[PATCH 4.15 10/72] x86/platform/uv/BAU: Add APIC idt entry

From: Greg Kroah-Hartman
Date: Fri Apr 06 2018 - 10:08:34 EST

4.15-stable review patch. If anyone has any objections, please let me know.


From: Andrew Banman <abanman@xxxxxxx>

commit 151ad17fbe5e56afa59709f41980508672c777ce upstream.

BAU uses the old alloc_initr_gate90 method to setup its interrupt. This
fails silently as the BAU vector is in the range of APIC vectors that are
registered to the spurious interrupt handler. As a consequence BAU
broadcasts are not handled, and the broadcast source CPU hangs.

Update BAU to use new idt structure.

Fixes: dc20b2d52653 ("x86/idt: Move interrupt gate initialization to IDT code")
Signed-off-by: Andrew Banman <abanman@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Mike Travis <mike.travis@xxxxxxx>
Cc: Dimitri Sivanich <sivanich@xxxxxxx>
Cc: Russ Anderson <rja@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Link: https://lkml.kernel.org/r/1522188546-196177-1-git-send-email-abanman@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

arch/x86/include/asm/hw_irq.h | 1 +
arch/x86/kernel/idt.c | 3 +++
arch/x86/platform/uv/tlb_uv.c | 2 --
3 files changed, 4 insertions(+), 2 deletions(-)

--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -36,6 +36,7 @@ extern asmlinkage void kvm_posted_intr_w
extern asmlinkage void kvm_posted_intr_nested_ipi(void);
extern asmlinkage void error_interrupt(void);
extern asmlinkage void irq_work_interrupt(void);
+extern asmlinkage void uv_bau_message_intr1(void);

extern asmlinkage void spurious_interrupt(void);
extern asmlinkage void thermal_interrupt(void);
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -140,6 +140,9 @@ static const __initconst struct idt_data
INTG(IRQ_WORK_VECTOR, irq_work_interrupt),
# endif
+#ifdef CONFIG_X86_UV
+ INTG(UV_BAU_MESSAGE, uv_bau_message_intr1),
INTG(SPURIOUS_APIC_VECTOR, spurious_interrupt),
INTG(ERROR_APIC_VECTOR, error_interrupt),
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -2254,8 +2254,6 @@ static int __init uv_bau_init(void)
init_uvhub(uvhub, vector, uv_base_pnode);

- alloc_intr_gate(vector, uv_bau_message_intr1);
for_each_possible_blade(uvhub) {
if (uv_blade_nr_possible_cpus(uvhub)) {
unsigned long val;