Date:   Mon,  6 Mar 2023 14:41:23 -0800
In-Reply-To: <20230306224127.1689967-1-vipinsh@google.com>
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References: <20230306224127.1689967-1-vipinsh@google.com>
Message-ID: <20230306224127.1689967-15-vipinsh@google.com>
Subject: [Patch v4 14/18] KVM: mmu: Initialize kvm_mmu_memory_cache.gfp_zero
 to __GFP_ZERO by default
From:   Vipin Sharma <vipinsh@google.com>
To:     seanjc@google.com, pbonzini@redhat.com, bgardon@google.com,
        dmatlack@google.com
Cc:     jmattson@google.com, mizhang@google.com, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org, Vipin Sharma <vipinsh@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Set __GFP_ZERO to gfp_zero in default initizliation of struct
kvm_mmu_memory_cache{}

All of the users of default initialization code of struct
kvm_mmu_memory_cache{} explicitly sets gfp_zero to __GFP_ZERO. This can
be moved to common initialization logic.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
---
 arch/arm64/kvm/arm.c      | 1 -
 arch/arm64/kvm/mmu.c      | 1 -
 arch/riscv/kvm/mmu.c      | 1 -
 arch/riscv/kvm/vcpu.c     | 1 -
 arch/x86/kvm/mmu/mmu.c    | 6 ------
 include/linux/kvm_types.h | 4 +++-
 6 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 2b3d88e4ace8..b4243978d962 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -331,7 +331,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
 
 	INIT_KVM_MMU_MEMORY_CACHE(&vcpu->arch.mmu_page_cache);
-	vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
 
 	/*
 	 * Default value for the FP state, will be overloaded at load
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 8a56f071ca66..133eba96c41f 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -904,7 +904,6 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
 	if (is_protected_kvm_enabled())
 		return -EPERM;
 
-	cache.gfp_zero = __GFP_ZERO;
 	size += offset_in_page(guest_ipa);
 	guest_ipa &= PAGE_MASK;
 
diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index bdd8c17958dd..62550fd91c70 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -353,7 +353,6 @@ int kvm_riscv_gstage_ioremap(struct kvm *kvm, gpa_t gpa,
 	phys_addr_t addr, end;
 	KVM_MMU_MEMORY_CACHE(pcache);
 
-	pcache.gfp_zero = __GFP_ZERO;
 	if (in_atomic)
 		pcache.gfp_custom = GFP_ATOMIC | __GFP_ACCOUNT;
 
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index bc743e9122d1..f5a96ed1e426 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -164,7 +164,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	/* Mark this VCPU never ran */
 	vcpu->arch.ran_atleast_once = false;
 	INIT_KVM_MMU_MEMORY_CACHE(&vcpu->arch.mmu_page_cache);
-	vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
 	bitmap_zero(vcpu->arch.isa, RISCV_ISA_EXT_MAX);
 
 	/* Setup ISA features available to VCPU */
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index b706087ef74e..d96afc849ee8 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5963,14 +5963,11 @@ int kvm_mmu_create(struct kvm_vcpu *vcpu)
 
 	INIT_KVM_MMU_MEMORY_CACHE(&vcpu->arch.mmu_pte_list_desc_cache);
 	vcpu->arch.mmu_pte_list_desc_cache.kmem_cache = pte_list_desc_cache;
-	vcpu->arch.mmu_pte_list_desc_cache.gfp_zero = __GFP_ZERO;
 
 	INIT_KVM_MMU_MEMORY_CACHE(&vcpu->arch.mmu_page_header_cache);
 	vcpu->arch.mmu_page_header_cache.kmem_cache = mmu_page_header_cache;
-	vcpu->arch.mmu_page_header_cache.gfp_zero = __GFP_ZERO;
 
 	INIT_KVM_MMU_MEMORY_CACHE(&vcpu->arch.mmu_shadow_page_cache);
-	vcpu->arch.mmu_shadow_page_cache.gfp_zero = __GFP_ZERO;
 	mutex_init(&vcpu->arch.mmu_shadow_page_cache_lock);
 
 	INIT_KVM_MMU_MEMORY_CACHE(&vcpu->arch.mmu_shadowed_info_cache);
@@ -6138,14 +6135,11 @@ int kvm_mmu_init_vm(struct kvm *kvm)
 
 	INIT_KVM_MMU_MEMORY_CACHE(&kvm->arch.split_page_header_cache);
 	kvm->arch.split_page_header_cache.kmem_cache = mmu_page_header_cache;
-	kvm->arch.split_page_header_cache.gfp_zero = __GFP_ZERO;
 
 	INIT_KVM_MMU_MEMORY_CACHE(&kvm->arch.split_shadow_page_cache);
-	kvm->arch.split_shadow_page_cache.gfp_zero = __GFP_ZERO;
 
 	INIT_KVM_MMU_MEMORY_CACHE(&kvm->arch.split_desc_cache);
 	kvm->arch.split_desc_cache.kmem_cache = pte_list_desc_cache;
-	kvm->arch.split_desc_cache.gfp_zero = __GFP_ZERO;
 
 	return 0;
 }
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index 192516eeccac..5da7953532ce 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h
@@ -99,7 +99,9 @@ struct kvm_mmu_memory_cache {
 	void **objects;
 };
 
-#define KVM_MMU_MEMORY_CACHE_INIT() { }
+#define KVM_MMU_MEMORY_CACHE_INIT() {	\
+	.gfp_zero = __GFP_ZERO,		\
+}
 
 #define KVM_MMU_MEMORY_CACHE(_name) \
 		struct kvm_mmu_memory_cache _name = KVM_MMU_MEMORY_CACHE_INIT()
-- 
2.40.0.rc0.216.gc4246ad0f0-goog