From: Peter Zijlstra <peterz@infradead.org>
To: Don Zickus <dzickus@redhat.com>
Cc: Jason Wessel <jason.wessel@windriver.com>,
Ingo Molnar <mingo@elte.hu>,
Robert Richter <robert.richter@amd.com>,
ying.huang@intel.com, Andi Kleen <andi@firstfloor.org>,
LKML <linux-kernel@vger.kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [V2 PATCH 0/6] x86, NMI: give NMI handler a face-lift
Date: Fri, 19 Nov 2010 19:25:58 +0100 [thread overview]
Message-ID: <1290191158.2109.1614.camel@laptop> (raw)
In-Reply-To: <20101119165952.GJ18100@redhat.com>
On Fri, 2010-11-19 at 11:59 -0500, Don Zickus wrote:
> Reading the kvm code in arch/x86/kernel/kvm/x86.c, it seems like they do
> _not_ fault on writes, only on some (which don't include a bunch of the
> perfctrs). The reason seems to be to prevent older distros from falling
> apart that could not handle those faults properly.
Egads, that's just vile.. in that case we don't really need to do
anything, its a qemu/KVM bug, they emulate non-working hardware.
Hmm,. there is something we can do though, write a non-zero counter
value and then read it back, if its not what we wrote, its fudged and we
disable the pmu.
next prev parent reply other threads:[~2010-11-19 18:25 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-12 14:43 [V2 PATCH 0/6] x86, NMI: give NMI handler a face-lift Don Zickus
2010-11-12 14:43 ` [PATCH 1/6] x86, NMI: Add NMI symbol constants and rename memory parity to PCI SERR Don Zickus
2010-11-12 14:43 ` [PATCH 2/6] x86, NMI: Add touch_nmi_watchdog to io_check_error delay Don Zickus
2010-11-12 14:43 ` [PATCH 3/6] x86, NMI: Rewrite NMI handler Don Zickus
2010-11-12 14:43 ` [PATCH 4/6] x86, NMI: Remove DIE_NMI_IPI and add priorties to handlers Don Zickus
2010-11-12 14:43 ` [PATCH 5/6] x86, NMI: Allow NMI reason io port (0x61) to be processed on any CPU Don Zickus
2010-11-12 14:43 ` [PATCH 6/6] x86, NMI: Remove do_nmi_callback logic Don Zickus
2010-11-12 15:05 ` [V2 PATCH 0/6] x86, NMI: give NMI handler a face-lift Jason Wessel
2010-11-12 15:42 ` Don Zickus
2010-11-12 15:55 ` Jason Wessel
2010-11-12 16:11 ` Don Zickus
2010-11-12 16:34 ` Jason Wessel
2010-11-12 17:27 ` Don Zickus
2010-11-16 18:43 ` Don Zickus
2010-11-16 20:04 ` Jason Wessel
2010-11-18 8:05 ` Ingo Molnar
2010-11-18 12:47 ` Jason Wessel
2010-11-18 13:17 ` Peter Zijlstra
2010-11-18 14:32 ` Don Zickus
2010-11-18 15:18 ` Jason Wessel
2010-11-18 15:38 ` Peter Zijlstra
2010-11-18 19:32 ` Don Zickus
2010-11-18 19:51 ` Jason Wessel
2010-11-18 20:04 ` Peter Zijlstra
2010-11-18 20:08 ` Don Zickus
2010-11-18 20:11 ` Cyrill Gorcunov
2010-11-18 20:52 ` Don Zickus
2010-11-18 21:01 ` Cyrill Gorcunov
2010-11-18 21:16 ` Don Zickus
2010-11-18 21:26 ` Cyrill Gorcunov
2010-11-18 20:28 ` Cyrill Gorcunov
2010-11-18 20:39 ` Cyrill Gorcunov
2010-11-18 21:02 ` Don Zickus
2010-11-18 21:19 ` Cyrill Gorcunov
2010-11-18 20:30 ` Peter Zijlstra
2010-11-19 16:59 ` Don Zickus
2010-11-19 18:25 ` Peter Zijlstra [this message]
2010-11-19 22:59 ` Don Zickus
2010-11-19 23:09 ` Peter Zijlstra
2010-11-19 23:30 ` Jason Wessel
2010-11-22 14:22 ` Don Zickus
2010-11-22 14:22 ` Don Zickus
2010-11-22 14:29 ` Peter Zijlstra
2010-11-18 20:04 ` Cyrill Gorcunov
2010-11-18 21:56 ` Cyrill Gorcunov
2010-11-18 21:58 ` Cyrill Gorcunov
2010-11-18 22:15 ` Cyrill Gorcunov
2010-11-18 22:24 ` Jason Wessel
2010-11-18 22:27 ` Cyrill Gorcunov
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