = 0;
> + env->stval = 0;
> + env->mip = 0;
> }
>
> void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
> diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
> index de8c209ebc..8f8c1f969a 100644
> --- a/target/riscv/kvm_riscv.h
> +++ b/target/riscv/kvm_riscv.h
> @@ -27,5 +27,6 @@ void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift,
> uint64_t aplic_base, uint64_t imsic_base,
> uint64_t guest_num);
> void riscv_kvm_aplic_request(void *opaque, int irq, int level);
> +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
>
> #endif
> --
> 2.41.0
>
From: "liguang.zhang" <liguang.zhang@hexintek.com>
There are two issues when rebooting a guest using KVM
1. When the guest initiates a reboot the host is unable to stop the vcpu
2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
This can be fixed by clearing the CSR values at reset and syncing the
MPSTATE with the host.
kernel log
```shell
$reboot
The system is going down NOW!
Sent SIGTERM to all processes
logout
Sent SIGKILL to all processes
Requesting system reboot
```
then no response
for qemu command:
$system_reset:
kernel log:
```shell
[ 53.739556] kvm [150]: VCPU exit error -95
[ 53.739563] kvm [148]: VCPU exit error -95
[ 53.739557] kvm [149]: VCPU exit error -95
[ 53.740957] kvm [149]: SEPC=0x0 SSTATUS=0x200004120 HSTATUS=0x2002001c0
[ 53.740957] kvm [148]: SEPC=0x0 SSTATUS=0x200004120 HSTATUS=0x2002001c0
[ 53.741054] kvm [148]: SCAUSE=0x14 STVAL=0x0 HTVAL=0x0 HTINST=0x0
[ 53.741058] kvm [149]: SCAUSE=0x14 STVAL=0x0 HTVAL=0x0 HTINST=0x0
[ 53.756187] kvm [150]: SEPC=0x0 SSTATUS=0x200004120 HSTATUS=0x2002001c0
[ 53.757797] kvm [150]: SCAUSE=0x14 STVAL=0x0 HTVAL=0x0 HTINST=0x0
```
solution:
add reset csr and context for riscv vcpu
qemu ioctl reset vcpu->arch.power_off state of kvm
tests:
qemu-system-riscv64 -M virt -bios none -kernel Image \
-smp 4 -enable-kvm \
-append "rootwait root=/dev/vda ro" \
-drive file=rootfs.ext2,format=raw,id=hd0 \
-device virtio-blk-device,drive=hd0
in guest shell:
$reboot
qemu command:
$system_reset
---
v2:
- add reproduction steps
Signed-off-by: liguang.zhang <liguang.zhang@hexintek.com>
---
target/riscv/kvm.c | 44 +++++++++++++++++++++++++++++++++++++++-
target/riscv/kvm_riscv.h | 1 +
2 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
index 0f932a5b96..c478c71905 100644
--- a/target/riscv/kvm.c
+++ b/target/riscv/kvm.c
@@ -42,6 +42,8 @@
#include "migration/migration.h"
#include "sysemu/runstate.h"
+static bool cap_has_mp_state;
+
static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
uint64_t idx)
{
@@ -99,7 +101,7 @@ static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
#define KVM_RISCV_SET_TIMER(cs, env, name, reg) \
do { \
- int ret = kvm_set_one_reg(cs, RISCV_TIMER_REG(env, time), ®); \
+ int ret = kvm_set_one_reg(cs, RISCV_TIMER_REG(env, name), ®); \
if (ret) { \
abort(); \
} \
@@ -335,6 +337,24 @@ int kvm_arch_get_registers(CPUState *cs)
return ret;
}
+int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state)
+{
+ if (cap_has_mp_state) {
+ struct kvm_mp_state mp_state = {
+ .mp_state = state
+ };
+
+ int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
+ if (ret) {
+ fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n",
+ __func__, ret, strerror(-ret));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
int kvm_arch_put_registers(CPUState *cs, int level)
{
int ret = 0;
@@ -354,6 +374,18 @@ int kvm_arch_put_registers(CPUState *cs, int level)
return ret;
}
+ if (KVM_PUT_RESET_STATE == level) {
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ if (cs->cpu_index == 0) {
+ ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE);
+ } else {
+ ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED);
+ }
+ if (ret) {
+ return ret;
+ }
+ }
+
return ret;
}
@@ -428,6 +460,7 @@ int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
int kvm_arch_init(MachineState *ms, KVMState *s)
{
+ cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
return 0;
}
@@ -506,10 +539,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
if (!kvm_enabled()) {
return;
}
+ for (int i=0; i<32; i++)
+ env->gpr[i] = 0;
env->pc = cpu->env.kernel_addr;
env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
env->gpr[11] = cpu->env.fdt_addr; /* a1 */
env->satp = 0;
+ env->mie = 0;
+ env->stvec = 0;
+ env->sscratch = 0;
+ env->sepc = 0;
+ env->scause = 0;
+ env->stval = 0;
+ env->mip = 0;
}
void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
index ed281bdce0..88aee902dd 100644
--- a/target/riscv/kvm_riscv.h
+++ b/target/riscv/kvm_riscv.h
@@ -21,5 +21,6 @@
void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level);
+int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
#endif
--
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