diff options
| author | Sean Christopherson | 2020-07-02 19:35:34 -0700 |
|---|---|---|
| committer | Paolo Bonzini | 2020-07-09 13:29:40 -0400 |
| commit | 5f6078f9f1e32b395a78c8d0c0f6598004c668de (patch) | |
| tree | a16b5598580494a8755299dacfc60d316044fab0 /arch | |
| parent | 171a90d70f25c2501162aef5f42eba5fc91c054a (diff) | |
KVM: x86/mmu: Make __GFP_ZERO a property of the memory cache
Add a gfp_zero flag to 'struct kvm_mmu_memory_cache' and use it to
control __GFP_ZERO instead of hardcoding a call to kmem_cache_zalloc().
A future patch needs such a flag for the __get_free_page() path, as
gfn arrays do not need/want the allocator to zero the memory. Convert
the kmem_cache paths to __GFP_ZERO now so as to avoid a weird and
inconsistent API in the future.
No functional change intended.
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200703023545.8771-11-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 1 | ||||
| -rw-r--r-- | arch/x86/kvm/mmu/mmu.c | 7 |
2 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 01f5c1508851..9d41eb5a8453 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -251,6 +251,7 @@ struct kvm_kernel_irq_routing_entry; */ struct kvm_mmu_memory_cache { int nobjs; + gfp_t gfp_zero; struct kmem_cache *kmem_cache; void *objects[KVM_NR_MEM_OBJS]; }; diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index a8fc17ac7ed0..6e57044ae848 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -1064,8 +1064,10 @@ static void walk_shadow_page_lockless_end(struct kvm_vcpu *vcpu) static inline void *mmu_memory_cache_alloc_obj(struct kvm_mmu_memory_cache *mc, gfp_t gfp_flags) { + gfp_flags |= mc->gfp_zero; + if (mc->kmem_cache) - return kmem_cache_zalloc(mc->kmem_cache, gfp_flags); + return kmem_cache_alloc(mc->kmem_cache, gfp_flags); else return (void *)__get_free_page(gfp_flags); } @@ -5701,7 +5703,10 @@ int kvm_mmu_create(struct kvm_vcpu *vcpu) int ret; vcpu->arch.mmu_pte_list_desc_cache.kmem_cache = pte_list_desc_cache; + vcpu->arch.mmu_pte_list_desc_cache.gfp_zero = __GFP_ZERO; + vcpu->arch.mmu_page_header_cache.kmem_cache = mmu_page_header_cache; + vcpu->arch.mmu_page_header_cache.gfp_zero = __GFP_ZERO; vcpu->arch.mmu = &vcpu->arch.root_mmu; vcpu->arch.walk_mmu = &vcpu->arch.root_mmu; |