From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Jonathan Corbet <corbet@lwn.net>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Randy Dunlap <rdunlap@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Maciej W. Rozycki" <macro@orcam.me.uk>,
Viresh Kumar <viresh.kumar@linaro.org>,
Vlastimil Babka <vbabka@suse.cz>, Tony Luck <tony.luck@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Kyung Min Park <kyung.min.park@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Juergen Gross <jgross@suse.com>,
Krish Sadhukhan <krish.sadhukhan@oracle.com>,
Kan Liang <kan.liang@linux.intel.com>,
Joerg Roedel <jroedel@suse.de>,
Victor Ding <victording@google.com>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
Brijesh Singh <brijesh.singh@amd.com>,
Dave Hansen <dave.hansen@intel.com>,
Mike Rapoport <rppt@kernel.org>,
Anthony Steinhauser <asteinhauser@google.com>,
Anand K Mistry <amistry@google.com>,
Andi Kleen <ak@linux.intel.com>, Miguel Ojeda <ojeda@kernel.org>,
Joe Perches <joe@perches.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-perf-users@vger.kernel.org
Subject: Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE
Date: Fri, 11 Jun 2021 14:37:32 -0700 [thread overview]
Message-ID: <20210611213732.wdriyvmrkcu32fv7@gupta-dev2.localdomain> (raw)
In-Reply-To: <YMM1wUjg/REXCkQQ@zn.tnic>
On 11.06.2021 12:06, Borislav Petkov wrote:
>On Wed, Jun 09, 2021 at 02:14:39PM -0700, Pawan Gupta wrote:
>> On CPUs that deprecated TSX, clearing the enumeration bits CPUID.RTM and
>> CPUID.HLE may not be desirable in some corner cases. Like a saved guest
>> would refuse to resume if it was saved before the microcode update
>> that deprecated TSX.
>
>That corner case needs a lot more justification. Otherwise this is just
>silly.
Agree, chances of hitting the save/resume guest condition described
above is low. I am okay with dropping this patch.
Thanks,
Pawan
next prev parent reply other threads:[~2021-06-11 21:37 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-09 20:57 [PATCH 0/4] TSX force abort Pawan Gupta
2021-06-09 20:58 ` [PATCH 1/4] x86/msr: Define new bits in TSX_FORCE_ABORT MSR Pawan Gupta
2021-06-11 8:39 ` Borislav Petkov
2021-06-11 21:31 ` Pawan Gupta
2021-06-09 21:12 ` [PATCH 2/4] perf/x86/intel: Do not deploy workaround when TSX is deprecated Pawan Gupta
2021-06-11 7:50 ` Borislav Petkov
2021-06-11 21:34 ` Pawan Gupta
2021-06-11 22:01 ` Borislav Petkov
2021-06-11 23:21 ` Pawan Gupta
2021-06-09 21:13 ` [PATCH 3/4] x86/tsx: Clear CPUID bits when TSX always force aborts Pawan Gupta
2021-06-11 10:03 ` Borislav Petkov
2021-06-11 21:36 ` Pawan Gupta
2021-06-09 21:14 ` [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE Pawan Gupta
2021-06-11 10:06 ` Borislav Petkov
2021-06-11 21:37 ` Pawan Gupta [this message]
2021-07-06 19:52 ` Eduardo Habkost
2021-07-06 21:05 ` Paolo Bonzini
2021-07-06 21:33 ` Eduardo Habkost
2021-07-06 21:58 ` Paolo Bonzini
2021-07-07 15:08 ` Eduardo Habkost
2021-07-07 16:42 ` Jim Mattson
2021-07-07 17:08 ` Eduardo Habkost
2021-07-07 17:15 ` Jim Mattson
2021-07-07 18:23 ` Eduardo Habkost
2021-07-08 9:15 ` Paolo Bonzini
2021-07-06 21:16 ` Pawan Gupta
2021-07-06 21:19 ` Eduardo Habkost
2021-07-06 22:51 ` Pawan Gupta
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