Sanjeepan, Vivekananthan
2006-Dec-27 18:28 UTC
[Xen-devel] FreeBSD boot loader problem on VT-x
Hi there, I tried unsuccessfully to boot FreeBSD HVM on VT-x hardware. Reading a couple of discussion on xen-devel list, I found that other people also have the same problem. The problem is identified with real mode emulation in VMXAssist. (http://lists.xensource.com/archives/html/xen-devel/2006-05/msg01300.htm l) In May 2006, one post mentioned plans to replace VMX assist with full emulation. (http://lists.xensource.com/archives/html/xen-devel/2006-05/msg01442.htm l). I would like to know if there is a way to get the full emulation feature if available. If not, is there an alternative way to boot FreeBSD on VT-x. Thanks, Sanjee _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Hi> > >I tried unsuccessfully to boot FreeBSD HVM on VT-x hardware. Reading a >couple of discussion on xen-devel list, I found that other people also >have the same problem. The problem is identified with real mode >emulation in VMXAssist. >(http://lists.xensource.com/archives/html/xen-devel/2006-05/msg01300.htm >l) > > > >In May 2006, one post mentioned plans to replace VMX assist with full >emulation. >(http://lists.xensource.com/archives/html/xen-devel/2006-05/msg01442.htm >l). I would like to know if there is a way to get the full emulation >feature if available. If not, is there an alternative way to boot >FreeBSD on VT-x.Information about this project is described here: http://wiki.xensource.com/xenwiki/HVM/V2E Basically, it adds support for extracting CPU state from Xen and putting it into the Qemu CPU emulator and running fully emulated within the device model (currently in dom0) for a bit. The state is pushed back into Xen when emulation is no longer necessary and execution continues as normal. The wiki page includes an address for the repository. It''s working for booting Linux guests but for other OSes YMMV. If you do test this with FreeBSD, could you please let us know how it goes / update the wiki page? I''m sure extra data points would be interesting to some. Cheers, Mark _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Sanjeepan, Vivekananthan
2006-Dec-28 19:49 UTC
RE: [Xen-devel] FreeBSD boot loader problem on VT-x
Please find my experience with booting FreeBSD on xen-unstable-hvm.hg Without Anthony''s updates, I was able compile and boot xen. However, FreeBSD 6.1 HVM stalled and didn''t boot successfully. Please find the qemu-dm.log for the session below. Xm list show the domain with no state. Domain-0 0 1933 8 r----- 1513.1 FreeBSD 3 1024 1 ------ 0.0 With Anthony''s updates, I was not able to compile successfully. I guess it is a work in progress. I will be happy to try it again once the latest xen-unstable is merged with HVM code. Thanks, Sanjee Qemu-log -------------------------------------- domid: 2 qemu: the number of cpus is 1 shared page at pfn:3ffff, mfn: 71400 buffered io page at pfn:3fffd, mfn: 71402 char device redirected to /dev/pts/1 Partition has PAE enabled False I/O request ... in-service already: 0, pvalid: 0, port: 0, data: 0, count: 0, size: 0 HVM Loader Detected Xen v3.0-unstable Writing SMBIOS tables ... Loading ROMBIOS ... Loading Cirrus VGABIOS ... Loading ACPI ... VMX go ... IOREQ_TYPE_EMULATE Enter: Registers: rax 0x0000000000000000, rbx 0x0000000000000000, rcx 0x0000000000000000 rdx 0x0000000000000000, rsi 0x0000000000000000, rdi 0x0000000000000000 rbp 0x0000000000000000, rsp 0x0000000000000000, rip 0x000000000000fff0 r8 0x0000000000000000, r9 0x0000000000000000, r10 0x0000000000000000 r11 0x0000000000000000, r12 0x0000000000000000, r13 0x0000000000000000 r14 0x0000000000000000, r15 0x0000000000000000 rflags 0x0000000000000002 Control registers: cr0 0x60000010, cr2 0x00000000, cr3 0x00000000, cr4 0x00000000 Descriptors: cs: 0xf000, base 0xf0000, limit 0xffff, arbytes 0x89b ds: 0x0, base 0x0, limit 0xffff, arbytes 0x893 es: 0x0, base 0x0, limit 0xffff, arbytes 0x893 ss: 0x0, base 0x0, limit 0xffff, arbytes 0x893 fs: 0x0, base 0x0, limit 0xffff, arbytes 0x893 gs: 0x0, base 0x0, limit 0xffff, arbytes 0x893 idt: base 0x0, limit 0x3ff gdt: base 0x0, limit 0x3ff ldtr: 0x0, base 0x0, limit 0x3ff, arbytes 0x82 tr: 0x0, base 0x0, limit 0x0, arbytes 0x0 EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000000 ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000 EIP=0000fff0 EFL=00000002 [-------] CPL=0 II=0 A20=1 HLT=0 ES =0000 00000000 0000ffff 00009300 CS =f000 000f0000 0000ffff 00009b00 SS =0000 00000000 0000ffff 00009300 DS =0000 00000000 0000ffff 00009300 FS =0000 00000000 0000ffff 00009300 GS =0000 00000000 0000ffff 00009300 LDT=0000 00000000 000003ff 00008200 TR =0000 00000000 00000000 00000000 GDT= 00000000 000003ff IDT= 00000000 000003ff -----Original Message----- From: M.A. Williamson [mailto:maw48@hermes.cam.ac.uk] On Behalf Of M.A. Williamson Sent: Wednesday, December 27, 2006 6:29 PM To: Sanjeepan, Vivekananthan Cc: xen-devel@lists.xensource.com; khoa@ibm.com Subject: Re: [Xen-devel] FreeBSD boot loader problem on VT-x Hi> > >I tried unsuccessfully to boot FreeBSD HVM on VT-x hardware. Reading a >couple of discussion on xen-devel list, I found that other people also >have the same problem. The problem is identified with real mode >emulation in VMXAssist. >(http://lists.xensource.com/archives/html/xen-devel/2006-05/msg01300.htm>l) > > > >In May 2006, one post mentioned plans to replace VMX assist with full >emulation. >(http://lists.xensource.com/archives/html/xen-devel/2006-05/msg01442.htm>l). I would like to know if there is a way to get the full emulation >feature if available. If not, is there an alternative way to boot >FreeBSD on VT-x.Information about this project is described here: http://wiki.xensource.com/xenwiki/HVM/V2E Basically, it adds support for extracting CPU state from Xen and putting it into the Qemu CPU emulator and running fully emulated within the device model (currently in dom0) for a bit. The state is pushed back into Xen when emulation is no longer necessary and execution continues as normal. The wiki page includes an address for the repository. It''s working for booting Linux guests but for other OSes YMMV. If you do test this with FreeBSD, could you please let us know how it goes / update the wiki page? I''m sure extra data points would be interesting to some. Cheers, Mark _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel