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| author | Sergey Senozhatsky <senozhatsky@chromium.org> | 2021-06-06 04:10:44 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-06-17 19:09:32 +0200 |
| commit | 2fdef3a2ae01dfd928c4b42c5a3b76546170a74c (patch) | |
| tree | b3bdb69df0c7f0dcf977c68afecda591ef0631bc /virt | |
| parent | KVM: selftests: Introduce x2APIC register manipulation functions (diff) | |
| download | linux-2fdef3a2ae01dfd928c4b42c5a3b76546170a74c.tar.xz linux-2fdef3a2ae01dfd928c4b42c5a3b76546170a74c.zip | |
kvm: add PM-notifier
Add KVM PM-notifier so that architectures can have arch-specific
VM suspend/resume routines. Such architectures need to select
CONFIG_HAVE_KVM_PM_NOTIFIER and implement kvm_arch_pm_notifier().
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Message-Id: <20210606021045.14159-1-senozhatsky@chromium.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/Kconfig | 3 | ||||
| -rw-r--r-- | virt/kvm/kvm_main.c | 35 |
2 files changed, 38 insertions, 0 deletions
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig index 1c37ccd5d402..62b39149b8c8 100644 --- a/virt/kvm/Kconfig +++ b/virt/kvm/Kconfig @@ -63,3 +63,6 @@ config HAVE_KVM_NO_POLL config KVM_XFER_TO_GUEST_WORK bool + +config HAVE_KVM_PM_NOTIFIER + bool diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index fa7e7ebefc79..fc35ba0ea5d3 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> @@ -780,6 +781,38 @@ static int kvm_init_mmu_notifier(struct kvm *kvm) #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ +#ifdef CONFIG_HAVE_KVM_PM_NOTIFIER +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); + + return kvm_arch_pm_notifier(kvm, state); +} + +static void kvm_init_pm_notifier(struct kvm *kvm) +{ + kvm->pm_notifier.notifier_call = kvm_pm_notifier_call; + /* Suspend KVM before we suspend ftrace, RCU, etc. */ + 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 /* !CONFIG_HAVE_KVM_PM_NOTIFIER */ +static void kvm_init_pm_notifier(struct kvm *kvm) +{ +} + +static void kvm_destroy_pm_notifier(struct kvm *kvm) +{ +} +#endif /* CONFIG_HAVE_KVM_PM_NOTIFIER */ + static struct kvm_memslots *kvm_alloc_memslots(void) { int i; @@ -964,6 +997,7 @@ static struct kvm *kvm_create_vm(unsigned long type) mutex_unlock(&kvm_lock); preempt_notifier_inc(); + kvm_init_pm_notifier(kvm); return kvm; @@ -1011,6 +1045,7 @@ 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); |