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

[Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>]

On 09/21/2015 11:30 AM, Wanpeng Li wrote:
> 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 I use
> > > > > OVMF - 100% cpu usage, VM resetting, while it works properly on kernel 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 under the
> > > > 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 can boot
> > 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=0000000000000000 DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=af af af af af af af af af af af af af af af af af af af af <00> 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 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=0000000000000000 DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=af af af af af af af af af af af af af af af af af af af af <00> 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000600
> ESI=00000000 EDI=00002000 EBP=00000000 ESP=00000000
> EIP=00001000 EFL=00010046 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
> ES =0000 00000000 0000ffff 00009300
> CS =9f00 0009f000 0000ffff 00009b00
> SS =0000 00000000 0000ffff 00009300
> DS =0000 00000000 0000ffff 00009300
> FS =0000 00000000 0000ffff 00009300
> GS =0000 00000000 0000ffff 00009300
> LDT=0000 00000000 0000ffff 00008200
> TR =0000 00000000 0000ffff 00008b00
> GDT=     00000000 0000ffff
> IDT=     00000000 0000ffff
> CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000
> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=af af af af af af af af af af af af af af af af af af af af <00> 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> EAX=00000023 EBX=00000002 ECX=00000000 EDX=00000600
> ESI=00000000 EDI=00001fc2 EBP=00000000 ESP=00000000
> EIP=00001000 EFL=00010002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
> ES =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> CS =9f00 0009f000 0000ffff 00009b00 DPL=0 CS16 [-RA]
> SS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> DS =9f00 0009f000 0000ffff 00009300 DPL=0 DS16 [-WA]
> FS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> GS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-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=00000000 CR4=00000000
> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=af af af af af af af af af af af af af af af af af af af af <00> 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> EAX=00000023 EBX=00000002 ECX=00000000 EDX=00000600
> ESI=00000000 EDI=00001fc2 EBP=00000000 ESP=00000000
> EIP=00001000 EFL=00010002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
> ES =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> CS =9f00 0009f000 0000ffff 00009b00 DPL=0 CS16 [-RA]
> SS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> DS =9f00 0009f000 0000ffff 00009300 DPL=0 DS16 [-WA]
> FS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> GS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-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=00000000 CR4=00000000
> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=af af af af af af af af af af af af af af af af af af af af <00> 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> EAX=00000023 EBX=00000002 ECX=00000000 EDX=00000600
> ESI=00000000 EDI=00001fc2 EBP=00000000 ESP=00000000
> EIP=00001000 EFL=00010002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
> ES =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> CS =9f00 0009f000 0000ffff 00009b00 DPL=0 CS16 [-RA]
> SS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> DS =9f00 0009f000 0000ffff 00009300 DPL=0 DS16 [-WA]
> FS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> GS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-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=00000000 CR4=00000000
> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=af af af af af af af af af af af af af af af af af af af af <00> 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 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=0000000000000000 DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=af af af af af af af af af af af af af af af af af af af af <00> 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00


Got it, thank you!
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