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SubjectRe: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE
On 06.07.2021 15:52, Eduardo Habkost 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.
>
>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

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