[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CALCETrWjTpGzJ7bS3p1hU0RPBs9eDg0ixpU2_rYXs6+nBQ1=fA@mail.gmail.com>
Date: Fri, 5 Jul 2019 13:37:31 -0700
From: Andy Lutomirski <luto@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Andrew Cooper <andrew.cooper3@...rix.com>,
LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
Nadav Amit <namit@...are.com>,
Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
Stephane Eranian <eranian@...gle.com>,
Feng Tang <feng.tang@...el.com>,
Andy Lutomirski <luto@...nel.org>,
Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [patch V2 04/25] x86/apic: Make apic_pending_intr_clear() more robust
On Fri, Jul 5, 2019 at 1:25 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> Andrew,
>
> >
> > These can be addressed by setting TPR to 0x10, which will inhibit
>
> Right, that's easy and obvious.
>
This boots:
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 177aa8ef2afa..5257c40bde6c 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1531,11 +1531,14 @@ static void setup_local_APIC(void)
#endif
/*
- * Set Task Priority to 'accept all'. We never change this
- * later on.
+ * Set Task Priority to 'accept all except vectors 0-31'. An APIC
+ * vector in the 16-31 range can be delivered otherwise, but we'll
+ * think it's an exception and terrible things will happen.
+ * We never change this later on.
*/
value = apic_read(APIC_TASKPRI);
value &= ~APIC_TPRI_MASK;
+ value |= 0x10;
apic_write(APIC_TASKPRI, value);
apic_pending_intr_clear();
Powered by blists - more mailing lists