Patch "x86, apic: Handle a bad TSC more gracefully" has been added to the 3.10-stable tree

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

    x86, apic: Handle a bad TSC more gracefully

to the 3.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     x86-apic-handle-a-bad-tsc-more-gracefully.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From b47dcbdc5161d3d5756f430191e2840d9b855492 Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Date: Wed, 15 Oct 2014 10:12:07 -0700
Subject: x86, apic: Handle a bad TSC more gracefully

From: Andy Lutomirski <luto@xxxxxxxxxxxxxx>

commit b47dcbdc5161d3d5756f430191e2840d9b855492 upstream.

If the TSC is unusable or disabled, then this patch fixes:

 - Confusion while trying to clear old APIC interrupts.
 - Division by zero and incorrect programming of the TSC deadline
   timer.

This fixes boot if the CPU has a TSC deadline timer but a missing or
broken TSC.  The failure to boot can be observed with qemu using
-cpu qemu64,-tsc,+tsc-deadline

This also happens to me in nested KVM for unknown reasons.
With this patch, I can boot cleanly (although without a TSC).

Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Bandan Das <bsd@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/e2fa274e498c33988efac0ba8b7e3120f7f92d78.1413393027.git.luto@xxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/x86/kernel/apic/apic.c |    4 ++--
 arch/x86/kernel/tsc.c       |    5 ++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1263,7 +1263,7 @@ void __cpuinit setup_local_APIC(void)
 	unsigned int value, queued;
 	int i, j, acked = 0;
 	unsigned long long tsc = 0, ntsc;
-	long long max_loops = cpu_khz;
+	long long max_loops = cpu_khz ? cpu_khz : 1000000;
 
 	if (cpu_has_tsc)
 		rdtscll(tsc);
@@ -1360,7 +1360,7 @@ void __cpuinit setup_local_APIC(void)
 			break;
 		}
 		if (queued) {
-			if (cpu_has_tsc) {
+			if (cpu_has_tsc && cpu_khz) {
 				rdtscll(ntsc);
 				max_loops = (cpu_khz << 10) - (ntsc - tsc);
 			} else
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -968,14 +968,17 @@ void __init tsc_init(void)
 
 	x86_init.timers.tsc_pre_init();
 
-	if (!cpu_has_tsc)
+	if (!cpu_has_tsc) {
+		setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
 		return;
+	}
 
 	tsc_khz = x86_platform.calibrate_tsc();
 	cpu_khz = tsc_khz;
 
 	if (!tsc_khz) {
 		mark_tsc_unstable("could not calculate TSC khz");
+		setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
 		return;
 	}
 


Patches currently in stable-queue which might be from luto@xxxxxxxxxxxxxx are

queue-3.10/mnt-prevent-pivot_root-from-creating-a-loop-in-the-mount-tree.patch
queue-3.10/x86-apic-handle-a-bad-tsc-more-gracefully.patch
queue-3.10/x86_64-entry-filter-rflags.nt-on-entry-from-userspace.patch
queue-3.10/x86_64-entry-fix-out-of-bounds-read-on-sysenter.patch
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