This is a note to let you know that I've just added the patch titled

x86/platform/uv/BAU: Add APIC idt entry

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: x86-platform-uv-bau-add-apic-idt-entry.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 151ad17fbe5e56afa59709f41980508672c777ce Mon Sep 17 00:00:00 2001

From: Andrew Banman abanman@hpe.com Date: Tue, 27 Mar 2018 17:09:06 -0500 Subject: x86/platform/uv/BAU: Add APIC idt entry

From: Andrew Banman abanman@hpe.com

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@hpe.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Acked-by: Mike Travis mike.travis@hpe.com Cc: Dimitri Sivanich sivanich@hpe.com Cc: Russ Anderson rja@hpe.com Cc: stable@vger.kernel.org Cc: "H. Peter Anvin" hpa@zytor.com Link: https://lkml.kernel.org/r/1522188546-196177-1-git-send-email-abanman@hpe.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- 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 # ifdef CONFIG_IRQ_WORK INTG(IRQ_WORK_VECTOR, irq_work_interrupt), # endif +#ifdef CONFIG_X86_UV + INTG(UV_BAU_MESSAGE, uv_bau_message_intr1), +#endif INTG(SPURIOUS_APIC_VECTOR, spurious_interrupt), INTG(ERROR_APIC_VECTOR, error_interrupt), #endif --- 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;

Patches currently in stable-queue which might be from abanman@hpe.com are

queue-4.15/x86-platform-uv-bau-add-apic-idt-entry.patch