On Tue, Dec 17, 2024, Ivan Orlov wrote:
> Move unhandleable vmexit during vectoring error detection
> into check_emulate_instruction. Implement the function which prohibits
> the emulation if EMULTYPE_PF is set when vectoring, otherwise such a
> situation may occur:
I definitely think it's worth explaining that moving the detection covers new
emulation cases, and also calling out that handle_ept_misconfig() consults
vmx_check_emulate_instruction(), i.e. that moving the detection shouldn't
affect KVM's overall handlng of EPT Misconfig.
--
Move handling of emulation during event vectoring, which KVM doesn't
support, into VMX's check_emulate_instruction(), so that KVM detects
all unsupported emulation, not just cached emulated MMIO (EPT misconfig).
E.g. on emulated MMIO that isn't cached (EPT Violation) or occurs with
legacy shadow paging (#PF).
Rejecting emulation on other sources of emulation also fixes a largely
theoretical flaw (thanks to the "unprotect and retry" logic), where KVM
could incorrectly inject a #DF:
1. CPU executes an instruction and hits a #GP
2. While vectoring the #GP, a shadow #PF occurs
3. On the #PF VM-Exit, KVM re-injects #GP
4. KVM emulates because of the write-protected page
5. KVM "successfully" emulates and also detects the #GP
6. KVM synthesizes a #GP, and since #GP has already been injected,
incorrectly escalates to a #DF.
Fix the comment about EMULTYPE_PF as this flag doesn't necessarily
mean MMIO anymore: it can also be set due to the write protection
violation.
Note, handle_ept_misconfig() checks vmx_check_emulate_instruction() before
attempting emulation of any kind.
