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Date: Fri, 22 Mar 2019 05:20:18 +0000 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>, "Radim Krčmář" <rkrcmar@...hat.com>, "Christoffer Dall" <christoffer.dall@...aro.org>, "Paolo Bonzini" <pbonzini@...hat.com> Subject: [PATCH 3.16 11/16] KVM: PPC: Move xics_debugfs_init out of create 3.16.64-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Christoffer Dall <christoffer.dall@...aro.org> commit 023e9fddc3616b005c3753fc1bb6526388cd7a30 upstream. As we are about to hold the kvm->lock during the create operation on KVM devices, we should move the call to xics_debugfs_init into its own function, since holding a mutex over extended amounts of time might not be a good idea. Introduce an init operation on the kvm_device_ops struct which cannot fail and call this, if configured, after the device has been created. Signed-off-by: Christoffer Dall <christoffer.dall@...aro.org> Reviewed-by: Paolo Bonzini <pbonzini@...hat.com> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- arch/powerpc/kvm/book3s_xics.c | 10 ++++++++-- include/linux/kvm_host.h | 6 ++++++ virt/kvm/kvm_main.c | 3 +++ 3 files changed, 17 insertions(+), 2 deletions(-) --- a/arch/powerpc/kvm/book3s_xics.c +++ b/arch/powerpc/kvm/book3s_xics.c @@ -1251,8 +1251,6 @@ static int kvmppc_xics_create(struct kvm return ret; } - xics_debugfs_init(xics); - #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE if (cpu_has_feature(CPU_FTR_ARCH_206)) { /* Enable real mode support */ @@ -1264,9 +1262,17 @@ static int kvmppc_xics_create(struct kvm return 0; } +static void kvmppc_xics_init(struct kvm_device *dev) +{ + struct kvmppc_xics *xics = (struct kvmppc_xics *)dev->private; + + xics_debugfs_init(xics); +} + struct kvm_device_ops kvm_xics_ops = { .name = "kvm-xics", .create = kvmppc_xics_create, + .init = kvmppc_xics_init, .destroy = kvmppc_xics_free, .set_attr = xics_set_attr, .get_attr = xics_get_attr, --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1062,6 +1062,12 @@ struct kvm_device_ops { int (*create)(struct kvm_device *dev, u32 type); /* + * init is called after create if create is successful and is called + * outside of holding kvm->lock. + */ + void (*init)(struct kvm_device *dev); + + /* * Destroy is responsible for freeing dev. * * Destroy may be called before or after destructors are called --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2328,6 +2328,9 @@ static int kvm_ioctl_create_device(struc return ret; } + if (ops->init) + ops->init(dev); + ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); if (ret < 0) { ops->destroy(dev);
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