Hi,
[replying to myself]
On Sat, Nov 25, 2017 at 09:57:17PM +0100, Christoffer Dall wrote:
> Move the calls to vcpu_load() and vcpu_put() in to the architecture
> specific implementations of kvm_arch_vcpu_ioctl() which dispatches
> further architecture-specific ioctls on to other functions.
>
> Some architectures support asynchronous vcpu ioctls which cannot call
> vcpu_load() or take the vcpu->mutex, because that would prevent
> concurrent execution with a running VCPU, which is the intended purpose
> of these ioctls, for example because they inject interrupts.
>
> We move the checks for these specifics into the architecture code for
> MIPS, S390 and PPC, and it has the added benefit of getting rid of the
> ifdef in the generic dispatcher.
>
> Signed-off-by: Christoffer Dall <christoffer.d...@linaro.org>
> ---
> arch/mips/kvm/mips.c | 51 +++++++++++++++++++++++----------------
> arch/powerpc/kvm/powerpc.c | 15 +++++++-----
> arch/s390/kvm/kvm-s390.c | 21 +++++++++-------
> arch/x86/kvm/x86.c | 24 ++++++++++++++-----
> virt/kvm/arm/arm.c | 60
> ++++++++++++++++++++++++++++++++--------------
> virt/kvm/kvm_main.c | 15 +-----------
> 6 files changed, 114 insertions(+), 72 deletions(-)
>
[...]
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 66e5c2445a87..027a6259c3c4 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -1621,16 +1621,18 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
> void __user *argp = (void __user *)arg;
> long r;
>
> - switch (ioctl) {
> - case KVM_INTERRUPT: {
> + if (ioctl == KVM_INTERRUPT) {
> struct kvm_interrupt irq;
> - r = -EFAULT;
> if (copy_from_user(&irq, argp, sizeof(irq)))
> - goto out;
> - r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
> - goto out;
> + return -EFAULT;
> + return kvm_vcpu_ioctl_interrupt(vcpu, &irq);
> }
>
> + r = vcpu_load(vcpu);
> + if (r)
> + return r;
> +
> + switch (ioctl) {
> case KVM_ENABLE_CAP:
> {
> struct kvm_enable_cap cap;
> @@ -1670,6 +1672,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
> }
>
> out:
> + vcpu_put(r);
> return r;
This should obviously be
vcpu_put(vcpu);
Fixed for v2.
Thanks,
-Christoffer
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