KVM: x86/mmu: Apply retry protection to "fast nTDP unprotect" path

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Move the anti-infinite-loop protection provided by last_retry_{eip,addr}
into kvm_mmu_write_protect_fault() so that it guards unprotect+retry that
never hits the emulator, as well as reexecute_instruction(), which is the
last ditch "might as well try it" logic that kicks in when emulation fails
on an instruction that faulted on a write-protected gfn.

Add a new helper, kvm_mmu_unprotect_gfn_and_retry(), to set the retry
fields and deduplicate other code (with more to come).

Link: https://lore.kernel.org/r/20240831001538.336683-9-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Sean Christopherson 2024-08-30 17:15:23 -07:00

parent 9c19129e53

commit 01dd4d3192

3 changed files with 40 additions and 27 deletions

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1

arch/x86/include/asm/kvm_host.h

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39

arch/x86/kvm/mmu/mmu.c

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27

arch/x86/kvm/x86.c

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