kvm: x86/mmu: Support write protection for nesting in tdp MMU

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To support nested virtualization, KVM will sometimes need to write
protect pages which are part of a shadowed paging structure or are not
writable in the shadowed paging structure. Add a function to write
protect GFN mappings for this purpose.

Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell
machine. This series introduced no new failures.

This series can be viewed in Gerrit at:
	https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538

Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20201014182700.2888246-18-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Ben Gardon 2020-10-14 11:26:57 -07:00 • committed by Paolo Bonzini

parent 1488199856

commit 46044f72c3

3 changed files with 57 additions and 0 deletions

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4

arch/x86/kvm/mmu/mmu.c

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50

arch/x86/kvm/mmu/tdp_mmu.c

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3

arch/x86/kvm/mmu/tdp_mmu.h

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