KVM: x86/mmu: check for invalid async page faults involving private memory

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Right now the error code is not used when an async page fault is completed.
This is not a problem in the current code, but it is untidy.  For protected
VMs, we will also need to check that the page attributes match the current
state of the page, because asynchronous page faults can only occur on
shared pages (private pages go through kvm_faultin_pfn_private() instead of
__gfn_to_pfn_memslot()).

Start by piping the error code from kvm_arch_setup_async_pf() to
kvm_arch_async_page_ready() via the architecture-specific async page
fault data.  For now, it can be used to assert that there are no
async page faults on private memory.

Extracted from a patch by Isaku Yamahata.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Paolo Bonzini 2024-02-27 09:11:28 -05:00

parent b3d5dc629c

commit cd389f5070

2 changed files with 12 additions and 7 deletions

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1

arch/x86/include/asm/kvm_host.h

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18

arch/x86/kvm/mmu/mmu.c

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