Bug #14010
closed
bhyve should handle SMI exit on AMD
100%
Description
A bhyve user on SmartOS reported issues with guests randomly crashing. The output collected from the bhyve process sheds some light on the issue:
vm exit[0]
reason SVM
rip 0x00000000fffeed5e
inst_length 0
exitcode 0x62
exitinfo1 0x1
exitinfo2 0
That SVM exitcode corresponds to VMEXIT_SMI - physical SMI (the EXITINFO1 field provides more information)
Looking at the relevant parts in 15.13.3, we can conclude that bit0 in exitinfo1 indicates the SMI was asserted externally. Apparently bhyve lacks appropriate handling for this, which is causing the "fatal" EXITCODE_SVM result. Since the host CPU will deal with the SMI once outside guest context, little is required of us, other than not emitting an error when this occurs.
Updated by Patrick Mooney over 1 year ago
Looking through the VMCB exitcodes, the INIT intercept should also get the same no-op treatment as NMI/SMI.
Updated by Patrick Mooney over 1 year ago
I do not have access to a system which was suffering from this pathology. I booted updated bits to verify that they didn't unexpectedly regress normal behavior. The typical battery of guests booted and ran fine.
Updated by Electric Monk over 1 year ago
- Status changed from In Progress to Closed
- % Done changed from 0 to 100
git commit 8269d05caf6d455524ef86e197343d756db5e90e
commit 8269d05caf6d455524ef86e197343d756db5e90e
Author: Patrick Mooney <pmooney@pfmooney.com>
Date: 2021-09-10T18:51:31.000Z
14010 bhyve should handle SMI exit on AMD
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Robert Mustacchi <rm@fingolfin.org>
Approved by: Dan McDonald <danmcd@joyent.com>