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authorLinus Torvalds <torvalds@linux-foundation.org>2012-05-09 11:14:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-09 11:14:13 -0700
commit63f4711aec01586e92c26da08a24bff0b8d16aa2 (patch)
tree1e15b5a5820e60357274472d9d7ce6f97e808322 /arch/powerpc
parent6a5beacca8681fb6602649dd8cf5ba50a90befb3 (diff)
parent331b646d60b0c3885208e1e02bd9f40319953efc (diff)
Merge git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM fixes from Avi Kivity: "Two asynchronous page fault fixes (one guest, one host), a powerpc page refcount fix, and an ia64 build fix." * git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: ia64: fix build due to typo KVM: PPC: Book3S HV: Fix refcounting of hugepages KVM: Do not take reference to mm during async #PF KVM: ensure async PF event wakes up vcpu from halt
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu_hv.c22
-rw-r--r--arch/powerpc/kvm/book3s_hv.c2
2 files changed, 13 insertions, 11 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index ddc485a529f..c3beaeef3f6 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -258,6 +258,8 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn,
!(memslot->userspace_addr & (s - 1))) {
start &= ~(s - 1);
pgsize = s;
+ get_page(hpage);
+ put_page(page);
page = hpage;
}
}
@@ -281,11 +283,8 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn,
err = 0;
out:
- if (got) {
- if (PageHuge(page))
- page = compound_head(page);
+ if (got)
put_page(page);
- }
return err;
up_err:
@@ -678,8 +677,15 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
SetPageDirty(page);
out_put:
- if (page)
- put_page(page);
+ if (page) {
+ /*
+ * We drop pages[0] here, not page because page might
+ * have been set to the head page of a compound, but
+ * we have to drop the reference on the correct tail
+ * page to match the get inside gup()
+ */
+ put_page(pages[0]);
+ }
return ret;
out_unlock:
@@ -979,6 +985,7 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa,
pa = *physp;
}
page = pfn_to_page(pa >> PAGE_SHIFT);
+ get_page(page);
} else {
hva = gfn_to_hva_memslot(memslot, gfn);
npages = get_user_pages_fast(hva, 1, 1, pages);
@@ -991,8 +998,6 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa,
page = compound_head(page);
psize <<= compound_order(page);
}
- if (!kvm->arch.using_mmu_notifiers)
- get_page(page);
offset = gpa & (psize - 1);
if (nb_ret)
*nb_ret = psize - offset;
@@ -1003,7 +1008,6 @@ void kvmppc_unpin_guest_page(struct kvm *kvm, void *va)
{
struct page *page = virt_to_page(va);
- page = compound_head(page);
put_page(page);
}
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 01294a5099d..108d1f58017 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1192,8 +1192,6 @@ static void unpin_slot(struct kvm *kvm, int slot_id)
continue;
pfn = physp[j] >> PAGE_SHIFT;
page = pfn_to_page(pfn);
- if (PageHuge(page))
- page = compound_head(page);
SetPageDirty(page);
put_page(page);
}