KVM: x86/mmu: Lazily allocate memslot rmaps

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If the TDP MMU is in use, wait to allocate the rmaps until the shadow
MMU is actually used. (i.e. a nested VM is launched.) This saves memory
equal to 0.2% of guest memory in cases where the TDP MMU is used and
there are no nested guests involved.

Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210518173414.450044-8-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Ben Gardon 2021-05-18 10:34:14 -07:00 • committed by Paolo Bonzini

parent e2209710cc

commit d501f747ef

6 changed files with 71 additions and 8 deletions

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2

arch/x86/include/asm/kvm_host.h

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arch/x86/kvm/mmu.h

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arch/x86/kvm/mmu/mmu.c

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arch/x86/kvm/mmu/tdp_mmu.c

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arch/x86/kvm/mmu/tdp_mmu.h

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arch/x86/kvm/x86.c

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