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author | Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de> | 2015-10-23 03:29:33 +0200 |
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committer | Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de> | 2015-10-23 03:29:33 +0200 |
commit | 15dfd0df63ce6847081d09b2bbd567cc0cc4eae1 (patch) | |
tree | 3b73f24fcef970bfcace3cbb297cfa57f3994682 /virt/kvm/kvm_main.c | |
parent | 328aa7a45af61bc0060c80847daa67fef7b9c0d0 (diff) | |
parent | 0149138c4142da287d23f9d5c6038f7fb5e30ac2 (diff) | |
download | kernel_samsung_smdk4412-15dfd0df63ce6847081d09b2bbd567cc0cc4eae1.zip kernel_samsung_smdk4412-15dfd0df63ce6847081d09b2bbd567cc0cc4eae1.tar.gz kernel_samsung_smdk4412-15dfd0df63ce6847081d09b2bbd567cc0cc4eae1.tar.bz2 |
initial merge with 3.2.72
Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r-- | virt/kvm/kvm_main.c | 260 |
1 files changed, 230 insertions, 30 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index caa3bb1..53c1746 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -47,9 +47,12 @@ #include <linux/srcu.h> #include <linux/hugetlb.h> #include <linux/slab.h> +#include <linux/sort.h> +#include <linux/bsearch.h> #include <asm/processor.h> #include <asm/io.h> +#include <asm/ioctl.h> #include <asm/uaccess.h> #include <asm/pgtable.h> @@ -84,6 +87,10 @@ struct dentry *kvm_debugfs_dir; static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, unsigned long arg); +#ifdef CONFIG_COMPAT +static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, + unsigned long arg); +#endif static int hardware_enable_all(void); static void hardware_disable_all(void); @@ -97,8 +104,8 @@ static bool largepages_enabled = true; static struct page *hwpoison_page; static pfn_t hwpoison_pfn; -static struct page *fault_page; -static pfn_t fault_pfn; +struct page *fault_page; +pfn_t fault_pfn; inline int kvm_is_mmio_pfn(pfn_t pfn) { @@ -283,15 +290,15 @@ static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, */ idx = srcu_read_lock(&kvm->srcu); spin_lock(&kvm->mmu_lock); + kvm->mmu_notifier_seq++; need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; - spin_unlock(&kvm->mmu_lock); - srcu_read_unlock(&kvm->srcu, idx); - /* we've to flush the tlb before the pages can be freed */ if (need_tlb_flush) kvm_flush_remote_tlbs(kvm); + spin_unlock(&kvm->mmu_lock); + srcu_read_unlock(&kvm->srcu, idx); } static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, @@ -329,12 +336,12 @@ static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, for (; start < end; start += PAGE_SIZE) need_tlb_flush |= kvm_unmap_hva(kvm, start); need_tlb_flush |= kvm->tlbs_dirty; - spin_unlock(&kvm->mmu_lock); - srcu_read_unlock(&kvm->srcu, idx); - /* we've to flush the tlb before the pages can be freed */ if (need_tlb_flush) kvm_flush_remote_tlbs(kvm); + + spin_unlock(&kvm->mmu_lock); + srcu_read_unlock(&kvm->srcu, idx); } static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, @@ -372,13 +379,14 @@ static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, idx = srcu_read_lock(&kvm->srcu); spin_lock(&kvm->mmu_lock); - young = kvm_age_hva(kvm, address); - spin_unlock(&kvm->mmu_lock); - srcu_read_unlock(&kvm->srcu, idx); + young = kvm_age_hva(kvm, address); if (young) kvm_flush_remote_tlbs(kvm); + spin_unlock(&kvm->mmu_lock); + srcu_read_unlock(&kvm->srcu, idx); + return young; } @@ -767,7 +775,7 @@ skip_lpage: new.userspace_addr = mem->userspace_addr; #endif /* not defined CONFIG_S390 */ - if (!npages) { + if (!npages || base_gfn != old.base_gfn) { r = -ENOMEM; slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); if (!slots) @@ -781,8 +789,10 @@ skip_lpage: old_memslots = kvm->memslots; rcu_assign_pointer(kvm->memslots, slots); synchronize_srcu_expedited(&kvm->srcu); - /* From this point no new shadow pages pointing to a deleted - * memslot will be created. + /* slot was deleted or moved, clear iommu mapping */ + kvm_iommu_unmap_pages(kvm, &old); + /* From this point no new shadow pages pointing to a deleted, + * or moved, memslot will be created. * * validation of sp->gfn happens in: * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) @@ -813,6 +823,13 @@ skip_lpage: slots->nmemslots = mem->slot + 1; slots->generation++; + /* map new memory slot into the iommu */ + if (npages) { + r = kvm_iommu_map_pages(kvm, &new); + if (r) + goto out_slots; + } + /* actual memory is freed via old in kvm_free_physmem_slot below */ if (!npages) { new.rmap = NULL; @@ -828,11 +845,20 @@ skip_lpage: kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); + /* + * If the new memory slot is created, we need to clear all + * mmio sptes. + */ + if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT) + kvm_arch_flush_shadow(kvm); + kvm_free_physmem_slot(&old, &new); kfree(old_memslots); return 0; +out_slots: + kfree(slots); out_free: kvm_free_physmem_slot(&new, &old); out: @@ -928,6 +954,18 @@ int is_fault_pfn(pfn_t pfn) } EXPORT_SYMBOL_GPL(is_fault_pfn); +int is_noslot_pfn(pfn_t pfn) +{ + return pfn == bad_pfn; +} +EXPORT_SYMBOL_GPL(is_noslot_pfn); + +int is_invalid_pfn(pfn_t pfn) +{ + return pfn == hwpoison_pfn || pfn == fault_pfn; +} +EXPORT_SYMBOL_GPL(is_invalid_pfn); + static inline unsigned long bad_hva(void) { return PAGE_OFFSET; @@ -1346,7 +1384,7 @@ int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, addr = gfn_to_hva(kvm, gfn); if (kvm_is_error_hva(addr)) return -EFAULT; - r = copy_to_user((void __user *)addr + offset, data, len); + r = __copy_to_user((void __user *)addr + offset, data, len); if (r) return -EFAULT; mark_page_dirty(kvm, gfn); @@ -1407,7 +1445,6 @@ int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, /* Use the slow path for cross page reads and writes. */ ghc->memslot = NULL; } - return 0; } EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); @@ -1429,7 +1466,7 @@ int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, if (kvm_is_error_hva(ghc->hva)) return -EFAULT; - r = copy_to_user((void __user *)ghc->hva, data, len); + r = __copy_to_user((void __user *)ghc->hva, data, len); if (r) return -EFAULT; mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); @@ -1438,6 +1475,31 @@ int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, } EXPORT_SYMBOL_GPL(kvm_write_guest_cached); +int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, + void *data, unsigned long len) +{ + struct kvm_memslots *slots = kvm_memslots(kvm); + int r; + + BUG_ON(len > ghc->len); + + if (slots->generation != ghc->generation) + kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); + + if (unlikely(!ghc->memslot)) + return kvm_read_guest(kvm, ghc->gpa, data, len); + + if (kvm_is_error_hva(ghc->hva)) + return -EFAULT; + + r = __copy_from_user(data, (void __user *)ghc->hva, len); + if (r) + return -EFAULT; + + return 0; +} +EXPORT_SYMBOL_GPL(kvm_read_guest_cached); + int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) { return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, @@ -1610,7 +1672,9 @@ static int kvm_vcpu_release(struct inode *inode, struct file *filp) static struct file_operations kvm_vcpu_fops = { .release = kvm_vcpu_release, .unlocked_ioctl = kvm_vcpu_ioctl, - .compat_ioctl = kvm_vcpu_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = kvm_vcpu_compat_ioctl, +#endif .mmap = kvm_vcpu_mmap, .llseek = noop_llseek, }; @@ -1631,6 +1695,9 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) int r; struct kvm_vcpu *vcpu, *v; + if (id >= KVM_MAX_VCPUS) + return -EINVAL; + vcpu = kvm_arch_vcpu_create(kvm, id); if (IS_ERR(vcpu)) return PTR_ERR(vcpu); @@ -1708,6 +1775,9 @@ static long kvm_vcpu_ioctl(struct file *filp, if (vcpu->kvm->mm != current->mm) return -EIO; + if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) + return -EINVAL; + #if defined(CONFIG_S390) || defined(CONFIG_PPC) /* * Special cases: vcpu ioctls that are asynchronous to vcpu execution, @@ -1903,6 +1973,50 @@ out: return r; } +#ifdef CONFIG_COMPAT +static long kvm_vcpu_compat_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm_vcpu *vcpu = filp->private_data; + void __user *argp = compat_ptr(arg); + int r; + + if (vcpu->kvm->mm != current->mm) + return -EIO; + + switch (ioctl) { + case KVM_SET_SIGNAL_MASK: { + struct kvm_signal_mask __user *sigmask_arg = argp; + struct kvm_signal_mask kvm_sigmask; + compat_sigset_t csigset; + sigset_t sigset; + + if (argp) { + r = -EFAULT; + if (copy_from_user(&kvm_sigmask, argp, + sizeof kvm_sigmask)) + goto out; + r = -EINVAL; + if (kvm_sigmask.len != sizeof csigset) + goto out; + r = -EFAULT; + if (copy_from_user(&csigset, sigmask_arg->sigset, + sizeof csigset)) + goto out; + } + sigset_from_compat(&sigset, &csigset); + r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); + break; + } + default: + r = kvm_vcpu_ioctl(filp, ioctl, arg); + } + +out: + return r; +} +#endif + static long kvm_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -2330,24 +2444,92 @@ static void kvm_io_bus_destroy(struct kvm_io_bus *bus) int i; for (i = 0; i < bus->dev_count; i++) { - struct kvm_io_device *pos = bus->devs[i]; + struct kvm_io_device *pos = bus->range[i].dev; kvm_iodevice_destructor(pos); } kfree(bus); } +int kvm_io_bus_sort_cmp(const void *p1, const void *p2) +{ + const struct kvm_io_range *r1 = p1; + const struct kvm_io_range *r2 = p2; + + if (r1->addr < r2->addr) + return -1; + if (r1->addr + r1->len > r2->addr + r2->len) + return 1; + return 0; +} + +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, + .dev = dev, + }; + + sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), + kvm_io_bus_sort_cmp, NULL); + + return 0; +} + +int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, + gpa_t addr, int len) +{ + struct kvm_io_range *range, key; + int off; + + key = (struct kvm_io_range) { + .addr = addr, + .len = len, + }; + + range = bsearch(&key, bus->range, bus->dev_count, + sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); + if (range == NULL) + return -ENOENT; + + off = range - bus->range; + + while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0) + off--; + + return off; +} + /* kvm_io_bus_write - called under kvm->slots_lock */ int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len, const void *val) { - int i; + int idx; struct kvm_io_bus *bus; + struct kvm_io_range range; + + range = (struct kvm_io_range) { + .addr = addr, + .len = len, + }; bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); - for (i = 0; i < bus->dev_count; i++) - if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) + idx = kvm_io_bus_get_first_dev(bus, addr, len); + if (idx < 0) + return -EOPNOTSUPP; + + while (idx < bus->dev_count && + kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { + if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val)) return 0; + idx++; + } + return -EOPNOTSUPP; } @@ -2355,19 +2537,33 @@ int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len, void *val) { - int i; + int idx; struct kvm_io_bus *bus; + struct kvm_io_range range; + + range = (struct kvm_io_range) { + .addr = addr, + .len = len, + }; bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); - for (i = 0; i < bus->dev_count; i++) - if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) + idx = kvm_io_bus_get_first_dev(bus, addr, len); + if (idx < 0) + return -EOPNOTSUPP; + + while (idx < bus->dev_count && + kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { + if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val)) return 0; + idx++; + } + return -EOPNOTSUPP; } /* Caller must hold slots_lock. */ -int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, - struct kvm_io_device *dev) +int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, + int len, struct kvm_io_device *dev) { struct kvm_io_bus *new_bus, *bus; @@ -2379,7 +2575,7 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, if (!new_bus) return -ENOMEM; memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); - new_bus->devs[new_bus->dev_count++] = dev; + kvm_io_bus_insert_dev(new_bus, dev, addr, len); rcu_assign_pointer(kvm->buses[bus_idx], new_bus); synchronize_srcu_expedited(&kvm->srcu); kfree(bus); @@ -2403,9 +2599,13 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, r = -ENOENT; for (i = 0; i < new_bus->dev_count; i++) - if (new_bus->devs[i] == dev) { + if (new_bus->range[i].dev == dev) { r = 0; - new_bus->devs[i] = new_bus->devs[--new_bus->dev_count]; + 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; } |