Re: [Xen-devel] Weird altp2m behaviour when switching early to a new view

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

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.


Thanks,
Razvan

Attachment: altp2m_vga.patch
Description: Text Data

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