linux-kernel - [PATCH v3 1/8] KVM: x86/mmu: Deduplicate rmap freeing

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: <20210506184241.618958-2-bgardon@google.com>
Date:   Thu,  6 May 2021 11:42:34 -0700
From:   Ben Gardon <bgardon@...gle.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Peter Xu <peterx@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Peter Shier <pshier@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>,
        Kai Huang <kai.huang@...el.com>,
        Keqian Zhu <zhukeqian1@...wei.com>,
        Ben Gardon <bgardon@...gle.com>
Subject: [PATCH v3 1/8] KVM: x86/mmu: Deduplicate rmap freeing

Small code deduplication. No functional change expected.

Signed-off-by: Ben Gardon <bgardon@...gle.com>
---
 arch/x86/kvm/x86.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cf3b67679cf0..5bcf07465c47 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10818,17 +10818,23 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
 	kvm_hv_destroy_vm(kvm);
 }
 
-void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
+static void free_memslot_rmap(struct kvm_memory_slot *slot)
 {
 	int i;
 
 	for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
 		kvfree(slot->arch.rmap[i]);
 		slot->arch.rmap[i] = NULL;
+	}
+}
 
-		if (i == 0)
-			continue;
+void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
+{
+	int i;
+
+	free_memslot_rmap(slot);
 
+	for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
 		kvfree(slot->arch.lpage_info[i - 1]);
 		slot->arch.lpage_info[i - 1] = NULL;
 	}
@@ -10894,12 +10900,9 @@ static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot,
 	return 0;
 
 out_free:
-	for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
-		kvfree(slot->arch.rmap[i]);
-		slot->arch.rmap[i] = NULL;
-		if (i == 0)
-			continue;
+	free_memslot_rmap(slot);
 
+	for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
 		kvfree(slot->arch.lpage_info[i - 1]);
 		slot->arch.lpage_info[i - 1] = NULL;
 	}
-- 
2.31.1.607.g51e8a6a459-goog