Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE

[PATCH 0/4] TSX force abort · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-06-09
[PATCH 1/4] x86/msr: Define new bits in TSX_FORCE_ABORT MSR · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-06-09
Re: [PATCH 1/4] x86/msr: Define new bits in TSX_FORCE_ABORT MSR · Borislav Petkov <bp@alien8.de> · 2021-06-11
Re: [PATCH 1/4] x86/msr: Define new bits in TSX_FORCE_ABORT MSR · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-06-11
[PATCH 2/4] perf/x86/intel: Do not deploy workaround when TSX is deprecated · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-06-09
Re: [PATCH 2/4] perf/x86/intel: Do not deploy workaround when TSX is deprecated · Borislav Petkov <bp@alien8.de> · 2021-06-11
Re: [PATCH 2/4] perf/x86/intel: Do not deploy workaround when TSX is deprecated · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-06-11
Re: [PATCH 2/4] perf/x86/intel: Do not deploy workaround when TSX is deprecated · Borislav Petkov <bp@alien8.de> · 2021-06-11
Re: [PATCH 2/4] perf/x86/intel: Do not deploy workaround when TSX is deprecated · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-06-11
[PATCH 3/4] x86/tsx: Clear CPUID bits when TSX always force aborts · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-06-09
Re: [PATCH 3/4] x86/tsx: Clear CPUID bits when TSX always force aborts · Borislav Petkov <bp@alien8.de> · 2021-06-11
Re: [PATCH 3/4] x86/tsx: Clear CPUID bits when TSX always force aborts · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-06-11
[PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-06-09
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Borislav Petkov <bp@alien8.de> · 2021-06-11
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-06-11
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Eduardo Habkost <hidden> · 2021-07-06
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Paolo Bonzini <pbonzini@redhat.com> · 2021-07-06
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Eduardo Habkost <hidden> · 2021-07-06
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Paolo Bonzini <pbonzini@redhat.com> · 2021-07-06
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Eduardo Habkost <hidden> · 2021-07-07
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Jim Mattson <hidden> · 2021-07-07
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Eduardo Habkost <hidden> · 2021-07-07
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Jim Mattson <hidden> · 2021-07-07
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Eduardo Habkost <hidden> · 2021-07-07
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Paolo Bonzini <pbonzini@redhat.com> · 2021-07-08
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-07-06
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Eduardo Habkost <hidden> · 2021-07-06
Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE · Pawan Gupta <pawan.kumar.gupta@linux.intel.com> · 2021-07-06

From: Borislav Petkov <bp@alien8.de>
Date: 2021-06-11 10:09:13
Also in: linux-doc, lkml

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.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

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