> The default segment descriptors are *always* available. A guest can only
> install up to a 14-page GDT: the 15th and 16th pages are reserved by Xen
> and always present.
Ok, managed to fixup that, switching to the default descriptors and
killing the GDT works, so the gdt doesn't stop validating any more.
But I ran into the next bug now. I think we have a funny
chicken-and-egg problem when validating a self-consistent but new page
table set (which also maps itself) from scratch, see messages attached
below.
cheers,
Gerd
--
Gerd 'just married' Hoffmann <kraxel@xxxxxxx>
I'm the hacker formerly known as Gerd Knorr.
http://www.suse.de/~kraxel/just-married.jpeg
(XEN) DOM1: (file=mm.c, line=1501) Bad type (saw 33020001 != exp e0000000) for
mfn 1c711 (pfn 0)
(XEN) DOM1: (file=mm.c, line=479) Error getting mfn 1c711 (pfn 0) from L1 entry
1c711063 for dom1
(XEN) DOM1: (file=mm.c, line=685) Failure in alloc_l1_table: entry 0
(XEN) DOM1: (file=mm.c, line=1542) Error while validating mfn 18c92 (pfn 35a8)
for type 20000000: caf=80000003 taf=20000001
(XEN) DOM1: (file=mm.c, line=402) Attempt to create linear p.t. with write perms
(XEN) DOM1: (file=mm.c, line=846) Failure in alloc_l2_table: entry 0
(XEN) DOM1: (file=mm.c, line=1542) Error while validating mfn 18c95 (pfn 35a5)
for type 40000000: caf=80000003 taf=40000001
(XEN) DOM1: (file=mm.c, line=1579) trying slow path via idle pagetables ...
(XEN) DOM1: (file=mm.c, line=1501) Bad type (saw 40000001 != exp e0000000) for
mfn 18c95 (pfn 35a5)
(XEN) DOM1: (file=mm.c, line=479) Error getting mfn 18c95 (pfn 35a5) from L1
entry 18c95063 for dom1
(XEN) DOM1: (file=mm.c, line=685) Failure in alloc_l1_table: entry 421
(XEN) DOM1: (file=mm.c, line=1542) Error while validating mfn 18c85 (pfn 35b5)
for type 200d0000: caf=80000002 taf=200d0001
(XEN) DOM1: (file=mm.c, line=402) Attempt to create linear p.t. with write perms
(XEN) DOM1: (file=mm.c, line=846) Failure in alloc_l2_table: entry 13
(XEN) DOM1: (file=mm.c, line=1542) Error while validating mfn 18c95 (pfn 35a5)
for type 40000000: caf=80000002 taf=40000001
(XEN) DOM1: (file=mm.c, line=1593) Fatal error while installing new baseptr
18c95
(XEN) domain_crash called from mm.c:1594
(XEN) Domain 1 (vcpu#0) crashed on cpu#1:
(XEN) ----[ Xen-3.0.0 Not tainted ]----
(XEN) CPU: 1
(XEN) EIP: e019:[<c010ed3d>]
(XEN) EFLAGS: 00010206 CONTEXT: guest
(XEN) eax: c0012000 ebx: 00000000 ecx: fbf8d000 edx: 18c95000
(XEN) esi: 035a4000 edi: c0732400 ebp: c3e57e88 esp: c3e57e60
(XEN) cr0: 8005003b cr3: 001b6000
(XEN) ds: e021 es: e021 fs: e021 gs: e021 ss: e021 cs: e019
(XEN) Guest stack trace from esp=c3e57e60:
(XEN) Fault while accessing guest memory.
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