Hi,

I've just successfully run FreeBSD 9.1 based guest with 'pvhvm_v8' based kernel 
under Xen 3.4.4.

Hypervisor details:
# xm info
host                   : *******
release                : 2.6.18-348.2.1.el5xen
version                : #1 SMP Tue Mar 5 17:05:33 EST 2013
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2128
hw_caps                : 
bfebfbff:28100800:00000000:00000340:009ce3bd:00000000:00000001:00000000
virt_caps              : hvm
total_memory           : 6135
free_memory            : 262
node_to_cpu            : node0:0-3
node_to_memory         : node0:262
xen_major              : 3
xen_minor              : 4
xen_extra              : .4
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 
hvm-3.0-x86_32p hvm-3.0-x86_64 
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
cc_compiler            : gcc version 4.1.2 20080704 (Red Hat 4.1.2-52)
cc_compile_by          : root
cc_compile_domain      : ******
cc_compile_date        : Wed Sep  5 18:01:10 EEST 2012
xend_config_format     : 4


DomU details:
# xm list --long h283bpm53f9rnx
(domain
    (domid 61)
    (on_crash restart)
    (uuid a2cbcba9-1d66-87ce-6d2f-412e70eab051)
    (bootloader_args )
    (vcpus 2)
    (name h283bpm53f9rnx)
    (on_poweroff destroy)
    (on_reboot restart)
    (cpus (() ()))
    (bootloader )
    (maxmem 1024)
    (memory 1024)
    (shadow_memory 10)
    (features )
    (on_xend_start ignore)
    (on_xend_stop ignore)
    (start_time 1369235607.92)
    (cpu_time 31.914003553)
    (online_vcpus 2)
    (image
        (hvm
            (kernel )
            (videoram 4)
            (hpet 0)
            (stdvga 0)
            (loader /usr/lib/xen/boot/hvmloader)
            (vncunused 1)
            (xen_platform_pci 1)
            (boot cd)
            (rtc_timeoffset 7202)
            (pci ())
            (pae 1)
            (vpt_align 1)
            (hap 1)
            (viridian 0)
            (acpi 1)
            (localtime 0)
            (timer_mode 1)
            (vnc 1)
            (nographic 0)
            (guest_os_type default)
            (pci_msitranslate 1)
            (apic 1)
            (monitor 0)
            (usbdevice tablet)
            (device_model /usr/lib64/xen/bin/qemu-dm)
            (pci_power_mgmt 0)
            (usb 0)
            (xauthority /root/.Xauthority)
            (isa 0)
            (notes (SUSPEND_CANCEL 1))
        )
    )
    (status 2)
    (state -b----)
    (store_mfn 1044476)
    (device
        (vif
            (bridge xnh5getjoj54ke)
            (uuid 6133c146-48ea-b7a5-0263-fda98e1a30fe)
            (script /etc/xen/scripts/vif-bridge)
            (ip 83.170.81.183)
            (mac 00:16:3e:a4:02:5a)
            (vifname t2vd5w22msrv5d)
            (backend 0)
        )
    )
    (device
        (vbd
            (protocol x86_64-abi)
            (uuid dd857cd1-2a4c-ea21-a5a5-e95d811f607a)
            (bootable 1)
            (dev hda:disk)
            (uname phy:/dev/9yblt1m70pdtdp/ddfhogyred6bby)
            (mode w)
            (backend 0)
            (bootable 1)
            (VDI )
        )
    )
    (device
        (vbd
            (protocol x86_64-abi)
            (uuid 19cae15c-354d-77cb-57ec-dc313f1d05ba)
            (bootable 0)
            (dev hdb:disk)
            (uname phy:/dev/9yblt1m70pdtdp/dhnnwhs6jh9kdd)
            (mode w)
            (backend 0)
            (bootable 0)
            (VDI )
        )
    )
    (device
        (vbd
            (protocol x86_64-abi)
            (uuid 2b97ec8c-0cc5-7197-f510-63c272449680)
            (bootable 0)
            (dev hdc:disk)
            (uname phy:/dev/9yblt1m70pdtdp/d1jilc7s7jxsaq)
            (mode w)
            (backend 0)
            (bootable 0)
            (VDI )
        )
    )
    (device
        (vbd
            (protocol x86_64-abi)
            (uuid 1b472270-1ef3-2f49-81f1-031cc00c0eb7)
            (bootable 0)
            (dev hdd:cdrom)
            (uname file:/tools/freebsd/boot-freebsd-generic.iso)
            (mode r)
            (backend 0)
            (bootable 0)
            (VDI )
        )
    )
    (device
        (vfb
            (vncunused 1)
            (vnc 1)
            (uuid b3defeea-4acc-1408-9b22-71547a64e705)
            (location 0.0.0.0:5900)
        )
    )
    (device
        (console
            (protocol vt100)
            (location 4)
            (uuid 58a089ce-a4d0-037e-23e8-9df37b2bd5da)
        )
    )
)


DomU from "inside":
# uname -a
FreeBSD yurak1.vm 10.0-CURRENT FreeBSD 10.0-CURRENT #0 r+03cdadc: Wed May 22 
17:47:40 EEST 2013     r...@yurak1.vm:/usr/obj/data/freebsd/sys/XENHVM  amd64


I'll also set up one (hope will have some time) under Xen 4.2.2 tomorrow.
---
Yura

On May 13, 2013, at 21:32 PM, Roger Pau Monné <roger....@citrix.com> wrote:

> Hello,
> 
> Recently Justin T Gibbs, Will Andrews and myself have been working on
> improving the Xen support in FreeBSD. The main goal of this was to bring
> full PVHVM support to FreeBSD, right now FreeBSD is only using PV
> interfaces for disk and network interfaces when running as a HVM guest.
> The main benefits of this changes are that Xen virtual interrupts (event
> channels) are now delivered to the guest using a vector callback
> injection, that is a per-cpu mechanism that allows each vCPU to have
> different interrupts assigned, so for example network and disk
> interrupts are delivered to different vCPUs in order to improve
> performance. With this changes FreeBSD also uses PV timers when running
> as an HVM guest, which should provide better time keeping and reduce the
> virtualization overhead, since emulated timers are no longer used. PV
> IPIs can also be used inside a HVM guest, but this will be implemented
> later.
> 
> Right now the code is in a state where it can be tested by users, so we
> would like to encourage FreeBSD and Xen users to test it and provide
> feedback.
> 
> The code is available in the following git repository, under the branch
> pvhvm_v5:
> 
> http://xenbits.xen.org/gitweb/?p=people/royger/freebsd.git;a=summary
> 
> Also, I've created a wiki page that explains how to set up a FreeBSD
> PVHVM for testing:
> 
> http://wiki.xen.org/wiki/Testing_FreeBSD_PVHVM
> _______________________________________________
> freebsd-xen@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-xen
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