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KVM: introduce kvm->srcu and convert kvm_set_memory_region to SRCU update

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Use two steps for memslot deletion: mark the slot invalid (which stops
instantiation of new shadow pages for that slot, but allows destruction),
then instantiate the new empty slot.

Also simplifies kvm_handle_hva locking.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Marcelo Tosatti
2009-12-23 14:35:21 -02:00
parent 3ad26d8139
commit bc6678a33d
8 changed files with 136 additions and 64 deletions
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7
include/linux/kvm_host.h
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@ -162,6 +162,7 @@ struct kvm {
struct rw_semaphore slots_lock;
struct mm_struct *mm; /* userspace tied to this vm */
struct kvm_memslots *memslots;
struct srcu_struct srcu;
#ifdef CONFIG_KVM_APIC_ARCHITECTURE
u32 bsp_vcpu_id;
struct kvm_vcpu *bsp_vcpu;
@ -275,6 +276,7 @@ void kvm_set_page_accessed(struct page *page);
pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
struct kvm_memory_slot *slot, gfn_t gfn);
int memslot_id(struct kvm *kvm, gfn_t gfn);
void kvm_release_pfn_dirty(pfn_t);
void kvm_release_pfn_clean(pfn_t pfn);
void kvm_set_pfn_dirty(pfn_t pfn);
@ -490,11 +492,6 @@ static inline void kvm_guest_exit(void)
current->flags &= ~PF_VCPU;
}
static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
{
return slot - kvm->memslots->memslots;
}
static inline gpa_t gfn_to_gpa(gfn_t gfn)
{
return (gpa_t)gfn << PAGE_SHIFT;