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KVM: do not release the error pfn

Browse source 
After commit a2766325cf, the error pfn is replaced by the
error code, it need not be released anymore

[ The patch has been compiling tested for powerpc ]

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 2012-08-03 15:42:10 +08:00 committed by Avi Kivity
parent 6cede2e679
commit cb9aaa30b1
6 changed files with 15 additions and 22 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
arch/powerpc/kvm/e500_tlb.c
View file

@ -524,7 +524,6 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
if (is_error_pfn(pfn)) {
printk(KERN_ERR "Couldn't get real page for gfn %lx!\n",
(long)gfn);
kvm_release_pfn_clean(pfn);
return;
}

7
arch/x86/kvm/mmu.c
View file

@ -2496,7 +2496,9 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
rmap_recycle(vcpu, sptep, gfn);
}
}
kvm_release_pfn_clean(pfn);
if (!is_error_pfn(pfn))
kvm_release_pfn_clean(pfn);
}
static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)
@ -2648,7 +2650,6 @@ static void kvm_send_hwpoison_signal(unsigned long address, struct task_struct *
static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gfn_t gfn, pfn_t pfn)
{
kvm_release_pfn_clean(pfn);
if (pfn == KVM_PFN_ERR_HWPOISON) {
kvm_send_hwpoison_signal(gfn_to_hva(vcpu->kvm, gfn), current);
return 0;
@ -3273,8 +3274,6 @@ static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
if (!async)
return false; /* *pfn has correct page already */
kvm_release_pfn_clean(*pfn);
if (!prefault && can_do_async_pf(vcpu)) {
trace_kvm_try_async_get_page(gva, gfn);
if (kvm_find_async_pf_gfn(vcpu, gfn)) {

4
arch/x86/kvm/mmu_audit.c
View file

@ -116,10 +116,8 @@ static void audit_mappings(struct kvm_vcpu *vcpu, u64 *sptep, int level)
gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt);
pfn = gfn_to_pfn_atomic(vcpu->kvm, gfn);
if (is_error_pfn(pfn)) {
kvm_release_pfn_clean(pfn);
if (is_error_pfn(pfn))
return;
}
hpa = pfn << PAGE_SHIFT;
if ((*sptep & PT64_BASE_ADDR_MASK) != hpa)

8
arch/x86/kvm/paging_tmpl.h
View file

@ -370,10 +370,8 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte);
pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte, true);
pfn = gfn_to_pfn_atomic(vcpu->kvm, gpte_to_gfn(gpte));
if (mmu_invalid_pfn(pfn)) {
kvm_release_pfn_clean(pfn);
if (mmu_invalid_pfn(pfn))
return;
}
/*
* we call mmu_set_spte() with host_writable = true because that
@ -448,10 +446,8 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw,
gfn = gpte_to_gfn(gpte);
pfn = pte_prefetch_gfn_to_pfn(vcpu, gfn,
pte_access & ACC_WRITE_MASK);
if (mmu_invalid_pfn(pfn)) {
kvm_release_pfn_clean(pfn);
if (mmu_invalid_pfn(pfn))
break;
}
mmu_set_spte(vcpu, spte, sp->role.access, pte_access, 0, 0,
NULL, PT_PAGE_TABLE_LEVEL, gfn,

1
virt/kvm/iommu.c
View file

@ -107,7 +107,6 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
*/
pfn = kvm_pin_pages(slot, gfn, page_size);
if (is_error_pfn(pfn)) {
kvm_release_pfn_clean(pfn);
gfn += 1;
continue;
}

16
virt/kvm/kvm_main.c
View file

@ -102,9 +102,6 @@ static bool largepages_enabled = true;
bool kvm_is_mmio_pfn(pfn_t pfn)
{
if (is_error_pfn(pfn))
return false;
if (pfn_valid(pfn)) {
int reserved;
struct page *tail = pfn_to_page(pfn);
@ -1165,11 +1162,14 @@ EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
static struct page *kvm_pfn_to_page(pfn_t pfn)
{
WARN_ON(kvm_is_mmio_pfn(pfn));
if (is_error_pfn(pfn) || kvm_is_mmio_pfn(pfn))
if (is_error_pfn(pfn))
return KVM_ERR_PTR_BAD_PAGE;
if (kvm_is_mmio_pfn(pfn)) {
WARN_ON(1);
return KVM_ERR_PTR_BAD_PAGE;
}
return pfn_to_page(pfn);
}
@ -1193,7 +1193,9 @@ EXPORT_SYMBOL_GPL(kvm_release_page_clean);
void kvm_release_pfn_clean(pfn_t pfn)
{
if (!is_error_pfn(pfn) && !kvm_is_mmio_pfn(pfn))
WARN_ON(is_error_pfn(pfn));
if (!kvm_is_mmio_pfn(pfn))
put_page(pfn_to_page(pfn));
}
EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);