[Bug 215964] nVMX: KVM(L0) does not perform a platform reboot when guest(L2) trigger a reboot event through IO-Port-0xCF9

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215964

Sean Christopherson (seanjc@google.com) changed:

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                 CC|                            |seanjc@google.com

--- Comment #1 from Sean Christopherson (seanjc@google.com) ---
Hmm, so KVM doesn't perform the RESET, that's handled by userspace.  KVM's
responsibility is purely to determine whether the OUT 0xCF9 should be forwarded
to L1 or bounced out to userspace.

Does the 0xCF9 I/O access get sent to userspace?  If not, can you provide L1's
VMCS configuration for L2?  Specifically, the settings for USE_IO_BITMAPS and
the relevant bitmap bits if in use, or UNCOND_IO_EXITING if not using bitmaps.

If the I/O access does show up in userspace, then it's likely a userspace bug,
e.g. userspace fails to clear nested state when emulating RESET.

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