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RE: [Xen-devel] about the memory paging
Do you meet this issue on Linux guest also?
Is your windows 2003 guest a PAE guest? If yes, can you check if
it is a "mov cr3" instruction? You can either add a hook in xen
hypervisor to dump the guest memory around the RIP (0x8088dc37), or connect to
the guest through windbg with paging off, and disassmble it.
I suspect it is because the page used as guest CR3 is paging
out, and for PAE guest, that will cause a EPT violation with GLA_VALID bit
cleared. And then in fact the hvm_hap_nested_page_fault() function is not
called at all.
The easist experiment is, remove the check for the GLA_VALID and
see the result.
CC Xin who knows EPT better than me.
I didn't check log 2, so no idea of the reason.
Thanks
--jyh
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of linqaingmin
Sent: Saturday, September 04, 2010 4:56 PM
To: Patrick Colp
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] about the memory paging
We run windows2003
HVM on xen4.0.1, The VM is 2048MB, 2 VCPU
run command
"xenpaging domID 260000" and want to paging 1024MB in xen.
It causes two
different crashes.
1) the first one
the xm dmesg context is follow
(XEN)
vmx.c:2150:d6 EPT violation 0x1 (r--/---), gpa 0x0000007fbba020, mfn
0xffffffffff, type 10.
(XEN) p2m-ept.c:533:d6 Walking EPT tables for domain 6 gfn 7fbba
(XEN) p2m-ept.c:552:d6 epte 435b38007
(XEN) p2m-ept.c:552:d6 epte 4395b3007
(XEN) p2m-ept.c:552:d6 epte 433f7f007
(XEN) p2m-ept.c:552:d6 epte ffffffffffa00
(XEN) domain_crash called from vmx.c:2160
(XEN) Domain 6 (vcpu#1) crashed on cpu#14:
(XEN) ----[ Xen-4.0.1 x86_64 debug=n Not tainted ]----
(XEN) CPU: 14
(XEN) RIP: 0008:[<000000008088dc37>]
(XEN) RFLAGS: 0000000000010246 CONTEXT: hvm guest
(XEN) rax: 000000007fbba020 rbx: 00000000f7727000 rcx:
0000000000000000
(XEN) rdx: 0000000080010031 rsi: 000000008996a418 rdi:
00000000f772a090
(XEN) rbp: 0000000089d88648 rsp: 00000000baf2ace0
r8: 0000000000000000
(XEN) r9: 0000000000000000 r10: 0000000000000000
r11: 0000000000000000
(XEN) r12: 0000000000000000 r13: 0000000000000000 r14:
0000000000000000
(XEN) r15: 0000000000000000 cr0: 000000008001003b cr4:
00000000000006f9
(XEN) cr3: 0000000000790000 cr2: 00000000c3cfb008
(XEN) ds: 0023 es: 0023 fs: 0030 gs:
0000 ss: 0010 cs: 0008
this is the guest
linear-address field is invalid. GLA ; 0x7fbba020
2) another crash is the qemu-dm Segmentation fault , the "s"
parameter is NULL
Program terminated
with signal 11, Segmentation fault.
#0 0x00000000004451d2 in ide_read_dma_cb (opaque=0xb79028, ret=0) at
/home/Lucifer/xen-4.0.1/tools/ioemu-dir/hw/ide.c:1232
1232 if (!s->bs) return; /* ouch!
(see ide_flush_cb) */
(gdb) bt
#0 0x00000000004451d2 in ide_read_dma_cb (opaque=0xb79028, ret=0) at
/home/Lucifer/xen-4.0.1/tools/ioemu-dir/hw/ide.c:1232
#1 0x000000000041745d in dma_bdrv_cb (opaque=0xbbb1f0, ret=0) at /home/Lucifer/xen-4.0.1/tools/ioemu-dir/dma-helpers.c:97
#2 0x00000000004172f2 in reschedule_dma (opaque=0xbbb1f0) at
/home/Lucifer/xen-4.0.1/tools/ioemu-dir/dma-helpers.c:63
#3 0x000000000040c48a in qemu_bh_poll () at
/home/Lucifer/xen-4.0.1/tools/ioemu-dir/vl.c:3427
#4 0x000000000040cfe2 in main_loop_wait (timeout=10) at
/home/Lucifer/xen-4.0.1/tools/ioemu-dir/vl.c:3831
#5 0x00000000004c2daf in main_loop () at helper2.c:577
#6 0x000000000041056e in main (argc=28, argv=0x7fff9eeee288, envp=0x7fff9eeee370)
at /home/Lucifer/xen-4.0.1/tools/ioemu-dir/vl.c:6153
(gdb)
When the Guest OS
have install PV Driver. only first crash
----- Original
Message -----
Sent: Friday, September 03, 2010 11:08 PM
Subject: Re: [Xen-devel] about the memory paging
Hi,
Sorry, I'm not quite sure what you're asking and/or if you ran into a
problem? Are you just asking how the xenpaging mechanism works?
Patrick
2010/9/2 linqaingmin <linqiangmin@xxxxxxxxxx>:
> hi all
>
> Generate ept entry violation into function of ept_handle_violation .
>
> then call function of hvm_hap_nested_page_fault,this judge page type into
> p2m_mem_paging_populate();
>
> Here the event to notify the user space "xenpaging" process to
paging in,
> but not Complete the page in on the next step Instruction;
>
> i thrink p2m_mem_paging_populate -->
> p2m_mem_paging_prep-->p2m_mem_paging_resume ,Complete the process
before you
> start the implementation of the above.
>
> Is that right?
>
> tkx
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
>
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