Hi,
I have a nested SVM setup with a 4.15 L0, 4.14.20 L1/L2 (L0 hardware is
a Threadripper). After upgrading L0 to 4.16, L2 guests ceased to boot
(no video output from BIOS, it seems to hang early in an endless vmexit
loop). 4.17 still contains the regression.
I bisected it to:
commit 7607b7174405aec7441ff6c970833c463114040a
Author: Brijesh Singh <brijesh.singh@xxxxxxx>
Date: Mon Feb 19 10:14:44 2018 -0600
KVM: SVM: install RSM intercept
Perhaps the L2 BIOS uses SMM/rsm and this is interacting poorly with an
L1 that does not contain this patch? I'm not familiar with the KVM code;
any suggestions/pointers welcome.
(I'm not subscribed to the kvm list, please cc:)
--
Hector Martin "marcan" (marcan@xxxxxxxxx)
Public Key: https://mrcn.st/pub
