Re: [Xen-devel] printk from softirq on xen: hard lockup
From: David Vrabel <hidden>
Date: 2015-08-06 16:10:49
Also in:
lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit), xen hypervisor x86 · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, Juergen Gross
On 06/08/15 16:58, Jason A. Donenfeld wrote:
On Thu, Aug 6, 2015 at 12:02 PM, David Vrabel [off-list ref] wrote:quoted
Linux PV guests must use the "Xen PV" APIC driver. You need to investigate why your PV guest is not using this (although I'm surprised it works at all with the wrong one).Actually it appears this PV Guest is using the "flat" APIC driver instead of the Xen APIC driver. But upon further investigation into why: arch/x86/xen/Makefile: obj-$(CONFIG_XEN_DOM0) += apic.o vga.o It would appear that only dom0 gets to use the Xen APIC driver. What gives?
Looks like the Makefile is wrong. Try this: 8<------------------ x86/xen: build "Xen PV" APIC driver for domU as well A PV domU also needs the Xen PV APIC driver but it was only built for CONFIG_XEN_DOM0=y. Signed-off-by: David Vrabel <redacted> Cc: <redacted> --- arch/x86/xen/Makefile | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 7322755..4b6e29a 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile@@ -13,13 +13,13 @@ CFLAGS_mmu.o := $(nostackp) obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \ time.o xen-asm.o xen-asm_$(BITS).o \ grant-table.o suspend.o platform-pci-unplug.o \ - p2m.o + p2m.o apic.o obj-$(CONFIG_EVENT_TRACING) += trace.o obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o -obj-$(CONFIG_XEN_DOM0) += apic.o vga.o +obj-$(CONFIG_XEN_DOM0) += vga.o obj-$(CONFIG_SWIOTLB_XEN) += pci-swiotlb-xen.o obj-$(CONFIG_XEN_EFI) += efi.o
--
2.1.4