Re: KVM guests freeze under upstream kernel
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2017-07-19 23:43:11
On Wed, 2017-07-19 at 16:46 -0300, joserz@linux.vnet.ibm.com wrote:
Hello! We're not able to boot any KVM guest using upstream kernel (cb8c65ccff7f77d0285f1b126c72d37b2572c865 - 4.13.0-rc1+). After reaching the SLOF initial counting, the guest simply freezes:
Can you send our .config ?
SLOF ********************************************************************** QEMU Starting Build Date = Mar 3 2017 13:29:19 FW Version = git-66d250ef0fd06bb8 Press "s" to enter Open Firmware. C0360 After bisecting I found the commit: https://github.com/torvalds/linux/commit/ebd3119 powerpc/mm: Add devmap support for ppc64 Add support for the devmap bit on PTEs and PMDs for PPC64 Book3S. This is used to differentiate device backed memory from transparent huge pages since they are handled in more or less the same manner by the core mm code. Reverting the commit and rebuilding 4.13.0-rc1+ was enough to make a workaround. But I'll need some help from you guys in order to solve it. Thanks! Jose Ziviani