diff options
| -rw-r--r-- | drivers/kvm/kvm_main.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 80ee427754d2..65c9a31f1d91 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -442,30 +442,32 @@ static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3) gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; int i; - u64 pdpte; u64 *pdpt; int ret; struct page *page; + u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)]; spin_lock(&vcpu->kvm->lock); page = gfn_to_page(vcpu->kvm, pdpt_gfn); - /* FIXME: !page - emulate? 0xff? */ + if (!page) { + ret = 0; + goto out; + } + pdpt = kmap_atomic(page, KM_USER0); + memcpy(pdpte, pdpt+offset, sizeof(pdpte)); + kunmap_atomic(pdpt, KM_USER0); - ret = 1; - for (i = 0; i < 4; ++i) { - pdpte = pdpt[offset + i]; - if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) { + for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { + if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) { ret = 0; goto out; } } + ret = 1; - for (i = 0; i < 4; ++i) - vcpu->pdptrs[i] = pdpt[offset + i]; - + memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs)); out: - kunmap_atomic(pdpt, KM_USER0); spin_unlock(&vcpu->kvm->lock); return ret; |