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-rw-r--r--arch/mips/kvm/mips.c5
-rw-r--r--arch/powerpc/kvm/powerpc.c5
-rw-r--r--arch/s390/kvm/kvm-s390.c12
-rw-r--r--arch/x86/kvm/x86.c14
-rw-r--r--include/linux/kvm_host.h1
-rw-r--r--virt/kvm/arm/arm.c21
-rw-r--r--virt/kvm/kvm_main.c4
7 files changed, 43 insertions, 19 deletions
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index d72bceb10439..2e14455aec4e 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -280,6 +280,11 @@ static inline void dump_handler(const char *symbol, void *start, void *end)
pr_debug("\tEND(%s)\n", symbol);
}
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+ return 0;
+}
+
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
{
int err, size;
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index a2ba708f5cec..998ef60ac463 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -720,6 +720,11 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
kvmppc_core_flush_memslot(kvm, slot);
}
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+ return 0;
+}
+
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
{
struct kvm_vcpu *vcpu;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index d9e6bf3d54f0..57c6838dff37 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -3035,15 +3035,19 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
return rc;
}
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+ if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
+ return -EINVAL;
+ return 0;
+}
+
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
unsigned int id)
{
struct kvm_vcpu *vcpu;
struct sie_page *sie_page;
- int rc = -EINVAL;
-
- if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
- goto out;
+ int rc;
rc = -ENOMEM;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8188d6cac588..661e3c40529f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9170,17 +9170,21 @@ static void fx_init(struct kvm_vcpu *vcpu)
vcpu->arch.cr0 |= X86_CR0_ET;
}
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+ if (kvm_check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
+ pr_warn_once("kvm: SMP vm created on host with unstable TSC; "
+ "guest TSC will not be reliable\n");
+
+ return 0;
+}
+
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
unsigned int id)
{
struct kvm_vcpu *vcpu;
int r;
- if (kvm_check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
- printk_once(KERN_WARNING
- "kvm: SMP vm created on host with unstable TSC; "
- "guest TSC will not be reliable\n");
-
vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL_ACCOUNT);
if (!vcpu)
return ERR_PTR(-ENOMEM);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 4f7c8e2f378d..59ac53423361 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -874,6 +874,7 @@ void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id);
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index adae134cec59..af3ce2bb370d 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -279,21 +279,22 @@ void kvm_arch_free_vm(struct kvm *kvm)
vfree(kvm);
}
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+ if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
+ return -EBUSY;
+
+ if (id >= kvm->arch.max_vcpus)
+ return -EINVAL;
+
+ return 0;
+}
+
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
{
int err;
struct kvm_vcpu *vcpu;
- if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
- err = -EBUSY;
- goto out;
- }
-
- if (id >= kvm->arch.max_vcpus) {
- err = -EINVAL;
- goto out;
- }
-
vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
if (!vcpu) {
err = -ENOMEM;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 483c683408a2..7b52207f829c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2728,6 +2728,10 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
kvm->created_vcpus++;
mutex_unlock(&kvm->lock);
+ r = kvm_arch_vcpu_precreate(kvm, id);
+ if (r)
+ goto vcpu_decrement;
+
vcpu = kvm_arch_vcpu_create(kvm, id);
if (IS_ERR(vcpu)) {
r = PTR_ERR(vcpu);