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From: Ben Gardon <bgardon@google.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>, Peter Xu <peterx@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Peter Shier <pshier@google.com>,
	Junaid Shahid <junaids@google.com>,
	Jim Mattson <jmattson@google.com>,
	Yulei Zhang <yulei.kernel@gmail.com>,
	Wanpeng Li <kernellwp@gmail.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Xiao Guangrong <xiaoguangrong.eric@gmail.com>,
	Ben Gardon <bgardon@google.com>
Subject: [PATCH v2 4/7] KVM: x86/mmu: Factor out allocating memslot rmap
Date: Thu, 29 Apr 2021 14:18:30 -0700	[thread overview]
Message-ID: <20210429211833.3361994-5-bgardon@google.com> (raw)
In-Reply-To: <20210429211833.3361994-1-bgardon@google.com>

Small refactor to facilitate allocating rmaps for all memslots at once.

No functional change expected.

Signed-off-by: Ben Gardon <bgardon@google.com>
---
 arch/x86/kvm/x86.c | 41 ++++++++++++++++++++++++++++++++---------
 1 file changed, 32 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5bcf07465c47..fc32a7dbe4c4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10842,10 +10842,37 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
 	kvm_page_track_free_memslot(slot);
 }
 
+static int alloc_memslot_rmap(struct kvm_memory_slot *slot,
+			      unsigned long npages)
+{
+	int i;
+
+	for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
+		int lpages;
+		int level = i + 1;
+
+		lpages = gfn_to_index(slot->base_gfn + npages - 1,
+				      slot->base_gfn, level) + 1;
+
+		slot->arch.rmap[i] =
+			kvcalloc(lpages, sizeof(*slot->arch.rmap[i]),
+				 GFP_KERNEL_ACCOUNT);
+		if (!slot->arch.rmap[i])
+			goto out_free;
+	}
+
+	return 0;
+
+out_free:
+	free_memslot_rmap(slot);
+	return -ENOMEM;
+}
+
 static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot,
 				      unsigned long npages)
 {
 	int i;
+	int r;
 
 	/*
 	 * Clear out the previous array pointers for the KVM_MR_MOVE case.  The
@@ -10854,7 +10881,11 @@ static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot,
 	 */
 	memset(&slot->arch, 0, sizeof(slot->arch));
 
-	for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
+	r = alloc_memslot_rmap(slot, npages);
+	if (r)
+		return r;
+
+	for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
 		struct kvm_lpage_info *linfo;
 		unsigned long ugfn;
 		int lpages;
@@ -10863,14 +10894,6 @@ static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot,
 		lpages = gfn_to_index(slot->base_gfn + npages - 1,
 				      slot->base_gfn, level) + 1;
 
-		slot->arch.rmap[i] =
-			kvcalloc(lpages, sizeof(*slot->arch.rmap[i]),
-				 GFP_KERNEL_ACCOUNT);
-		if (!slot->arch.rmap[i])
-			goto out_free;
-		if (i == 0)
-			continue;
-
 		linfo = kvcalloc(lpages, sizeof(*linfo), GFP_KERNEL_ACCOUNT);
 		if (!linfo)
 			goto out_free;
-- 
2.31.1.527.g47e6f16901-goog


  parent reply	other threads:[~2021-04-29 21:19 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-29 21:18 [PATCH v2 0/7] Lazily allocate memslot rmaps Ben Gardon
2021-04-29 21:18 ` [PATCH v2 1/7] KVM: x86/mmu: Track if shadow MMU active Ben Gardon
2021-05-03 13:42   ` Paolo Bonzini
2021-05-04 17:26     ` Ben Gardon
2021-05-04 20:18       ` Paolo Bonzini
2021-05-04 19:55   ` Sean Christopherson
2021-05-04 20:26     ` Paolo Bonzini
2021-05-04 20:36       ` Sean Christopherson
2021-04-29 21:18 ` [PATCH v2 2/7] KVM: x86/mmu: Skip rmap operations if shadow MMU inactive Ben Gardon
2021-04-29 21:18 ` [PATCH v2 3/7] KVM: x86/mmu: Deduplicate rmap freeing Ben Gardon
2021-04-29 21:18 ` Ben Gardon [this message]
2021-04-29 21:18 ` [PATCH v2 5/7] KVM: mmu: Refactor memslot copy Ben Gardon
2021-04-29 21:18 ` [PATCH v2 6/7] KVM: mmu: Add slots_arch_lock for memslot arch fields Ben Gardon
2021-05-03 13:29   ` Paolo Bonzini
2021-04-29 21:18 ` [PATCH v2 7/7] KVM: x86/mmu: Lazily allocate memslot rmaps Ben Gardon
2021-05-03 13:42   ` Paolo Bonzini
2021-05-03 17:29     ` Ben Gardon
2021-05-04 20:13   ` Sean Christopherson
2021-05-04 20:19     ` Paolo Bonzini
2021-05-04 20:34       ` Sean Christopherson
2021-05-04 20:22   ` Paolo Bonzini
2021-05-03 13:44 ` [PATCH v2 0/7] " Paolo Bonzini
2021-05-03 17:31   ` Ben Gardon
2021-05-04  7:21     ` Paolo Bonzini
2021-05-04 17:28       ` Ben Gardon
2021-05-04 18:17         ` Sean Christopherson

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