Re: [PATCH 0/2] xen: Fix PV-only build
Jason Andryuk <[email protected]>
| Newsgroups | org.xenproject.lists.xen-devel,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
On 2026-08-06 09:31, Juergen Gross wrote: > On 06.08.26 15:24, Jason Andryuk wrote: >> On 2026-08-06 08:00, Jürgen Groß wrote: >>> On 06.08.26 13:31, Jan Beulich wrote: >>>> On 06.08.2026 12:55, Juergen Gross wrote: >>>>> On 06.08.26 03:52, Jason Andryuk wrote: >>>>>> Allow disabling XEN_PVHVM for a PV-only. A stub in the event channel >>>>>> code needs to be fixed first. >>>>>> >>>>>> Jason Andryuk (2): >>>>>> xen/events: Fix xen_set_upcall_vector stub >>>>>> xen/Kconfig: select XEN_PVHVM >>>>>> >>>>>> arch/x86/xen/Kconfig | 8 +++++--- >>>>>> drivers/xen/events/events_base.c | 2 +- >>>>>> 2 files changed, 6 insertions(+), 4 deletions(-) >>>>>> >>>>> >>>>> I did a comparison of a kernel built with your patches disabling >>>>> XEN_PVHVM >>>>> and my patches with XEN_PVHVM_GUEST disabled. >>>>> >>>>> The kernel built with my patches is 6 bytes smaller than the one >>>>> with your >>>>> patches. >>>> >>>> Isn't this a sign of something else needing tweaking, somewhere? >>> >>> This is a sign that there are probably only very few really HVM >>> specific paths >>> (in the sense of: explicitly not marked as irrelevant for PV) in the >>> kernel. >>> Yes, I'm sure you can find some more, but I'm really not sure this is >>> relevant >>> for more than a handful of users. >> >> I see more reduction: >> 15029248 - arch/x86/boot/bzImage >> 15021056 - arch/x86/boot/bzImage.after >> >> ~8k >> >> 52542480 - vmlinux >> 52523184 - vmlinux.after >> >> ~18k >> >> $ ../linux/scripts/bloat-o-meter vmlinux vmlinux.after >> add/remove: 1/136 grow/shrink: 14/48 up/down: 15902/-22430 (-6528) > > Did you disable CONFIG_XEN_PVHVM_GUEST in the before kernel, too? Yes $ grep PVHVM config-before config-after config-pvh-before:CONFIG_XEN_PVHVM=y config-pvh-before:CONFIG_XEN_PVHVM_SMP=y config-pvh-before:# CONFIG_XEN_PVHVM_GUEST is not set config-pvh-after:# CONFIG_XEN_PVHVM_GUEST is not set These three options change: $ diff -u config-before config-after -CONFIG_XEN_PVHVM=y -CONFIG_XEN_PVHVM_SMP=y -CONFIG_XEN_AUTO_XLATE=y Regards, Jason