Re: Problem with vmexit on mtrap
Hi Martin, On Sat, Aug 16, 2014 at 12:33 PM, Martin Steegmanns wrote: > On Tue, Aug 12, 2014 at 06:39:18PM -0700, Neel Natu wrote: >> The VM-exit instruction length field is valid only for a subset of VM >> exits. See section 27.2.4 "Information for VM exits due to instruction >> execution" in the Intel SDM. >> >> In particular, the instruction length is not guaranteed to be valid if >> the VM-exit is due to a hardware exception. Therefore it cannot be >> used to "skip over" the UD2 instruction. >> >> On my machine the VM-exit instruction length field was set to '2' for >> the first UD2 and '5' for the second UD2. > > OK, thx for the clarification. > >> For this specific test, you can either hardcode the instruction length >> to '2' if the VM exit is due to a UD2 or use an instruction like "OUT" >> to a specific I/O port to trigger the monitor-trap-flag on and off. A >> VM-exit due to "OUT" will have the correct value in the VM-exit >> instruction length field. > > But this "instruction length" issue only affects my way to toggle > the MTF bit. The MTF itself does not rely internally on the > "instruction length" field, or does it? > As far as I understand, bhyve does not need a valid instruction length > for MTF, because the handler returns VMEXIT_RESTART. No need for bhyve > to adjust the rip on vmentry. > > If I set the MTF bit via bhyvectl, the guest system still > seems to enter a loop. > My mtrap handler writes the RIP to a file, but all I see are high > addresses e.g: > > 0x806bf0b0 Xapic_isr1 > > According to kdb, these are addresses point to Xapic_isr1 and > interrupt handlers. > > I wonder if a vmexit caused by the MTF could overlay with another > vmexit. With the MTF bit set, I expect the guest system to > behave exactly as without the MTF bit. Of course slower due to > single stepping :). > On my Xeon E5-2650 running at 2.0GHz a single vcpu VM is still not at the login prompt after 7+ hours with MTRAP enabled. However, it is making forward progress and is chugging through the /etc/rc startup scripts very slowly. best Neel > Regards, > Martin ___ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
libvirt and rebooting of a bhyve VM
Roman, I am using libvirt and bhyve according to this XML: http://libvirt.org/drvbhyve.html and it works great. I gave a presentation at BAFUG on this: http://www.slideshare.net/CraigRodrigues1/libvirt-bhyve I have one question. If I reboot the bhyve VM started with libvirt with "shutdown -r now", the VM shuts down, but it does not restart. How can I get the machine to reboot with "shutdown -r now" when started with libvirt? Thanks -- Craig ___ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
Re: vt(4) performance on Hyper-V
Wow, thank you! It helped. Sorry for the noise, it's even written in man vt. 2014-08-18 12:25 GMT+04:00 Luigi Rizzo : > > > > On Mon, Aug 18, 2014 at 9:08 AM, Pavel Timofeev wrote: >> >> Hi! >> Just in case, just so you know. >> I've tried FreeBSD 10-STABLE r270125 with vt(4) on Hyper-V (Win Server >> 2012 DataCenter). >> Its performance is extremely bad (while syscons is ok). >> Here is video http://www.youtube.com/watch?v=62CIKCJ7bog >> > > i think you need to put the following in /boot/loader.conf > > hw.vga.textmode=1 > > otherwise it is very slow even on bare metal. > > cheers > luigi > > >> >> P.S. vt(4) is a bit faster on VirtualBox though when I tried it last time. >> ___ >> freebsd-sta...@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-stable >> To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org" > > > > > -- > -+--- > Prof. Luigi RIZZO, ri...@iet.unipi.it . Dip. di Ing. dell'Informazione > http://www.iet.unipi.it/~luigi/. Universita` di Pisa > TEL +39-050-2211611 . via Diotisalvi 2 > Mobile +39-338-6809875 . 56122 PISA (Italy) > -+--- ___ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
Re: vt(4) performance on Hyper-V
On Mon, Aug 18, 2014 at 9:08 AM, Pavel Timofeev wrote: > Hi! > Just in case, just so you know. > I've tried FreeBSD 10-STABLE r270125 with vt(4) on Hyper-V (Win Server > 2012 DataCenter). > Its performance is extremely bad (while syscons is ok). > Here is video http://www.youtube.com/watch?v=62CIKCJ7bog > > i think you need to put the following in /boot/loader.conf hw.vga.textmode=1 otherwise it is very slow even on bare metal. cheers luigi > P.S. vt(4) is a bit faster on VirtualBox though when I tried it last time. > ___ > freebsd-sta...@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org" > -- -+--- Prof. Luigi RIZZO, ri...@iet.unipi.it . Dip. di Ing. dell'Informazione http://www.iet.unipi.it/~luigi/. Universita` di Pisa TEL +39-050-2211611 . via Diotisalvi 2 Mobile +39-338-6809875 . 56122 PISA (Italy) -+--- ___ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
vt(4) performance on Hyper-V
Hi! Just in case, just so you know. I've tried FreeBSD 10-STABLE r270125 with vt(4) on Hyper-V (Win Server 2012 DataCenter). Its performance is extremely bad (while syscons is ok). Here is video http://www.youtube.com/watch?v=62CIKCJ7bog P.S. vt(4) is a bit faster on VirtualBox though when I tried it last time. ___ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
