linux-kernel - [PATCH v5 3/4] KVM: arm64/mmu: use gfn_to_pfn

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20211129034317.2964790-4-stevensd@google.com>
Date:   Mon, 29 Nov 2021 12:43:16 +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 3/4] KVM: arm64/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/arm64/kvm/mmu.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 326cdfec74a1..197fb8afbb94 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -829,7 +829,7 @@ static bool fault_supports_stage2_huge_mapping(struct kvm_memory_slot *memslot,
 static unsigned long
 transparent_hugepage_adjust(struct kvm *kvm, 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;
 
@@ -838,7 +838,8 @@ transparent_hugepage_adjust(struct kvm *kvm, 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 (fault_supports_stage2_huge_mapping(memslot, hva, PMD_SIZE) &&
+	if (*page &&
+	    fault_supports_stage2_huge_mapping(memslot, hva, PMD_SIZE) &&
 	    get_user_mapping_size(kvm, hva) >= PMD_SIZE) {
 		/*
 		 * The address we faulted on is backed by a transparent huge
@@ -859,10 +860,11 @@ transparent_hugepage_adjust(struct kvm *kvm, struct kvm_memory_slot *memslot,
 		 * page accordingly.
 		 */
 		*ipap &= PMD_MASK;
-		kvm_release_pfn_clean(pfn);
+		put_page(*page);
 		pfn &= ~(PTRS_PER_PMD - 1);
-		get_page(pfn_to_page(pfn));
 		*pfnp = pfn;
+		*page = pfn_to_page(pfn);
+		get_page(*page);
 
 		return PMD_SIZE;
 	}
@@ -955,6 +957,7 @@ 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;
@@ -1056,8 +1059,8 @@ 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;
@@ -1102,7 +1105,8 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 			vma_pagesize = fault_granule;
 		else
 			vma_pagesize = transparent_hugepage_adjust(kvm, memslot,
-								   hva, &pfn,
+								   hva,
+								   &pfn, &page,
 								   &fault_ipa);
 	}
 
@@ -1142,14 +1146,17 @@ 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;
 }
 
-- 
2.34.0.rc2.393.gf8c9666880-goog