[PATCH v2 4/5] KVM: arm64/mmu: use gfn_to_pfn_page

David Stevens
2021-06-25T10:11:58Z

Covert usages of the deprecated gfn_to_pfn functions to the new
gfn_to_pfn_page functions.

Signed-off-by: David Stevens <stevensd@chromium.org>
---
arch/arm64/kvm/mmu.c | 26 ++++++++++++++++----------
1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index c10207fed2f3..c29da690ed74 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -780,7 +780,7 @@ static bool fault_supports_stage2_huge_mapping(struct kvm_memory_slot *memslot,
static unsigned long
transparent_hugepage_adjust(struct kvm_memory_slot *memslot,
unsigned long hva, kvm_pfn_t *pfnp,
- phys_addr_t *ipap)
+ struct page **page, phys_addr_t *ipap)
{
kvm_pfn_t pfn = *pfnp;

@@ -789,7 +789,7 @@ transparent_hugepage_adjust(struct kvm_memory_slot *memslot,
* sure that the HVA and IPA are sufficiently aligned and that the
* block map is contained within the memslot.
*/
- if (kvm_is_transparent_hugepage(pfn) &&
+ if (*page && kvm_is_transparent_hugepage(pfn) &&
fault_supports_stage2_huge_mapping(memslot, hva, PMD_SIZE)) {
/*
* The address we faulted on is backed by a transparent huge
@@ -810,10 +810,11 @@ transparent_hugepage_adjust(struct kvm_memory_slot *memslot,
* page accordingly.
*/
*ipap &= PMD_MASK;
- kvm_release_pfn_clean(pfn);
+ put_page(*page);
pfn &= ~(PTRS_PER_PMD - 1);
- kvm_get_pfn(pfn);
*pfnp = pfn;
+ *page = pfn_to_page(pfn);
+ get_page(*page);

return PMD_SIZE;
}
@@ -837,6 +838,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
short vma_shift;
gfn_t gfn;
kvm_pfn_t pfn;
+ struct page *page;
bool logging_active = memslot_is_logging(memslot);
unsigned long fault_level = kvm_vcpu_trap_get_fault_level(vcpu);
unsigned long vma_pagesize, fault_granule;
@@ -933,8 +935,8 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
*/
smp_rmb();

- pfn = __gfn_to_pfn_memslot(memslot, gfn, false, NULL,
- write_fault, &writable, NULL);
+ pfn = __gfn_to_pfn_page_memslot(memslot, gfn, false, NULL,
+ write_fault, &writable, NULL, &page);
if (pfn == KVM_PFN_ERR_HWPOISON) {
kvm_send_hwpoison_signal(hva, vma_shift);
return 0;
@@ -967,7 +969,8 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
*/
if (vma_pagesize == PAGE_SIZE && !force_pte)
vma_pagesize = transparent_hugepage_adjust(memslot, hva,
- &pfn, &fault_ipa);
+ &pfn, &page,
+ &fault_ipa);
if (writable)
prot |= KVM_PGTABLE_PROT_W;

@@ -999,14 +1002,17 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,

/* Mark the page dirty only if the fault is handled successfully */
if (writable && !ret) {
- kvm_set_pfn_dirty(pfn);
+ if (page)
+ kvm_set_pfn_dirty(pfn);
mark_page_dirty_in_slot(kvm, memslot, gfn);
}

out_unlock:
spin_unlock(&kvm->mmu_lock);
- kvm_set_pfn_accessed(pfn);
- kvm_release_pfn_clean(pfn);
+ if (page) {
+ kvm_set_pfn_accessed(pfn);
+ put_page(page);
+ }
return ret != -EAGAIN ? ret : 0;