Re: [Xen-devel] [PATCH] add RDMSR/WRMSR instruction emulation toVMXAssist decoder

[Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>]

This bug is fixed by xen-unstable 11713:79b56c02b836 -- the VMX code was
not tracking writes to CR4 that happen when CR0.PE=0, so the second vcpu
was being shadowed in the wrong paging mode, and going into a PF loop.

Win2k3 (ee sp1 pae=1 acpi=1 apic=1 vcpus=2) doesn't complete the install
process yet, but gets as far as "Installing Devices" in the GUI
installer now.

Tim.

At 13:07 +0800 on 30 Sep (1159621646), Li, Xin B wrote:
> After applying this patch, while booting a 2 vCPUs PAE SMP Windows 2003 
> server in VMX, I got:
> 
> (XEN) sh error: sh_remove_shadows(): can't find all shadows of mfn 23ecf7 
> (shadow_flags=80000008)
> (XEN) domain_crash called from common.c:2197
> (XEN) Domain 1 (vcpu#0) crashed on cpu#3:
> (XEN) ----[ Xen-3.0-unstable  x86_64  debug=n  Not tainted ]----
> (XEN) CPU:    3
> (XEN) RIP:    0008:[<000000008086bf9b>]
> (XEN) RFLAGS: 0000000000010283   CONTEXT: hvm
> (XEN) rax: 0000000000000002   rbx: 00000000821a57a8   rcx: 00000000821a3008
> (XEN) rdx: 0000000000000002   rsi: 00000000821a3020   rdi: 00000000821a54d0
> (XEN) rbp: 00000000f885ebd8   rsp: 00000000f885ea98   r8:  0000000000000000
> (XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
> (XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
> (XEN) r15: 0000000000000000   cr0: 000000008001003b   cr4: 0000000000000671
> (XEN) cr3: 00000000002677a0   cr2: 00000000e1005004
> (XEN) ds: 0023   es: 0023   fs: 0030   gs: 0000   ss: 0010   cs: 0008
> 
> -Xin
> 
> >-----Original Message-----
> >From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> >[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Li, Xin B
> >Sent: 2006?$BG/9?$B7n30?$BF| 12:55
> >To: xen-devel@xxxxxxxxxxxxxxxxxxx
> >Subject: [Xen-devel] [PATCH] add RDMSR/WRMSR instruction 
> >emulation toVMXAssist decoder
> >
> >add RDMSR/WRMSR instruction emulation to VMXAssist decoder
> >
> >AP of PAE SMP windows will use it to set NX bit in EFER.
> >
> >Signed-off-by: Xin Li <xin.b.li@xxxxxxxxx>
> >
> 
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> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel

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