On Tue, Jan 5, 2016 at 12:56 PM, Andrew Cooper <andrew.coop...@citrix.com> wrote:
> On 05/01/16 11:49, Tamas K Lengyel wrote: > > Hi all, > I've been stress-testing the built-in emulator using the vm_event response > VM_EVENT_FLAG_EMULATE feature. In the test I've turned all pages > non-readable by default and all trapped instructions to be emulated. My > test code can be found at > <https://github.com/tklengyel/xen/compare/read_emul?expand=1> > https://github.com/tklengyel/xen/compare/read_emul?expand=1. > > The following crash is reproducible and has been verified by Razvan as > well. > > (XEN) p2m.c:1726:d1v0 calling mem_access_emulate_one, kind 0 > (XEN) Failed vm entry (exit reason 0x80000021) caused by invalid guest > state (0). > (XEN) ************* VMCS Area ************** > (XEN) *** Guest State *** > (XEN) CR0: actual=0x000000008001003b, shadow=0x000000008001003b, > gh_mask=ffffffffffffffff > (XEN) CR4: actual=0x00000000000426f9, shadow=0x00000000000406f9, > gh_mask=ffffffffffffffff > (XEN) CR3 = 0x0000000000185000 > (XEN) PDPTE0 = 0x0000000000186001 PDPTE1 = 0x0000000000187001 > (XEN) PDPTE2 = 0x0000000000188001 PDPTE3 = 0x0000000000189001 > (XEN) RSP = 0x000000008276dc28 (0x000000008276dc28) RIP = > 0x00000000826bce1c (0x00000000826bce1c) > (XEN) RFLAGS=0x00000002 (0x00000002) DR7 = 0x0000000000000400 > (XEN) Sysenter RSP=000000008078b000 CS:RIP=0008:00000000826830c0 > (XEN) sel attr limit base > (XEN) CS: 0008 0c09b ffffffff 0000000000000000 > (XEN) DS: 0023 0c0f3 ffffffff 0000000000000000 > (XEN) SS: 0010 0c093 ffffffff 0000000000000000 > (XEN) ES: 0023 0c0f3 ffffffff 0000000000000000 > (XEN) FS: 0030 04093 00003748 0000000082770c00 > (XEN) GS: 0000 1c000 ffffffff 0000000000000000 > (XEN) GDTR: 000003ff 0000000080b95000 > (XEN) LDTR: 0000 1c000 ffffffff 0000000000000000 > (XEN) IDTR: 000007ff 0000000080b95400 > (XEN) TR: 0028 0008b 000020ab 00000000801da000 > (XEN) EFER = 0x0000000000000000 PAT = 0x0007010600070106 > (XEN) PreemptionTimer = 0x00000000 SM Base = 0x00000000 > (XEN) DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 > (XEN) Interruptibility = 00000000 ActivityState = 00000000 > (XEN) *** Host State *** > (XEN) RIP = 0xffff82d0802075c0 (vmx_asm_vmexit_handler) RSP = > 0xffff830430d97f90 > (XEN) CS=e008 SS=0000 DS=0000 ES=0000 FS=0000 GS=0000 TR=e040 > (XEN) FSBase=0000000000000000 GSBase=0000000000000000 > TRBase=ffff830430d9bc00 > (XEN) GDTBase=ffff830430d8c000 IDTBase=ffff830430d98000 > (XEN) CR0=000000008005003b CR3=00000004136d0000 CR4=00000000000426e0 > (XEN) Sysenter RSP=ffff830430d97fc0 CS:RIP=e008:ffff82d08024db30 > (XEN) EFER = 0x0000000000000000 PAT = 0x0000050100070406 > (XEN) *** Control State *** > (XEN) PinBased=0000003f CPUBased=b6a075fa SecondaryExec=000000eb > (XEN) EntryControls=000051ff ExitControls=000fefff > (XEN) ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000 > (XEN) VMEntry: intr_info=800000d1 errcode=00000000 ilen=00000000 > (XEN) VMExit: intr_info=00000000 errcode=00000000 ilen=00000003 > (XEN) reason=80000021 qualification=0000000000000000 > (XEN) IDTVectoring: info=800000d1 errcode=00000000 > (XEN) TSC Offset = 0x0000004ed9c86354 > (XEN) TPR Threshold = 0x00 PostedIntrVec = 0x00 > (XEN) EPT pointer = 0x000000041124e01e EPTP index = 0x0000 > (XEN) Virtual processor ID = 0x0011 VMfunc controls = 0000000000000000 > (XEN) ************************************** > (XEN) domain_crash called from vmx.c:2761 > > Any tips on how to further debug this issue? > > > Do you have a log of the instructions emulated? > I don't. Is there an easy way to get that beside manually sprinkling debug messages around in the emulator? > > Has the emulator by any chance just emulated setting CR4.PAE? > Possibly but I don't think so as the guest has already been fully booted so I would not expect it to touch that. Thanks, Tamas
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