linux-kernel - [Patch v4 15/18] KVM: mmu: Add NUMA node support in struct kvm_mmu_memory

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Date:   Mon,  6 Mar 2023 14:41:24 -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 15/18] KVM: mmu: Add NUMA node support in struct kvm_mmu_memory_cache{}

Add NUMA node id variable in struct kvm_mmu_memory_cache{}. This
variable denotes preferable NUMA node from which memory will be
allocated under this memory cache.

Set this variable to NUMA_NO_NODE if there is no preferred node.

MIPS doesn't do any sort of initializatino of struct
kvm_mmu_memory_cache{}. Keep things similar in MIPS by setting gfp_zero
to 0 as INIT_KVM_MMU_MEMORY_CACHE() will initialize it to __GFP_ZERO.

"node" cannot be left as 0, as 0 is a valid NUMA node value.

Signed-off-by: Vipin Sharma <vipinsh@...gle.com>
---
 arch/mips/kvm/mips.c      | 3 +++
 include/linux/kvm_types.h | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 36c8991b5d39..5ec5ce919918 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -294,6 +294,9 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 		     HRTIMER_MODE_REL);
 	vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
 
+	INIT_KVM_MMU_MEMORY_CACHE(&vcpu->arch.mmu_page_cache);
+	vcpu->arch.mmu_page_cache.gfp_zero = 0;
+
 	/*
 	 * Allocate space for host mode exception handlers that handle
 	 * guest mode exits
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index 5da7953532ce..b2a405c8e629 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h
@@ -97,10 +97,13 @@ struct kvm_mmu_memory_cache {
 	struct kmem_cache *kmem_cache;
 	int capacity;
 	void **objects;
+	/* Preferred NUMA node of memory allocation. */
+	int node;
 };
 
 #define KVM_MMU_MEMORY_CACHE_INIT() {	\
 	.gfp_zero = __GFP_ZERO,		\
+	.node = NUMA_NO_NODE,		\
 }
 
 #define KVM_MMU_MEMORY_CACHE(_name) \
-- 
2.40.0.rc0.216.gc4246ad0f0-goog