KVM: introduce kvm_arch_vcpu_async_ioctl
After the vcpu_load/vcpu_put pushdown, the handling of asynchronous VCPU
ioctl is already much clearer in that it is obvious that they bypass
vcpu_load and vcpu_put.
However, it is still not perfect in that the different state of the VCPU
mutex is still hidden in the caller. Separate those ioctls into a new
function kvm_arch_vcpu_async_ioctl that returns -ENOIOCTLCMD for more
"traditional" synchronous ioctls.
Cc: James Hogan <jhogan@kernel.org>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Suggested-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/mips/kvm/Kconfig b/arch/mips/kvm/Kconfig
index b17447c..76b93a9 100644
--- a/arch/mips/kvm/Kconfig
+++ b/arch/mips/kvm/Kconfig
@@ -22,6 +22,7 @@
select PREEMPT_NOTIFIERS
select ANON_INODES
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
+ select HAVE_KVM_VCPU_ASYNC_IOCTL
select KVM_MMIO
select MMU_NOTIFIER
select SRCU
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 9200b3d..2549fdd 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -903,12 +903,11 @@
return r;
}
-long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
- unsigned long arg)
+long kvm_arch_vcpu_async_ioctl(struct file *filp, unsigned int ioctl,
+ unsigned long arg)
{
struct kvm_vcpu *vcpu = filp->private_data;
void __user *argp = (void __user *)arg;
- long r;
if (ioctl == KVM_INTERRUPT) {
struct kvm_mips_interrupt irq;
@@ -921,6 +920,16 @@
return kvm_vcpu_ioctl_interrupt(vcpu, &irq);
}
+ return -ENOIOCTLCMD;
+}
+
+long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
+ unsigned long arg)
+{
+ struct kvm_vcpu *vcpu = filp->private_data;
+ void __user *argp = (void __user *)arg;
+ long r;
+
vcpu_load(vcpu);
switch (ioctl) {
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index b12b8eb..f884a05 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -22,6 +22,7 @@
select PREEMPT_NOTIFIERS
select ANON_INODES
select HAVE_KVM_EVENTFD
+ select HAVE_KVM_VCPU_ASYNC_IOCTL
select SRCU
select KVM_VFIO
select IRQ_BYPASS_MANAGER
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index ba8134a..66a3107 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -1607,12 +1607,11 @@
return -EINVAL;
}
-long kvm_arch_vcpu_ioctl(struct file *filp,
- unsigned int ioctl, unsigned long arg)
+long kvm_arch_vcpu_async_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
{
struct kvm_vcpu *vcpu = filp->private_data;
void __user *argp = (void __user *)arg;
- long r;
if (ioctl == KVM_INTERRUPT) {
struct kvm_interrupt irq;
@@ -1620,6 +1619,15 @@
return -EFAULT;
return kvm_vcpu_ioctl_interrupt(vcpu, &irq);
}
+ return -ENOIOCTLCMD;
+}
+
+long kvm_arch_vcpu_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct kvm_vcpu *vcpu = filp->private_data;
+ void __user *argp = (void __user *)arg;
+ long r;
vcpu_load(vcpu);
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index 9a4594e..a3dbd45 100644
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -23,6 +23,7 @@
select PREEMPT_NOTIFIERS
select ANON_INODES
select HAVE_KVM_CPU_RELAX_INTERCEPT
+ select HAVE_KVM_VCPU_ASYNC_IOCTL
select HAVE_KVM_EVENTFD
select KVM_ASYNC_PF
select KVM_ASYNC_PF_SYNC
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 9700d71..40f0ae5 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -3725,13 +3725,11 @@
return r;
}
-long kvm_arch_vcpu_ioctl(struct file *filp,
- unsigned int ioctl, unsigned long arg)
+long kvm_arch_vcpu_async_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
{
struct kvm_vcpu *vcpu = filp->private_data;
void __user *argp = (void __user *)arg;
- int idx;
- long r;
switch (ioctl) {
case KVM_S390_IRQ: {
@@ -3752,6 +3750,16 @@
return kvm_s390_inject_vcpu(vcpu, &s390irq);
}
}
+ return -ENOIOCTLCMD;
+}
+
+long kvm_arch_vcpu_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct kvm_vcpu *vcpu = filp->private_data;
+ void __user *argp = (void __user *)arg;
+ int idx;
+ long r;
vcpu_load(vcpu);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 09de0ff..ac0062b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1260,4 +1260,16 @@
}
#endif /* CONFIG_HAVE_KVM_INVALID_WAKEUPS */
+#ifdef CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL
+long kvm_arch_vcpu_async_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg);
+#else
+static inline long kvm_arch_vcpu_async_ioctl(struct file *filp,
+ unsigned int ioctl,
+ unsigned long arg)
+{
+ return -ENOIOCTLCMD;
+}
+#endif /* CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL */
+
#endif
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 70691c0..cca7e06 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -51,3 +51,6 @@
config HAVE_KVM_IRQ_BYPASS
bool
+
+config HAVE_KVM_VCPU_ASYNC_IOCTL
+ bool
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 19c184f..b441484 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2544,15 +2544,13 @@
if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
return -EINVAL;
-#if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
/*
- * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
- * so vcpu_load() would break it.
+ * Some architectures have vcpu ioctls that are asynchronous to vcpu
+ * execution; mutex_lock() would break them.
*/
- if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
- return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
-#endif
-
+ r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg);
+ if (r != -ENOIOCTLCMD)
+ return r;
if (mutex_lock_killable(&vcpu->mutex))
return -EINTR;