Re: [PATCH 01/24] PVH xen: Add readme docs/misc/pvh-readme.txt

[Mukesh Rathor <mukesh.rathor@oracle.com>]

On Thu, 18 Jul 2013 11:09:03 +0100
Ian Campbell <Ian.Campbell@citrix.com> wrote:

> On Wed, 2013-07-17 at 19:32 -0700, Mukesh Rathor wrote:
> > Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
> > ---
> >  docs/misc/pvh-readme.txt |   40
> > ++++++++++++++++++++++++++++++++++++++++ 1 files changed, 40
> > insertions(+), 0 deletions(-) create mode 100644
> > docs/misc/pvh-readme.txt
> > 
> > diff --git a/docs/misc/pvh-readme.txt b/docs/misc/pvh-readme.txt
> > new file mode 100644
> > index 0000000..a813373
> > --- /dev/null
> > +++ b/docs/misc/pvh-readme.txt
> > @@ -0,0 +1,40 @@
> > +
> > +PVH : a pv guest running in an HVM container. HAP is required for
> > PVH. +
> > +See:
> > http://blog.xen.org/index.php/2012/10/23/the-paravirtualization-spectrum-part-1-the-ends-of-the-spectrum/
> > + +
> > +The initial phase targets the booting of a 64bit UP/SMP linux
> > guest in PVH +mode. This is done by adding: pvh=1 in the config
> > file. xl, and not xm, is +supported. Phase I patches are broken
> > into three parts:
> > +   - xen changes for booting of 64bit PVH guest
> > +   - tools changes for creating a PVH guest
> > +   - boot of 64bit dom0 in PVH mode.
> > +
> > +The best way to find all the patches is to use "git log|grep -i
> > PVH", both +in xen and linux tree.
> > +
> > +Following fixme's exist in the code:
> > +  - Add support for more memory types in arch/x86/hvm/mtrr.c.
> > +  - arch/x86/time.c: support more tsc modes.
> > +  - check_guest_io_breakpoint(): check/add support for IO
> > breakpoint.
> > +  - implement arch_get_info_guest() for pvh.
> > +  - vmxit_msr_read(): during AMD port go thru
> > hvm_msr_read_intercept() again.
> > +  - verify bp matching on emulated instructions will work same as
> > HVM for
> > +    PVH guest. see instruction_done() and
> > check_guest_io_breakpoint(). +
> > +Following remain to be done for PVH:
> > +   - AMD port.
> > +   - 32bit PVH guest support in both linux and xen. Xen changes
> > are tagged 
> > +     "32bitfixme".
> > +   - Add support for monitoring guest behavior. See
> > hvm_memory_event* functions
> > +     in hvm.c
> > +   - vcpu hotplug support
> > +   - Live migration of PVH guests.
> > +   - Avail PVH dom0 of posted interrupts. (This will be a big win).
> > +
> > +
> > +Note, any emails to must be cc'd to Xen-devel@lists.xensource.com.
> 
> lists.xen.org please, lets not get two domain names behind ;-)

I'll just say xen devel mailing list. The reason is I often get emails
about debugger and when I cc xen-devel, some people get upset about it!
I wanna say this so people can send from appropriate email that they
are OK with being public.


> Is there a description somewhere in the series of what PVH means in
> terms of the guest visible ABI? i.e. documentation of the delta from
> the regular PV mode? I had a skim through and didn't spot it.

No. The ABIs are not as affected, thanks to pre-existing auto translate
mode. But, I suppose after all the patches are checked in, I can write
up something. 

thanks
Mukesh