bhyve should handle SMI exit on AMD
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 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 Electric Monk 3 months ago
- Status changed from In Progress to Closed
- % Done changed from 0 to 100
commit 8269d05caf6d455524ef86e197343d756db5e90e Author: Patrick Mooney <email@example.com> Date: 2021-09-10T18:51:31.000Z 14010 bhyve should handle SMI exit on AMD Reviewed by: Toomas Soome <firstname.lastname@example.org> Reviewed by: Robert Mustacchi <email@example.com> Approved by: Dan McDonald <firstname.lastname@example.org>