Messages in this thread | | | Subject | Re: [RFC PATCH] xen: get correct nr_irqs_gsi value from hypervisor | From | Lin Ming <> | Date | Tue, 10 Apr 2012 23:16:35 +0800 |
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On Tue, 2012-04-10 at 22:57 +0800, Lin Ming wrote: > nr_irqs_gsi is set in probe_nr_irqs_gsi() > nr_irqs_gsi = gsi_top + NR_IRQS_LEGACY; > > gsi_top is set in mp_register_ioapic() > gsi_top = gsi_cfg->gsi_end + 1; > > mp_register_ioapic() calls io_apic_read, which don't have a Xen specific > version. Actually, io_apic_read() always return -1 on Xen Dom0 kernel. > > So currently, nr_irqs_gsi is always wrong on Xen Dom0 kernel. > > This patch gets the correct nr_irqs_gsi value from Xen hypervisor with a > hypercall. > > Signed-off-by: Lin Ming <mlin@ss.pku.edu.cn> > -- > arch/x86/include/asm/io_apic.h | 2 ++ > arch/x86/kernel/apic/io_apic.c | 2 +- > arch/x86/xen/setup.c | 9 +++++++++ > include/xen/interface/physdev.h | 6 ++++++ > 4 files changed, 18 insertions(+), 1 deletions(-) > > (I will send xen hypervisor patch in another mail)\
Here is xen hypervisor side patch:
[RFC PATCH] x86: Add a new physdev_op PHYSDEVOP_nr_irqs_gsi http://marc.info/?l=xen-devel&m=133407101003891&w=2
Regards, Lin Ming
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