[PATCH v5 1/7] KVM: guest_memfd: Plumb the number of pages and max order into .invalidate()

[Sean Christopherson <seanjc@google.com>]

Plumb the number of pages to "invalidate", i.e. reclaim, along with the max
order with which the pages can be mapped.  This will allow x86 to combine
its vendor-specific implementations for conversion and reclaim, a.k.a.
preparation and invalidation, into a single hook.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/x86.c       | 4 ++--
 include/linux/kvm_host.h | 2 +-
 virt/kvm/guest_memfd.c   | 7 ++-----
 3 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1f5dc685f049..a2cbf6fae118 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10627,9 +10627,9 @@ int kvm_arch_gmem_prepare(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn, int max_ord
 #endif
 
 #ifdef CONFIG_HAVE_KVM_ARCH_GMEM_INVALIDATE
-void kvm_arch_gmem_invalidate(kvm_pfn_t start, kvm_pfn_t end)
+void kvm_arch_gmem_invalidate(kvm_pfn_t pfn, kvm_pfn_t nr_pages, int max_order)
 {
-	kvm_x86_call(gmem_invalidate)(start, end);
+	kvm_x86_call(gmem_invalidate)(pfn, pfn + nr_pages);
 }
 void kvm_arch_gmem_invalidate_range(struct kvm *kvm, struct kvm_gfn_range *range)
 {
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 9db6eb4023c4..996b39ebdb68 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2614,7 +2614,7 @@ long kvm_gmem_populate(struct kvm *kvm, gfn_t start_gfn, void __user *src,
 #endif
 
 #ifdef CONFIG_HAVE_KVM_ARCH_GMEM_INVALIDATE
-void kvm_arch_gmem_invalidate(kvm_pfn_t start, kvm_pfn_t end);
+void kvm_arch_gmem_invalidate(kvm_pfn_t pfn, kvm_pfn_t nr_pages, int order);
 void kvm_arch_gmem_invalidate_range(struct kvm *kvm, struct kvm_gfn_range *range);
 #endif
 
diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c
index 171a9da1b685..99c070bfd446 100644
--- a/virt/kvm/guest_memfd.c
+++ b/virt/kvm/guest_memfd.c
@@ -530,11 +530,8 @@ static int kvm_gmem_error_folio(struct address_space *mapping, struct folio *fol
 #ifdef CONFIG_HAVE_KVM_ARCH_GMEM_INVALIDATE
 static void kvm_gmem_free_folio(struct folio *folio)
 {
-	struct page *page = folio_page(folio, 0);
-	kvm_pfn_t pfn = page_to_pfn(page);
-	int order = folio_order(folio);
-
-	kvm_arch_gmem_invalidate(pfn, pfn + (1ul << order));
+	kvm_arch_gmem_invalidate(folio_file_pfn(folio, 0), folio_nr_pages(folio),
+				 folio_order(folio));
 }
 #endif
 
-- 
2.55.0.141.g00534a21ce-goog