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[v2,0/3] KVM: x86: Dynamically allocate hashed page list

Message ID 20250401155714.838398-1-seanjc@google.com (mailing list archive)
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Series KVM: x86: Dynamically allocate hashed page list | expand

Message

Sean Christopherson April 1, 2025, 3:57 p.m. UTC 
Allocate the hashed list of shadow pages dynamically (separate from
struct kvm), and on-demand.  The hashed list is 32KiB, i.e. absolutely
belongs in a separate allocation, and is worth skipping if KVM isn't
shadowing guest PTEs for the VM.

v2:
 - Actually defer allocation when using TDP MMU. [Vipin]
 - Free allocation on MMU teardown. [Vipin]

v1: https://lore.kernel.org/all/20250315024010.2360884-1-seanjc@google.com

Sean Christopherson (3):
  KVM: x86/mmu: Dynamically allocate shadow MMU's hashed page list
  KVM: x86: Allocate kvm_vmx/kvm_svm structures using kzalloc()
  KVM: x86/mmu: Defer allocation of shadow MMU's hashed page list

 arch/x86/include/asm/kvm_host.h |  6 ++--
 arch/x86/kvm/mmu/mmu.c          | 53 +++++++++++++++++++++++++++++----
 arch/x86/kvm/svm/svm.c          |  1 +
 arch/x86/kvm/vmx/vmx.c          |  1 +
 arch/x86/kvm/x86.c              |  5 +++-
 5 files changed, 56 insertions(+), 10 deletions(-)


base-commit: 782f9feaa9517caf33186dcdd6b50a8f770ed29b