linux-kernel - [PATCH 0/2] KVM: x86/mmu: Clean up hugepage split error handling

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Message-ID: <20240712151335.1242633-1-seanjc@google.com>
Date: Fri, 12 Jul 2024 08:13:33 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	David Matlack <dmatlack@...gle.com>
Subject: [PATCH 0/2] KVM: x86/mmu: Clean up hugepage split error handling

"Fix" an impossible scenario where KVM would install a '0' SPTE instead of
using SHADOW_NONPRESENT_VALUE.  In quotes because (a) there's not truly anything
to fix (the code should never be hit), and (b) bugging the VM doesn't guarantee
KVM won't get confused (though it's still better than installing an empty SPTE).

The main motivation for this is to eliminate installing a '0' SPTE so that
future audits of the MMU don't complain about not using SHADOW_NONPRESENT_VALUE.

Sean Christopherson (2):
  KVM: x86/mmu: Bug the VM if KVM tries to split a !hugepage SPTE
  KVM: x86/mmu: Clean up make_huge_page_split_spte() definition and
    intro

 arch/x86/kvm/mmu/spte.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

base-commit: 771df9ffadb8204e61d3e98f36c5067102aab78f
-- 
2.45.2.993.g49e7a77208-goog