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Re: [Xen-devel] Weird altp2m behaviour when switching early to a new view
- To: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Mon, 16 Apr 2018 18:47:18 +0100
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- Cc: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>, "Tian, Kevin" <kevin.tian@xxxxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>
- Delivery-date: Mon, 16 Apr 2018 17:47:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 04/13/2018 03:44 PM, Razvan Cojocaru wrote:
> On 04/11/2018 11:04 AM, Razvan Cojocaru wrote:
>> Debugging continues.
>
> Finally, the attached patch seems to get the display unstuck in my
> scenario, although for one guest I get:
>
> (XEN) d2v0 Unexpected vmexit: reason 49
> (XEN) domain_crash called from vmx.c:4120
> (XEN) Domain 2 (vcpu#0) crashed on cpu#1:
> (XEN) ----[ Xen-4.11-unstable x86_64 debug=y Not tainted ]----
> (XEN) CPU: 1
> (XEN) RIP: 0010:[<fffff96000842354>]
> (XEN) RFLAGS: 0000000000010246 CONTEXT: hvm guest (d2v0)
> (XEN) rax: fffff88003000000 rbx: fffff900c0083db0 rcx: 00000000aa55aa55
> (XEN) rdx: fffffa80041bdc41 rsi: fffff900c00c69a0 rdi: 0000000000000001
> (XEN) rbp: 0000000000000000 rsp: fffff88002ee9ef0 r8: fffffa80041bdc40
> (XEN) r9: fffff80001810e80 r10: fffffa800342aa70 r11: fffff88002ee9e80
> (XEN) r12: 0000000000000005 r13: 0000000000000001 r14: fffff900c00c08b0
> (XEN) r15: 0000000000000001 cr0: 0000000080050031 cr4: 00000000000406f8
> (XEN) cr3: 00000000ef771000 cr2: fffff900c00c8000
> (XEN) fsb: 00000000fffde000 gsb: fffff80001810d00 gss: 000007fffffdc000
> (XEN) ds: 002b es: 002b fs: 0053 gs: 002b ss: 0018 cs: 0010
>
> i.e. EXIT_REASON_EPT_MISCONFIG - so not of the woods yet. I am hoping
> somebody more familiar with the code can point to a more elegant
> solution if one exists.
I think I have an idea what's going on, but it's complicated. :-)
Basically, the logdirty functionality isn't simple, and needs careful
thought on how to integrate it. I'll write some more tomorrow, and see
if I can come up with a solution.
-George
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