Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE
From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Date: 2021-07-06 21:15:38
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On 06.07.2021 15:52, Eduardo Habkost wrote:
On Wed, Jun 09, 2021 at 02:14:39PM -0700, Pawan Gupta wrote:quoted
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.Why is a global option necessary to allow those guests to be resumed? Why can't KVM_GET_SUPPORTED_CPUID always return the HLE and RTM bits as supported when the host CPU has them?
Yes, the global option is unnecessary and this patch was dropped in v2. Thanks, Pawan