linux-kernel - [PATCH v12 74/84] KVM: Convert gfn_to_page() to use kvm_follow

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Message-ID: <20240726235234.228822-75-seanjc@google.com>
Date: Fri, 26 Jul 2024 16:52:23 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, Tianrui Zhao <zhaotianrui@...ngson.cn>, 
	Bibo Mao <maobibo@...ngson.cn>, Huacai Chen <chenhuacai@...nel.org>, 
	Michael Ellerman <mpe@...erman.id.au>, Anup Patel <anup@...infault.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Christian Borntraeger <borntraeger@...ux.ibm.com>, 
	Janosch Frank <frankja@...ux.ibm.com>, Claudio Imbrenda <imbrenda@...ux.ibm.com>, 
	Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, loongarch@...ts.linux.dev, linux-mips@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	David Matlack <dmatlack@...gle.com>, David Stevens <stevensd@...omium.org>
Subject: [PATCH v12 74/84] KVM: Convert gfn_to_page() to use kvm_follow_pfn()

Convert gfn_to_page() to the new kvm_follow_pfn() internal API, which will
eventually allow removing gfn_to_pfn() and kvm_pfn_to_refcounted_page().

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 virt/kvm/kvm_main.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 6dc448602751..d0f55a6ecb31 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3181,14 +3181,16 @@ EXPORT_SYMBOL_GPL(kvm_prefetch_pages);
  */
 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
 {
-	kvm_pfn_t pfn;
+	struct page *refcounted_page = NULL;
+	struct kvm_follow_pfn kfp = {
+		.slot = gfn_to_memslot(kvm, gfn),
+		.gfn = gfn,
+		.flags = FOLL_WRITE,
+		.refcounted_page = &refcounted_page,
+	};
 
-	pfn = gfn_to_pfn(kvm, gfn);
-
-	if (is_error_noslot_pfn(pfn))
-		return NULL;
-
-	return kvm_pfn_to_refcounted_page(pfn);
+	(void)kvm_follow_pfn(&kfp);
+	return refcounted_page;
 }
 EXPORT_SYMBOL_GPL(gfn_to_page);
 
-- 
2.46.0.rc1.232.g9752f9e123-goog