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KVM: Add gfp_custom flag in struct kvm_mmu_memory_cache

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The kvm_mmu_topup_memory_cache() always uses GFP_KERNEL_ACCOUNT for
memory allocation which prevents it's use in atomic context. To address
this limitation of kvm_mmu_topup_memory_cache(), we add gfp_custom flag
in struct kvm_mmu_memory_cache. When the gfp_custom flag is set to some
GFP_xyz flags, the kvm_mmu_topup_memory_cache() will use that instead of
GFP_KERNEL_ACCOUNT.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel 2022-07-29 17:15:00 +05:30 • committed by Anup Patel
parent 8a061562e2
commit 4ab0e470c0
2 changed files with 4 additions and 1 deletions
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1
include/linux/kvm_types.h
View file

@ -87,6 +87,7 @@ struct gfn_to_pfn_cache {
struct kvm_mmu_memory_cache {
int nobjs;
gfp_t gfp_zero;
gfp_t gfp_custom;
struct kmem_cache *kmem_cache;
void *objects[KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE];
};

4
virt/kvm/kvm_main.c
View file

@ -386,7 +386,9 @@ int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min)
if (mc->nobjs >= min)
return 0;
while (mc->nobjs < ARRAY_SIZE(mc->objects)) {
obj = mmu_memory_cache_alloc_obj(mc, GFP_KERNEL_ACCOUNT);
obj = mmu_memory_cache_alloc_obj(mc, (mc->gfp_custom) ?
mc->gfp_custom :
GFP_KERNEL_ACCOUNT);
if (!obj)
return mc->nobjs >= min ? 0 : -ENOMEM;
mc->objects[mc->nobjs++] = obj;