Re: [edk2] KVM: MTRR: fix memory type handling if MTRR is completely disabled

Wanpeng Li Sun, 20 Sep 2015 20:31:19 -0700

On 9/21/15 10:51 AM, Xiao Guangrong wrote:


Thanks for your report and analysis, Janusz!

On 09/19/2015 01:48 AM, Janusz wrote:

W dniu 18.09.2015 o 12:07, Laszlo Ersek pisze:

On 09/18/15 11:37, Janusz wrote:

Hello,

I am writting about this patch that was posted by Xiao:
http://www.spinics.net/lists/kvm/msg119044.html and this:
http://www.spinics.net/lists/kvm/msg119045.html
I've tested both kernel 4.2 and 4.3 and problem still exists when IuseOVMF - 100% cpu usage, VM resetting, while it works properly onkernel 4.1

My last (still current) request remains "please quirk it". See the end
of <http://thread.gmane.org/gmane.linux.kernel/1952205/focus=1996025>,
and other messages in that subthread.

when I saw message from Xiao that he posted patch for it and have seen
this code in kernel sources (landed in 4.2-rc3) I though that the status
is not "please quirk it" anymore


I haven't been following kernel development, so maybe the quirk has not
happened. No clue.

... "VM resetting" looks something different though; I've been underthe

impression that the pedantic (=unquirked) MTRR configuration didn't
impact other things than speed. Janusz, maybe you could contribute with
a host kernel bisection for the VM reset symptom.

To be more exact - VM is mostly not starting or its starting after long
time and then resetting it self at random time (but before system boots)
or gets very high cpu usage or sometimes boots without problem (the
least possible case scenario). When I start VM with -vga std, not with
my gpu passthrough - in most of the time I get this:
http://pastebin.com/raw.php?i=CKrNsueS

It seems the behaviour is different with previous (previously, it canboot

but slowly), right?

The URL cat not be accessed, i do not know it's your web server issue or
our networking issue.


It can be accessed and dump as below:

KVM internal error. Suberror: 1
emulation failure
KVM internal error. Suberror: 1
emulation failure
KVM internal error. Suberror: 1
emulation failure
KVM internal error. Suberror: 1
emulation failure
KVM internal error. Suberror: 1
emulation failure
KVM internal error. Suberror: 1
emulation failure
KVM internal error. Suberror: 1
emulation failure
EAX=bfefa000 EBX=00000002 ECX=00000000 EDX=00000600
ESI=00000000 EDI=00003eb8 EBP=00000000 ESP=00000000
EIP=000a0000 EFL=00010086 [--S--P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0008 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0010 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0008 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0008 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0008 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0008 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     bfee87d8 0000003f
IDT=     00000000 0000ffff
CR0=00000033 CR2=00000000 CR3=bfefa000 CR4=00000640

DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000DR3=0000000000000000

DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000