From: Kyle Huey <me@kylehuey.com>
To: xen-devel@lists.xen.org
Cc: Andrew Cooper <andrew.cooper3@citrix.com>,
Kevin Tian <kevin.tian@intel.com>,
Jun Nakajima <jun.nakajima@intel.com>,
Jan Beulich <JBeulich@suse.com>,
Robert O'Callahan <robert@ocallahan.org>
Subject: [PATCH v5] x86/Intel: virtualize support for cpuid faulting
Date: Thu, 20 Oct 2016 06:44:26 -0700 [thread overview]
Message-ID: <20161020134428.28705-1-khuey@kylehuey.com> (raw)
rr (http://rr-project.org/), a Linux userspace record-and-replay reverse-
execution debugger, would like to trap and emulate the CPUID instruction.
This would allow us to a) mask away certain hardware features that rr does
not support (e.g. RDRAND) and b) enable trace portability across machines
by providing constant results. Patches for support in the Linux kernel are in
flight, and we'd like to be able to use this feature on virtualized Linux
instances as well.
Changes since v4:
- Renamed cpuid_fault to cpuid_faulting across the patch.
- Various style nits.
- Added Reviewed-by Kevin Tian.
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next reply other threads:[~2016-10-20 13:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-20 13:44 Kyle Huey [this message]
2016-10-20 13:44 ` [PATCH v5 1/2] x86/Intel: Expose cpuid_faulting_enabled so it can be used elsewhere Kyle Huey
2016-10-20 13:44 ` [PATCH v5 2/2] x86/Intel: virtualize support for cpuid faulting Kyle Huey
2016-10-20 14:04 ` Andrew Cooper
2016-10-20 14:15 ` [PATCH v5] " Wei Liu
2016-10-20 16:19 ` Andrew Cooper
2016-10-21 15:51 ` Kyle Huey
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