diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-24 16:17:30 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-24 16:17:30 -0700 |
commit | 07acfc2a9349a8ce45b236c2624dad452001966b (patch) | |
tree | c40f3eaac18a8320e65af220979223b5cd632b1b /virt/kvm/kvm_main.c | |
parent | b5f4035adfffbcc6b478de5b8c44b618b3124aff (diff) | |
parent | 322728e55aa7834e2fab2786b76df183c4843a12 (diff) | |
download | linux-07acfc2a9349a8ce45b236c2624dad452001966b.tar.bz2 |
Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM changes from Avi Kivity:
"Changes include additional instruction emulation, page-crossing MMIO,
faster dirty logging, preventing the watchdog from killing a stopped
guest, module autoload, a new MSI ABI, and some minor optimizations
and fixes. Outside x86 we have a small s390 and a very large ppc
update.
Regarding the new (for kvm) rebaseless workflow, some of the patches
that were merged before we switch trees had to be rebased, while
others are true pulls. In either case the signoffs should be correct
now."
Fix up trivial conflicts in Documentation/feature-removal-schedule.txt
arch/powerpc/kvm/book3s_segment.S and arch/x86/include/asm/kvm_para.h.
I suspect the kvm_para.h resolution ends up doing the "do I have cpuid"
check effectively twice (it was done differently in two different
commits), but better safe than sorry ;)
* 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (125 commits)
KVM: make asm-generic/kvm_para.h have an ifdef __KERNEL__ block
KVM: s390: onereg for timer related registers
KVM: s390: epoch difference and TOD programmable field
KVM: s390: KVM_GET/SET_ONEREG for s390
KVM: s390: add capability indicating COW support
KVM: Fix mmu_reload() clash with nested vmx event injection
KVM: MMU: Don't use RCU for lockless shadow walking
KVM: VMX: Optimize %ds, %es reload
KVM: VMX: Fix %ds/%es clobber
KVM: x86 emulator: convert bsf/bsr instructions to emulate_2op_SrcV_nobyte()
KVM: VMX: unlike vmcs on fail path
KVM: PPC: Emulator: clean up SPR reads and writes
KVM: PPC: Emulator: clean up instruction parsing
kvm/powerpc: Add new ioctl to retreive server MMU infos
kvm/book3s: Make kernel emulated H_PUT_TCE available for "PR" KVM
KVM: PPC: bookehv: Fix r8/r13 storing in level exception handler
KVM: PPC: Book3S: Enable IRQs during exit handling
KVM: PPC: Fix PR KVM on POWER7 bare metal
KVM: PPC: Fix stbux emulation
KVM: PPC: bookehv: Use lwz/stw instead of PPC_LL/PPC_STL for 32-bit fields
...
Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r-- | virt/kvm/kvm_main.c | 132 |
1 files changed, 87 insertions, 45 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 9739b533ca2e..7e140683ff14 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -522,12 +522,11 @@ static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) return; if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE) - vfree(memslot->dirty_bitmap_head); + vfree(memslot->dirty_bitmap); else - kfree(memslot->dirty_bitmap_head); + kfree(memslot->dirty_bitmap); memslot->dirty_bitmap = NULL; - memslot->dirty_bitmap_head = NULL; } /* @@ -611,8 +610,7 @@ static int kvm_vm_release(struct inode *inode, struct file *filp) /* * Allocation size is twice as large as the actual dirty bitmap size. - * This makes it possible to do double buffering: see x86's - * kvm_vm_ioctl_get_dirty_log(). + * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. */ static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) { @@ -627,8 +625,6 @@ static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) if (!memslot->dirty_bitmap) return -ENOMEM; - memslot->dirty_bitmap_head = memslot->dirty_bitmap; - memslot->nr_dirty_pages = 0; #endif /* !CONFIG_S390 */ return 0; } @@ -1477,8 +1473,8 @@ void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, if (memslot && memslot->dirty_bitmap) { unsigned long rel_gfn = gfn - memslot->base_gfn; - if (!test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap)) - memslot->nr_dirty_pages++; + /* TODO: introduce set_bit_le() and use it */ + test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap); } } @@ -1515,6 +1511,30 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu) finish_wait(&vcpu->wq, &wait); } +#ifndef CONFIG_S390 +/* + * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. + */ +void kvm_vcpu_kick(struct kvm_vcpu *vcpu) +{ + int me; + int cpu = vcpu->cpu; + wait_queue_head_t *wqp; + + wqp = kvm_arch_vcpu_wq(vcpu); + if (waitqueue_active(wqp)) { + wake_up_interruptible(wqp); + ++vcpu->stat.halt_wakeup; + } + + me = get_cpu(); + if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) + if (kvm_arch_vcpu_should_kick(vcpu)) + smp_send_reschedule(cpu); + put_cpu(); +} +#endif /* !CONFIG_S390 */ + void kvm_resched(struct kvm_vcpu *vcpu) { if (!need_resched()) @@ -1523,6 +1543,31 @@ void kvm_resched(struct kvm_vcpu *vcpu) } EXPORT_SYMBOL_GPL(kvm_resched); +bool kvm_vcpu_yield_to(struct kvm_vcpu *target) +{ + struct pid *pid; + struct task_struct *task = NULL; + + rcu_read_lock(); + pid = rcu_dereference(target->pid); + if (pid) + task = get_pid_task(target->pid, PIDTYPE_PID); + rcu_read_unlock(); + if (!task) + return false; + if (task->flags & PF_VCPU) { + put_task_struct(task); + return false; + } + if (yield_to(task, 1)) { + put_task_struct(task); + return true; + } + put_task_struct(task); + return false; +} +EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); + void kvm_vcpu_on_spin(struct kvm_vcpu *me) { struct kvm *kvm = me->kvm; @@ -1541,8 +1586,6 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me) */ for (pass = 0; pass < 2 && !yielded; pass++) { kvm_for_each_vcpu(i, vcpu, kvm) { - struct task_struct *task = NULL; - struct pid *pid; if (!pass && i < last_boosted_vcpu) { i = last_boosted_vcpu; continue; @@ -1552,24 +1595,11 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me) continue; if (waitqueue_active(&vcpu->wq)) continue; - rcu_read_lock(); - pid = rcu_dereference(vcpu->pid); - if (pid) - task = get_pid_task(vcpu->pid, PIDTYPE_PID); - rcu_read_unlock(); - if (!task) - continue; - if (task->flags & PF_VCPU) { - put_task_struct(task); - continue; - } - if (yield_to(task, 1)) { - put_task_struct(task); + if (kvm_vcpu_yield_to(vcpu)) { kvm->last_boosted_vcpu = i; yielded = 1; break; } - put_task_struct(task); } } } @@ -2040,6 +2070,17 @@ static long kvm_vm_ioctl(struct file *filp, mutex_unlock(&kvm->lock); break; #endif +#ifdef CONFIG_HAVE_KVM_MSI + case KVM_SIGNAL_MSI: { + struct kvm_msi msi; + + r = -EFAULT; + if (copy_from_user(&msi, argp, sizeof msi)) + goto out; + r = kvm_send_userspace_msi(kvm, &msi); + break; + } +#endif default: r = kvm_arch_vm_ioctl(filp, ioctl, arg); if (r == -ENOTTY) @@ -2168,6 +2209,9 @@ static long kvm_dev_ioctl_check_extension_generic(long arg) case KVM_CAP_SET_BOOT_CPU_ID: #endif case KVM_CAP_INTERNAL_ERROR_DATA: +#ifdef CONFIG_HAVE_KVM_MSI + case KVM_CAP_SIGNAL_MSI: +#endif return 1; #ifdef CONFIG_HAVE_KVM_IRQCHIP case KVM_CAP_IRQ_ROUTING: @@ -2394,9 +2438,6 @@ int kvm_io_bus_sort_cmp(const void *p1, const void *p2) int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, gpa_t addr, int len) { - if (bus->dev_count == NR_IOBUS_DEVS) - return -ENOSPC; - bus->range[bus->dev_count++] = (struct kvm_io_range) { .addr = addr, .len = len, @@ -2496,12 +2537,15 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, struct kvm_io_bus *new_bus, *bus; bus = kvm->buses[bus_idx]; - if (bus->dev_count > NR_IOBUS_DEVS-1) + if (bus->dev_count > NR_IOBUS_DEVS - 1) return -ENOSPC; - new_bus = kmemdup(bus, sizeof(struct kvm_io_bus), GFP_KERNEL); + new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) * + sizeof(struct kvm_io_range)), GFP_KERNEL); if (!new_bus) return -ENOMEM; + memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * + sizeof(struct kvm_io_range))); kvm_io_bus_insert_dev(new_bus, dev, addr, len); rcu_assign_pointer(kvm->buses[bus_idx], new_bus); synchronize_srcu_expedited(&kvm->srcu); @@ -2518,27 +2562,25 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, struct kvm_io_bus *new_bus, *bus; bus = kvm->buses[bus_idx]; - - new_bus = kmemdup(bus, sizeof(*bus), GFP_KERNEL); - if (!new_bus) - return -ENOMEM; - r = -ENOENT; - for (i = 0; i < new_bus->dev_count; i++) - if (new_bus->range[i].dev == dev) { + for (i = 0; i < bus->dev_count; i++) + if (bus->range[i].dev == dev) { r = 0; - new_bus->dev_count--; - new_bus->range[i] = new_bus->range[new_bus->dev_count]; - sort(new_bus->range, new_bus->dev_count, - sizeof(struct kvm_io_range), - kvm_io_bus_sort_cmp, NULL); break; } - if (r) { - kfree(new_bus); + if (r) return r; - } + + new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) * + sizeof(struct kvm_io_range)), GFP_KERNEL); + if (!new_bus) + return -ENOMEM; + + memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); + new_bus->dev_count--; + memcpy(new_bus->range + i, bus->range + i + 1, + (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); rcu_assign_pointer(kvm->buses[bus_idx], new_bus); synchronize_srcu_expedited(&kvm->srcu); |