linux-kernel - [PATCH v5 2/4] KVM: x86/mmu: use gfn_to_pfn

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Message-Id: <20211129034317.2964790-3-stevensd@google.com>
Date:   Mon, 29 Nov 2021 12:43:15 +0900
From:   David Stevens <stevensd@...omium.org>
To:     Marc Zyngier <maz@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>
Cc:     James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        David Stevens <stevensd@...omium.org>
Subject: [PATCH v5 2/4] KVM: x86/mmu: use gfn_to_pfn_page

From: David Stevens <stevensd@...omium.org>

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

Signed-off-by: David Stevens <stevensd@...omium.org>
---
 arch/x86/kvm/mmu.h             |  1 +
 arch/x86/kvm/mmu/mmu.c         | 18 +++++++++++-------
 arch/x86/kvm/mmu/paging_tmpl.h |  9 ++++++---
 arch/x86/kvm/x86.c             |  6 ++++--
 4 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 9ae6168d381e..97d94a9612b6 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -164,6 +164,7 @@ struct kvm_page_fault {
 	/* Outputs of kvm_faultin_pfn.  */
 	kvm_pfn_t pfn;
 	hva_t hva;
+	struct page *page;
 	bool map_writable;
 };
 
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 04c00c34517e..0626395ff1d9 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2891,6 +2891,9 @@ void kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault
 	if (unlikely(fault->max_level == PG_LEVEL_4K))
 		return;
 
+	if (!fault->page)
+		return;
+
 	if (is_error_noslot_pfn(fault->pfn) || kvm_is_reserved_pfn(fault->pfn))
 		return;
 
@@ -3950,9 +3953,9 @@ static bool kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
 	}
 
 	async = false;
-	fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, &async,
-					  fault->write, &fault->map_writable,
-					  &fault->hva);
+	fault->pfn = __gfn_to_pfn_page_memslot(slot, fault->gfn, false, &async,
+					       fault->write, &fault->map_writable,
+					       &fault->hva, &fault->page);
 	if (!async)
 		return false; /* *pfn has correct page already */
 
@@ -3966,9 +3969,9 @@ static bool kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
 			goto out_retry;
 	}
 
-	fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, NULL,
-					  fault->write, &fault->map_writable,
-					  &fault->hva);
+	fault->pfn = __gfn_to_pfn_page_memslot(slot, fault->gfn, false, NULL,
+					       fault->write, &fault->map_writable,
+					       &fault->hva, &fault->page);
 	return false;
 
 out_retry:
@@ -4029,7 +4032,8 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault
 		read_unlock(&vcpu->kvm->mmu_lock);
 	else
 		write_unlock(&vcpu->kvm->mmu_lock);
-	kvm_release_pfn_clean(fault->pfn);
+	if (fault->page)
+		put_page(fault->page);
 	return r;
 }
 
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index f87d36898c44..370d52f252a8 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -565,6 +565,7 @@ FNAME(prefetch_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 	unsigned pte_access;
 	gfn_t gfn;
 	kvm_pfn_t pfn;
+	struct page *page;
 
 	if (FNAME(prefetch_invalid_gpte)(vcpu, sp, spte, gpte))
 		return false;
@@ -580,12 +581,13 @@ FNAME(prefetch_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 	if (!slot)
 		return false;
 
-	pfn = gfn_to_pfn_memslot_atomic(slot, gfn);
+	pfn = gfn_to_pfn_page_memslot_atomic(slot, gfn, &page);
 	if (is_error_pfn(pfn))
 		return false;
 
 	mmu_set_spte(vcpu, slot, spte, pte_access, gfn, pfn, NULL);
-	kvm_release_pfn_clean(pfn);
+	if (page)
+		put_page(page);
 	return true;
 }
 
@@ -923,7 +925,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault
 
 out_unlock:
 	write_unlock(&vcpu->kvm->mmu_lock);
-	kvm_release_pfn_clean(fault->pfn);
+	if (fault->page)
+		put_page(fault->page);
 	return r;
 }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5c479ae57693..95f56ec43e0b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7820,6 +7820,7 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 {
 	gpa_t gpa = cr2_or_gpa;
 	kvm_pfn_t pfn;
+	struct page *page;
 
 	if (!(emulation_type & EMULTYPE_ALLOW_RETRY_PF))
 		return false;
@@ -7849,7 +7850,7 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 	 * retry instruction -> write #PF -> emulation fail -> retry
 	 * instruction -> ...
 	 */
-	pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa));
+	pfn = gfn_to_pfn_page(vcpu->kvm, gpa_to_gfn(gpa), &page);
 
 	/*
 	 * If the instruction failed on the error pfn, it can not be fixed,
@@ -7858,7 +7859,8 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 	if (is_error_noslot_pfn(pfn))
 		return false;
 
-	kvm_release_pfn_clean(pfn);
+	if (page)
+		put_page(page);
 
 	/* The instructions are well-emulated on direct mmu. */
 	if (vcpu->arch.mmu->direct_map) {
-- 
2.34.0.rc2.393.gf8c9666880-goog