linux-kernel - [Patch v4 05/18] KVM: x86/mmu: Add split_shadow_page_cache pages to global count of MMU cache pages

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Date:   Mon,  6 Mar 2023 14:41:14 -0800
From:   Vipin Sharma <vipinsh@...gle.com>
To:     seanjc@...gle.com, pbonzini@...hat.com, bgardon@...gle.com,
        dmatlack@...gle.com
Cc:     jmattson@...gle.com, mizhang@...gle.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Vipin Sharma <vipinsh@...gle.com>
Subject: [Patch v4 05/18] KVM: x86/mmu: Add split_shadow_page_cache pages to
 global count of MMU cache pages

Add pages in split_shadow_page_cache to the global counter
kvm_total_unused_cached_pages. These pages will be freed by MMU shrinker
in future commit.

Signed-off-by: Vipin Sharma <vipinsh@...gle.com>
---
 arch/x86/kvm/mmu/mmu.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index df8dcb7e5de7..0ebb8a2eaf47 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6149,7 +6149,9 @@ static void mmu_free_vm_memory_caches(struct kvm *kvm)
 {
 	kvm_mmu_free_memory_cache(&kvm->arch.split_desc_cache);
 	kvm_mmu_free_memory_cache(&kvm->arch.split_page_header_cache);
-	kvm_mmu_free_memory_cache(&kvm->arch.split_shadow_page_cache);
+	mutex_lock(&kvm->slots_lock);
+	mmu_free_sp_memory_cache(&kvm->arch.split_shadow_page_cache);
+	mutex_unlock(&kvm->slots_lock);
 }
 
 void kvm_mmu_uninit_vm(struct kvm *kvm)
@@ -6303,7 +6305,7 @@ static int topup_split_caches(struct kvm *kvm)
 	if (r)
 		return r;
 
-	return kvm_mmu_topup_memory_cache(&kvm->arch.split_shadow_page_cache, 1);
+	return mmu_topup_sp_memory_cache(&kvm->arch.split_shadow_page_cache, 1);
 }
 
 static struct kvm_mmu_page *shadow_mmu_get_sp_for_split(struct kvm *kvm, u64 *huge_sptep)
@@ -6328,6 +6330,7 @@ static struct kvm_mmu_page *shadow_mmu_get_sp_for_split(struct kvm *kvm, u64 *hu
 	/* Direct SPs do not require a shadowed_info_cache. */
 	caches.page_header_cache = &kvm->arch.split_page_header_cache;
 	caches.shadow_page_cache = &kvm->arch.split_shadow_page_cache;
+	caches.count_shadow_page_allocation = true;
 
 	/* Safe to pass NULL for vCPU since requesting a direct SP. */
 	return __kvm_mmu_get_shadow_page(kvm, NULL, &caches, gfn, role);
-- 
2.40.0.rc0.216.gc4246ad0f0-goog