[PATCH 0/3] KVM: x86/mmu: Cleanups for eager page splitting

From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	David Matlack <dmatlack@google.com>
Subject: [PATCH 0/3] KVM: x86/mmu: Cleanups for eager page splitting
Date: Fri, 24 Jun 2022 17:18:05 +0000	[thread overview]
Message-ID: <20220624171808.2845941-1-seanjc@google.com> (raw)

Eager page splitting cleanups for a few minor things that were noted in
code review but didn't make it into the committed code.

The last patch in particular is a bit more urgent than I first realized.
I had forgotten that pte_list_desc is now 128 bytes, and I also had a
brain fart and thought it was just allocating pointers, i.e. 8 bytes.
In other words, I was thinking the 513 object buffer was "only" wasting
~8kb per VM, whereas it actually costs ~64kb per VM.

Sean Christopherson (3):
  KVM: x86/mmu: Avoid subtle pointer arithmetic in kvm_mmu_child_role()
  KVM: x86/mmu: Use "unsigned int", not "u32", for SPTEs' @access info
  KVM: x86/mmu: Buffer nested MMU split_desc_cache only by default
    capacity

 arch/x86/kvm/mmu/mmu.c | 53 ++++++++++++++++++++++++++++--------------
 1 file changed, 35 insertions(+), 18 deletions(-)

base-commit: 4b88b1a518b337de1252b8180519ca4c00015c9e
-- 
2.37.0.rc0.161.g10f37bed90-goog