Re: [Xen-devel] how to disable build of pv-shim?

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.05.19 at 13:11, <roger.pau@xxxxxxxxxx> wrote:
> On Tue, May 14, 2019 at 03:26:53AM -0600, Jan Beulich wrote:
>> >>> On 14.05.19 at 10:55, <roger.pau@xxxxxxxxxx> wrote:
>> > On Mon, May 13, 2019 at 04:28:12PM +0100, Wei Liu wrote:
>> >> On Mon, May 13, 2019 at 05:20:05PM +0200, Roger Pau Monné wrote:
>> >> > On Mon, May 13, 2019 at 04:53:21PM +0200, Olaf Hering wrote:
>> >> > > What is the recommended way to disable CONFIG_PV_SHIM, which is set in
>> >> > > tools/firmware/Makefile? From my understanding there is no way to 
>> > influence
>> >> > > its value from outside, which means the build always enters xen-dir/.
>> >> > 
>> >> > I think the following should do the trick.
>> >> > 
>> >> > Let me know if that works for you and I will submit it formally.
>> >> > 
>> >> > Thanks!
>> >> > 
>> >> > ---8<---
>> >> > diff --git a/config/Tools.mk.in b/config/Tools.mk.in
>> >> > index 98245f63c9..84ddb1a542 100644
>> >> > --- a/config/Tools.mk.in
>> >> > +++ b/config/Tools.mk.in
>> >> > @@ -75,3 +75,5 @@ TINFO_LIBS          := @TINFO_LIBS@
>> >> >  ARGP_LDFLAGS        := @argp_ldflags@
>> >> >  
>> >> >  FILE_OFFSET_BITS    := @FILE_OFFSET_BITS@
>> >> > +
>> >> > +CONFIG_PV_SHIM      := @pvshim@
>> >> > diff --git a/tools/configure.ac b/tools/configure.ac
>> >> > index c9fd69ddfa..8df2fd604b 100644
>> >> > --- a/tools/configure.ac
>> >> > +++ b/tools/configure.ac
>> >> > @@ -492,4 +492,15 @@ AC_ARG_ENABLE([9pfs],
>> >> >  
>> >> >  AC_SUBST(ninepfs)
>> >> >  
>> >> > +AC_ARG_ENABLE([pvshim],
>> >> > +    AS_HELP_STRING([--disable-pvshim], [Disable pvshim build (x86 
>> >> > only, 
>> > enabled by default)]),
>> >> > +    [AS_IF([test "x$enable_pvshim" = "xno"], [pvshim=n], [pvshim=y])], 
>> >> > [
>> >> > +    case "$host_cpu" in
>> >> > +        i[[3456]]86|x86_64)
>> >> > +           pvshim="y";;
>> >> 
>> >> Since xen doesn't build on 32bit anymore you may want to exclude
>> >> i[3456]86 here?
>> > 
>> > Oh, I didn't realize this. Is it true for all distros?
>> 
>> It's a property of the hypervisor (note: not the tool stack), as of 4.3.
> 
> But the property is that the hypervisor requires an amd64 compatible
> CPU to run, but it should build fine on 32bit.

Except that a typical gcc on 32-bit won't be able to build (64-bit)
Xen, nor would there be any place to enforce the necessary
XEN_TARGET_ARCH:=x86_64.

Jan


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