Re: [Xen-devel] [PATCH v2] xen/events: Always allocate legacy interrupts on PV guests

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 11/20/2015 10:36 AM, Stefano Stabellini wrote:
> On Fri, 20 Nov 2015, Boris Ostrovsky wrote:
> > On 11/20/2015 06:24 AM, Stefano Stabellini wrote:
> > > On Wed, 18 Nov 2015, Boris Ostrovsky wrote:
> > > > After commit 8c058b0b9c34 ("x86/irq: Probe for PIC presence before
> > > > allocating descs for legacy IRQs") early_irq_init() will no longer
> > > > preallocate descriptors for legacy interrupts if PIC does not
> > > > exist, which is the case for Xen PV guests.
> > > >
> > > > Therefore we may need to allocate those descriptors ourselves.
> > > >
> > > > Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> > > > Suggested-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> > > You need to do this for arm64 too.
> > >
> > > FYI you can download arm64 cross-compilers from
> > > https://releases.linaro.org/14.04/components/toolchain/binaries/
> > > then you can use them by exporting ARCH=arm64 and
> > > CROSS_COMPILE=/path/to/gcc-linaro-aarch64-linux-gnu-version/bin/aarch64-linux-gnu-
> > I did test on arm but didn't realize that arm64 uses different include files.
> >
> > Does arm64 not have any legacy interrupts?
> >
> > BTW, I got this build error:
> >
> >    STUBCPY drivers/firmware/efi/libstub/lib-sort.stub.o
> > 0000000000000000 R_AARCH64_ABS64   __efistub_sort
> > 0000000000000008 R_AARCH64_ABS64   .init__ksymtab_strings
> > drivers/firmware/efi/libstub/lib-sort.stub.o: absolute symbol references not
> > allowed in the EFI stub
> > drivers/firmware/efi/libstub/Makefile:63: recipe for target
> > 'drivers/firmware/efi/libstub/lib-sort.stub.o' failed
> > make[4]: *** [drivers/firmware/efi/libstub/lib-sort.stub.o] Error 1
> > scripts/Makefile.build:403: recipe for target 'drivers/firmware/efi/libstub'
> > failed
> > make[3]: *** [drivers/firmware/efi/libstub] Error 2
> > scripts/Makefile.build:403: recipe for target 'drivers/firmware/efi' failed
> > make[2]: *** [drivers/firmware/efi] Error 2
> > scripts/Makefile.build:403: recipe for target 'drivers/firmware' failed
> > make[1]: *** [drivers/firmware] Error 2
> > Makefile:943: recipe for target 'drivers' failed
> > make: *** [drivers] Error 2
> >
> > I worked around this by removing some of EFI config options but presumably
> > this needs to be properly fixed.
> Interesting. This build error could be something new. Could you please
> post your kernel config?
Attached.

This, BTW, is on a relatively old toolstack:
gcc version 4.8.2 20131014 (prerelease) (crosstool-NG 
linaro-1.13.1-4.8-2013.10 - Linaro GCC 2013.10)
-boris

Attachment: xen-config.arm64.bad
Description: Text document

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