Sergey Senozhatsky <[email protected]> writes: > Add KVM suspend/hibernate PM-notifier which lets architectures > to implement arch-specific VM suspend code. For instance, on x86 > this sets PVCLOCK_GUEST_STOPPED on all the VCPUs. > > Our case is that user puts the host system into sleep multiple > times a day (e.g. closes the laptop's lid) so we need a reliable > way to suspend VMs properly. > > Signed-off-by: Sergey Senozhatsky <[email protected]> > --- > arch/arm64/kvm/arm.c | 4 ++++ > arch/mips/kvm/mips.c | 4 ++++ > arch/powerpc/kvm/powerpc.c | 4 ++++ > arch/s390/kvm/kvm-s390.c | 4 ++++ > arch/x86/kvm/x86.c | 21 ++++++++++++++++++++ > include/linux/kvm_host.h | 8 ++++++++ > virt/kvm/kvm_main.c | 40 ++++++++++++++++++++++++++++++++++++++ > 7 files changed, 85 insertions(+) > > diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c > index 1126eae27400..547dbe44d039 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -1311,6 +1311,10 @@ static int kvm_vm_ioctl_set_device_addr(struct kvm > *kvm, > } > } > > +void kvm_arch_pm_notifier(struct kvm *kvm) > +{ > +} > + > long kvm_arch_vm_ioctl(struct file *filp, > unsigned int ioctl, unsigned long arg) > { > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c > index 4d4af97dcc88..d4408acd2be6 100644 > --- a/arch/mips/kvm/mips.c > +++ b/arch/mips/kvm/mips.c > @@ -980,6 +980,10 @@ void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm, > kvm_flush_remote_tlbs(kvm); > } > > +void kvm_arch_pm_notifier(struct kvm *kvm) > +{ > +} > + > long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long > arg) > { > long r; > diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c > index a2a68a958fa0..96e8a7b6fcf0 100644 > --- a/arch/powerpc/kvm/powerpc.c > +++ b/arch/powerpc/kvm/powerpc.c > @@ -2334,6 +2334,10 @@ static int kvmppc_get_cpu_char(struct kvm_ppc_cpu_char > *cp) > } > #endif > > +void kvm_arch_pm_notifier(struct kvm *kvm) > +{ > +} > + > long kvm_arch_vm_ioctl(struct file *filp, > unsigned int ioctl, unsigned long arg) > { > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c > index 1296fc10f80c..c5f86fc1e497 100644 > --- a/arch/s390/kvm/kvm-s390.c > +++ b/arch/s390/kvm/kvm-s390.c > @@ -2367,6 +2367,10 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct > kvm_pv_cmd *cmd) > return r; > } > > +void kvm_arch_pm_notifier(struct kvm *kvm) > +{ > +} > + > long kvm_arch_vm_ioctl(struct file *filp, > unsigned int ioctl, unsigned long arg) > { > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index bbc4e04e67ad..3f3d6497593f 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -5613,6 +5613,27 @@ static int kvm_vm_ioctl_set_msr_filter(struct kvm > *kvm, void __user *argp) > return 0; > } > > +void kvm_arch_pm_notifier(struct kvm *kvm) > +{ > +#ifdef CONFIG_PM > + int c; > + > + mutex_lock(&kvm->lock); > + for (c = 0; c < kvm->created_vcpus; c++) { > + struct kvm_vcpu *vcpu = kvm->vcpus[c]; > + int r; > + > + if (!vcpu) > + continue; > + r = kvm_set_guest_paused(vcpu); > + if (!r) > + continue; > + pr_err("Failed to suspend VCPU-%d: %d\n", vcpu->vcpu_id, r); > + } > + mutex_unlock(&kvm->lock); > +#endif > +} > + > long kvm_arch_vm_ioctl(struct file *filp, > unsigned int ioctl, unsigned long arg) > { > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > index 2f34487e21f2..86695320a6b7 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -37,6 +37,8 @@ > #include <asm/kvm_host.h> > #include <linux/kvm_dirty_ring.h> > > +#include <linux/notifier.h> > + > #ifndef KVM_MAX_VCPU_ID > #define KVM_MAX_VCPU_ID KVM_MAX_VCPUS > #endif > @@ -579,6 +581,10 @@ struct kvm { > pid_t userspace_pid; > unsigned int max_halt_poll_ns; > u32 dirty_ring_size; > + > +#ifdef CONFIG_PM > + struct notifier_block pm_notifier; > +#endif > }; > > #define kvm_err(fmt, ...) \ > @@ -992,6 +998,8 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu); > void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu); > void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu); > > +void kvm_arch_pm_notifier(struct kvm *kvm); > + > #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS > void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry > *debugfs_dentry); > #endif > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index 6b4feb92dc79..86925ab7d162 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -51,6 +51,7 @@ > #include <linux/io.h> > #include <linux/lockdep.h> > #include <linux/kthread.h> > +#include <linux/suspend.h> > > #include <asm/processor.h> > #include <asm/ioctl.h> > @@ -779,6 +780,43 @@ static int kvm_init_mmu_notifier(struct kvm *kvm) > > #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ > > +#ifdef CONFIG_PM > +static int kvm_pm_notifier_call(struct notifier_block *bl, > + unsigned long state, > + void *unused) > +{ > + struct kvm *kvm = container_of(bl, struct kvm, pm_notifier); > + > + switch (state) { > + case PM_HIBERNATION_PREPARE: > + case PM_SUSPEND_PREPARE: > + kvm_arch_pm_notifier(kvm); > + break; > + } > + return NOTIFY_DONE; > +} > + > +static void kvm_init_pm_notifier(struct kvm *kvm) > +{ > + kvm->pm_notifier.notifier_call = kvm_pm_notifier_call; > + kvm->pm_notifier.priority = INT_MAX; > + register_pm_notifier(&kvm->pm_notifier); > +} > + > +static void kvm_destroy_pm_notifier(struct kvm *kvm) > +{ > + unregister_pm_notifier(&kvm->pm_notifier); > +} > +#else > +static void kvm_init_pm_notifier(struct kvm *kvm) > +{ > +} > + > +static void kvm_destroy_pm_notifier(struct kvm *kvm) > +{ > +} > +#endif /* CONFIG_PM */ > + > static struct kvm_memslots *kvm_alloc_memslots(void) > { > int i; > @@ -962,6 +1000,7 @@ static struct kvm *kvm_create_vm(unsigned long type) > mutex_unlock(&kvm_lock); > > preempt_notifier_inc(); > + kvm_init_pm_notifier(kvm); >
You've probably thought it through and I didn't but wouldn't it be easier to have one global pm_notifier call for KVM which would go through the list of VMs instead of registering/deregistering a pm_notifier call for every created/destroyed VM? > return kvm; > > @@ -1009,6 +1048,7 @@ static void kvm_destroy_vm(struct kvm *kvm) > int i; > struct mm_struct *mm = kvm->mm; > > + kvm_destroy_pm_notifier(kvm); > kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm); > kvm_destroy_vm_debugfs(kvm); > kvm_arch_sync_events(kvm); -- Vitaly _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
