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Date: Thu, 6 Aug 2015 18:37:05 +0200 From: "Jason A. Donenfeld" <Jason@...c4.com> To: David Vrabel <david.vrabel@...rix.com>, Ian Campbell <ian.campbell@...rix.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, xen-devel@...ts.xen.org Cc: "Jason A. Donenfeld" <Jason@...c4.com>, <stable@...r.kernel.org> Subject: [PATCH v2] xen-apic: Enable on domU as well It turns out that domU also requires the Xen APIC driver. Otherwise we get stuck in busy loops that never exit, such as in this stack trace: (gdb) target remote localhost:9999 Remote debugging using localhost:9999 __xapic_wait_icr_idle () at ./arch/x86/include/asm/ipi.h:56 56 while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY) (gdb) bt #0 __xapic_wait_icr_idle () at ./arch/x86/include/asm/ipi.h:56 #1 __default_send_IPI_shortcut (shortcut=<optimized out>, dest=<optimized out>, vector=<optimized out>) at ./arch/x86/include/asm/ipi.h:75 #2 apic_send_IPI_self (vector=246) at arch/x86/kernel/apic/probe_64.c:54 #3 0xffffffff81011336 in arch_irq_work_raise () at arch/x86/kernel/irq_work.c:47 #4 0xffffffff8114990c in irq_work_queue (work=0xffff88000fc0e400) at kernel/irq_work.c:100 #5 0xffffffff8110c29d in wake_up_klogd () at kernel/printk/printk.c:2633 #6 0xffffffff8110ca60 in vprintk_emit (facility=0, level=<optimized out>, dict=0x0 <irq_stack_union>, dictlen=<optimized out>, fmt=<optimized out>, args=<optimized out>) at kernel/printk/printk.c:1778 #7 0xffffffff816010c8 in printk (fmt=<optimized out>) at kernel/printk/printk.c:1868 #8 0xffffffffc00013ea in ?? () #9 0x0000000000000000 in ?? () Mailing-list-thread: https://lkml.org/lkml/2015/8/4/755 Signed-off-by: Jason A. Donenfeld <Jason@...c4.com> Cc: David Vrabel <david.vrabel@...rix.com> Cc: Ian Campbell <ian.campbell@...rix.com> Cc: <stable@...r.kernel.org> --- arch/x86/xen/Makefile | 4 ++-- arch/x86/xen/xen-ops.h | 11 ++++------- 2 files changed, 6 insertions(+), 9 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 diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index c20fe29..cd248ff 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -98,20 +98,17 @@ static inline void xen_uninit_lock_cpu(int cpu) #endif struct dom0_vga_console_info; - #ifdef CONFIG_XEN_DOM0 void __init xen_init_vga(const struct dom0_vga_console_info *, size_t size); -void __init xen_init_apic(void); #else -static inline void __init xen_init_vga(const struct dom0_vga_console_info *info, - size_t size) -{ -} -static inline void __init xen_init_apic(void) +void __init xen_init_vga(const struct dom0_vga_console_info *info, + size_t size); { } #endif +void __init xen_init_apic(void); + #ifdef CONFIG_XEN_EFI extern void xen_efi_init(void); #else -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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