From da908f2fb4e783c2a4de751fb90f11a0dd041161 Mon Sep 17 00:00:00 2001 From: Zachary Amsden Date: Thu, 19 Aug 2010 22:07:27 -1000 Subject: KVM: x86: Perform hardware_enable in CPU_STARTING callback The CPU_STARTING callback was added upstream with the intention of being used for KVM, specifically for the hardware enablement that must be done before we can run in hardware virt. It had bugs on the x86_64 architecture at the time, where it was called after CPU_ONLINE. The arches have since merged and the bug is gone. It might be noted other features should probably start making use of this callback; microcode updates in particular which might be fixing important erratums would be best applied before beginning to run user tasks. Signed-off-by: Zachary Amsden Signed-off-by: Marcelo Tosatti --- virt/kvm/kvm_main.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'virt') diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index b78b794c103..d4853a54771 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1958,10 +1958,10 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, cpu); hardware_disable(NULL); break; - case CPU_ONLINE: + case CPU_STARTING: printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", cpu); - smp_call_function_single(cpu, hardware_enable, NULL, 1); + hardware_enable(NULL); break; } return NOTIFY_OK; @@ -2096,7 +2096,6 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, static struct notifier_block kvm_cpu_notifier = { .notifier_call = kvm_cpu_hotplug, - .priority = 20, /* must be > scheduler priority */ }; static int vm_stat_get(void *_offset, u64 *val) -- cgit v1.2.3-70-g09d2 From 6bbfb2653177a00f70e57e53625502d43804fed0 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Sun, 19 Sep 2010 19:02:31 +0200 Subject: KVM: fix irqfd assign/deassign race I think I see the following (theoretical) race: During irqfd assign, we drop irqfds lock before we schedule inject work. Therefore, deassign running on another CPU could cause shutdown and flush to run before inject, causing user after free in inject. A simple fix it to schedule inject under the lock. Signed-off-by: Michael S. Tsirkin Acked-by: Gregory Haskins Signed-off-by: Marcelo Tosatti --- virt/kvm/eventfd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'virt') diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 66cf65b510b..c1f1e3c6298 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -218,7 +218,6 @@ kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi) events = file->f_op->poll(file, &irqfd->pt); list_add_tail(&irqfd->list, &kvm->irqfds.items); - spin_unlock_irq(&kvm->irqfds.lock); /* * Check if there was an event already pending on the eventfd @@ -227,6 +226,8 @@ kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi) if (events & POLLIN) schedule_work(&irqfd->inject); + spin_unlock_irq(&kvm->irqfds.lock); + /* * do not drop the file until the irqfd is fully initialized, otherwise * we might race against the POLLHUP -- cgit v1.2.3-70-g09d2 From ca242ac9960dc61530e25a2c190e4e13fd5f1ecb Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Tue, 21 Sep 2010 19:59:43 +0200 Subject: KVM: Fix reboot on Intel hosts When we reboot, we disable vmx extensions or otherwise INIT gets blocked. If a task on another cpu hits a vmx instruction, it will fault if vmx is disabled. We trap that to avoid a nasty oops and spin until the reboot completes. Problem is, we sleep with interrupts disabled. This blocks smp_send_stop() from running, and the reboot process halts. Fix by enabling interrupts before spinning. KVM-Stable-Tag. Signed-off-by: Avi Kivity Signed-off-by: Marcelo Tosatti --- virt/kvm/kvm_main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'virt') diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d4853a54771..5186e728c53 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1970,10 +1970,12 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, asmlinkage void kvm_handle_fault_on_reboot(void) { - if (kvm_rebooting) + if (kvm_rebooting) { /* spin while reset goes on */ + local_irq_enable(); while (true) ; + } /* Fault while not rebooting. We want the trace. */ BUG(); } -- cgit v1.2.3-70-g09d2