[PATCH v3 09/16] KVM: Move vcpu_load to arch-specific kvm_arch_vcpu_ioctl_set_mpstate

[Christoffer Dall <cdall@kernel.org>]

From: Christoffer Dall <christoffer.dall@linaro.org>

Move vcpu_load() and vcpu_put() into the architecture specific
implementations of kvm_arch_vcpu_ioctl_set_mpstate().

Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
 arch/s390/kvm/kvm-s390.c |  3 +++
 arch/x86/kvm/x86.c       | 14 +++++++++++---
 virt/kvm/arm/arm.c       |  9 +++++++--
 virt/kvm/kvm_main.c      |  2 --
 4 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 396fc3db6d63..8fade858c790 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2853,6 +2853,8 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 {
        int rc = 0;
 
+       vcpu_load(vcpu);
+
        /* user space knows about this interface - let it control the state */
        vcpu->kvm->arch.user_cpu_state_ctrl = 1;
 
@@ -2870,6 +2872,7 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
                rc = -ENXIO;
        }
 
+       vcpu_put(vcpu);
        return rc;
 }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9bf62c336aa5..8e67428af01b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7456,15 +7456,19 @@ int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu 
*vcpu,
 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
                                    struct kvm_mp_state *mp_state)
 {
+       int ret = -EINVAL;
+
+       vcpu_load(vcpu);
+
        if (!lapic_in_kernel(vcpu) &&
            mp_state->mp_state != KVM_MP_STATE_RUNNABLE)
-               return -EINVAL;
+               goto out;
 
        /* INITs are latched while in SMM */
        if ((is_smm(vcpu) || vcpu->arch.smi_pending) &&
            (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED ||
             mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED))
-               return -EINVAL;
+               goto out;
 
        if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) {
                vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
@@ -7472,7 +7476,11 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu 
*vcpu,
        } else
                vcpu->arch.mp_state = mp_state->mp_state;
        kvm_make_request(KVM_REQ_EVENT, vcpu);
-       return 0;
+
+       ret = 0;
+out:
+       vcpu_put(vcpu);
+       return ret;
 }
 
 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index a7171701df44..9a3acbcf542c 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -395,6 +395,10 @@ int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
                                    struct kvm_mp_state *mp_state)
 {
+       int ret = 0;
+
+       vcpu_load(vcpu);
+
        switch (mp_state->mp_state) {
        case KVM_MP_STATE_RUNNABLE:
                vcpu->arch.power_off = false;
@@ -403,10 +407,11 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
                vcpu_power_off(vcpu);
                break;
        default:
-               return -EINVAL;
+               ret = -EINVAL;
        }
 
-       return 0;
+       vcpu_put(vcpu);
+       return ret;
 }
 
 /**
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index eac3c29697db..f3600052adbb 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2618,9 +2618,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
                r = -EFAULT;
                if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
                        goto out;
-               vcpu_load(vcpu);
                r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
-               vcpu_put(vcpu);
                break;
        }
        case KVM_TRANSLATE: {
-- 
2.14.2