I tried that, but it seems like I'm getting an interrupt storm on the debugger VM (CPU spends all its time in the kernel) when I try to attach the debugger. This observation furthers my suspicion that there is communication, but there is something wrong with the protocol...
On Tue, Jun 22, 2021 at 12:43 PM Tamas K Lengyel <tamas.k.leng...@gmail.com> wrote: > I used Xen 4.15 and a pretty new version of Windows 10. It is a bit > finicky, you have to run the debug commands on the debugee and then > reboot. When the VM is rebooting the domain ID changes so you have to > start the serial bridge then. Windbg will attach afterwards. Just make > sure both VMs have serial='pty' set in their config file. > > Tamas > > On Tue, Jun 22, 2021 at 12:33 PM Neil Sikka <neilsi...@gmail.com> wrote: > > > > Thanks for the quick response, Tamas. I tried what you said and windbg > waits and the debugee hangs when I click the break button in windbg, but I > don't see any output in windbg. This means that there is SOME communication > over the serial port that causes the debugee to hang when I click break. > Could it be a debugger protocol issue? I also tried the guidance here by > running the crlf program: > > https://www.qubes-os.org/doc/windows-debugging/ > > But windbg waits and the debugee hangs in a similar manner. > > > > What versions of WIndows and Xen are you using? > > > > On Tue, Jun 22, 2021 at 12:10 PM Tamas K Lengyel < > tamas.k.leng...@gmail.com> wrote: > >> > >> I have managed to get windbg working with a serial bridge between two > >> Win10 VMs using the following script: > >> > https://github.com/intel/kernel-fuzzer-for-xen-project/blob/master/scripts/serial-bridge.sh > . > >> The debugee has to enable a couple options so that windbg can attach: > >> > https://github.com/intel/kernel-fuzzer-for-xen-project/blob/master/scripts/debug.cmd > . > >> > >> Tamas > >> > >> On Tue, Jun 22, 2021 at 12:01 PM Neil Sikka <neilsi...@gmail.com> > wrote: > >> > > >> > Hello, > >> > Has anyone gotten a Windows10 (Version 1709 of later) kernel debugger > attached when running the Windows10 debugger VM and the Windows10 debugee > VM on Xen 4.13.0 hypervisor? I am getting a "NIC hardware initialization > failed" error. I tried the suggestions in the discussion here ( > https://bugzilla.redhat.com/show_bug.cgi?id=1947015): > >> > -cpu > Skylake-Server-IBRS,ss=on,vmx=on,hypervisor=on,tsc-adjust=on,clflushopt=on,umip=on,pku=on,md-clear=on,stibp=on,arch-capabilities=on,ssbd=on,xsaves=on,ibpb=on,amd-ssbd=on, > \ > >> > > skip-l1dfl-vmentry=on,mpx=off,hv-time,hv-relaxed,hv-vapic,hv-spinlocks=0x1fff,hv-vendor-id=KVMKVMKVM > >> > > >> > note: i had to remove the following 2 arguments due to errors from > QEMU: > >> > pschange-mc-no=on > >> > hv_vpindex > >> > > >> > Here was the error: > >> > C:\Users\user\Desktop\oldDebuggers\x64>kdnet.exe > >> > > >> > Network debugging is supported on the following NICs: > >> > busparams=0.4.0, Intel(R) PRO/1000 MT Network Connection, Plugged in. > >> > The Microsoft hypervisor running this VM does not support KDNET. > >> > Please upgrade to the hypervisor shipped in Windows 8 or WS2012 or > later. > >> > > >> > KDNET initialization failed. Status = 0xC0000182. > >> > NIC hardware initialization failed. > >> > > >> > I am using an Intel e1000 NIC emulated through QEMU because its > supposedly a supported NIC for Windows kernel NET debugging. > >> > > >> > Thanks in Advance! > >> > > >> > -- > >> > My Blog: http://www.neilscomputerblog.blogspot.com/ > >> > Twitter: @neilsikka > > > > > > > > -- > > My Blog: http://www.neilscomputerblog.blogspot.com/ > > Twitter: @neilsikka > -- My Blog: http://www.neilscomputerblog.blogspot.com/ Twitter: @neilsikka
