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KVM: x86/mmu: Make __GFP_ZERO a property of the memory cache

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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>
This commit is contained in:
Sean Christopherson 2020-07-02 19:35:34 -07:00 committed by Paolo Bonzini
parent 171a90d70f
commit 5f6078f9f1
2 changed files with 7 additions and 1 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -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];
};

7
arch/x86/kvm/mmu/mmu.c
View File

@ -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;