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KVM: introduce id_to_memslot function 

Introduce id_to_memslot to get memslot by slot id

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2011-11-24 19:04:35 +08:00 committed by Avi Kivity
parent be6ba0f096
commit 28a37544fb
6 changed files with 30 additions and 17 deletions
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2
arch/ia64/kvm/kvm-ia64.c
View File

@ -1818,7 +1818,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
if (log->slot >= KVM_MEMORY_SLOTS)
goto out;
memslot = &kvm->memslots->memslots[log->slot];
memslot = id_to_memslot(kvm->memslots, log->slot);
r = -ENOENT;
if (!memslot->dirty_bitmap)
goto out;

2
arch/powerpc/kvm/book3s.c
View File

@ -498,7 +498,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
/* If nothing is dirty, don't bother messing with page tables. */
if (is_dirty) {
memslot = &kvm->memslots->memslots[log->slot];
memslot = id_to_memslot(kvm->memslots, log->slot);
ga = memslot->base_gfn << PAGE_SHIFT;
ga_end = ga + (memslot->npages << PAGE_SHIFT);

6
arch/x86/kvm/vmx.c
View File

@ -2711,11 +2711,13 @@ static gva_t rmode_tss_base(struct kvm *kvm)
{
if (!kvm->arch.tss_addr) {
struct kvm_memslots *slots;
struct kvm_memory_slot *slot;
gfn_t base_gfn;
slots = kvm_memslots(kvm);
base_gfn = slots->memslots[0].base_gfn +
kvm->memslots->memslots[0].npages - 3;
slot = id_to_memslot(slots, 0);
base_gfn = slot->base_gfn + slot->npages - 3;
return base_gfn << PAGE_SHIFT;
}
return kvm->arch.tss_addr;

18
arch/x86/kvm/x86.c
View File

@ -3520,7 +3520,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
if (log->slot >= KVM_MEMORY_SLOTS)
goto out;
memslot = &kvm->memslots->memslots[log->slot];
memslot = id_to_memslot(kvm->memslots, log->slot);
r = -ENOENT;
if (!memslot->dirty_bitmap)
goto out;
@ -3531,27 +3531,27 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
/* If nothing is dirty, don't bother messing with page tables. */
if (nr_dirty_pages) {
struct kvm_memslots *slots, *old_slots;
unsigned long *dirty_bitmap;
unsigned long *dirty_bitmap, *dirty_bitmap_head;
dirty_bitmap = memslot->dirty_bitmap_head;
if (memslot->dirty_bitmap == dirty_bitmap)
dirty_bitmap += n / sizeof(long);
memset(dirty_bitmap, 0, n);
dirty_bitmap = memslot->dirty_bitmap;
dirty_bitmap_head = memslot->dirty_bitmap_head;
if (dirty_bitmap == dirty_bitmap_head)
dirty_bitmap_head += n / sizeof(long);
memset(dirty_bitmap_head, 0, n);
r = -ENOMEM;
slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
if (!slots)
goto out;
memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
memslot = &slots->memslots[log->slot];
memslot->dirty_bitmap = dirty_bitmap;
memslot = id_to_memslot(slots, log->slot);
memslot->nr_dirty_pages = 0;
memslot->dirty_bitmap = dirty_bitmap_head;
update_memslots(slots, NULL);
old_slots = kvm->memslots;
rcu_assign_pointer(kvm->memslots, slots);
synchronize_srcu_expedited(&kvm->srcu);
dirty_bitmap = old_slots->memslots[log->slot].dirty_bitmap;
kfree(old_slots);
write_protect_slot(kvm, memslot, dirty_bitmap, nr_dirty_pages);

6
include/linux/kvm_host.h
View File

@ -333,6 +333,12 @@ static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
|| lockdep_is_held(&kvm->slots_lock));
}
static inline struct kvm_memory_slot *
id_to_memslot(struct kvm_memslots *slots, int id)
{
return &slots->memslots[id];
}
#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
#define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }

13
virt/kvm/kvm_main.c
View File

@ -634,8 +634,9 @@ void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
{
if (new) {
int id = new->id;
struct kvm_memory_slot *old = id_to_memslot(slots, id);
slots->memslots[id] = *new;
*old = *new;
if (id >= slots->nmemslots)
slots->nmemslots = id + 1;
}
@ -681,7 +682,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
goto out;
memslot = &kvm->memslots->memslots[mem->slot];
memslot = id_to_memslot(kvm->memslots, mem->slot);
base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
npages = mem->memory_size >> PAGE_SHIFT;
@ -788,12 +789,16 @@ skip_lpage:
#endif /* not defined CONFIG_S390 */
if (!npages) {
struct kvm_memory_slot *slot;
r = -ENOMEM;
slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
GFP_KERNEL);
if (!slots)
goto out_free;
slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
slot = id_to_memslot(slots, mem->slot);
slot->flags |= KVM_MEMSLOT_INVALID;
update_memslots(slots, NULL);
old_memslots = kvm->memslots;
@ -897,7 +902,7 @@ int kvm_get_dirty_log(struct kvm *kvm,
if (log->slot >= KVM_MEMORY_SLOTS)
goto out;
memslot = &kvm->memslots->memslots[log->slot];
memslot = id_to_memslot(kvm->memslots, log->slot);
r = -ENOENT;
if (!memslot->dirty_bitmap)
goto out;