Messages in this thread | | | Subject | Re: [RFC Part1 PATCH v3 02/17] x86/CPU/AMD: Add the Secure Encrypted Virtualization CPU feature | From | Tom Lendacky <> | Date | Tue, 25 Jul 2017 10:29:40 -0500 |
| |
On 7/25/2017 10:13 AM, Borislav Petkov wrote: > On Tue, Jul 25, 2017 at 09:58:54AM -0500, Tom Lendacky wrote: >> True, but it is more about being accurate and making sure the value is >> correct where ever it may be used. > > So early_identify_cpu() initializes phys_bits to 32 on 32-bit. > Subtracting it there would actually make actively it wrong, AFAICT.
But early_identify_cpu() calls get_cpu_cap() which will check for cpuid leaf 0x80000008 support and set x86_phys_bits. I'll try to build and run a 32-bit kernel and see how this all flows.
Thanks, Tom
>
| |