Re: [RFC Part1 PATCH v3 02/17] x86/CPU/AMD: Add the Secure Encrypted Virtualization CPU feature

On Tue, Jul 25, 2017 at 10:29:40AM -0500, Tom Lendacky wrote: > But early_identify_cpu() calls get_cpu_cap() which will check for cpuid > leaf 0x8008 support and set x86_phys_bits. Right, but it can't be less than 32, can it? And if it is more than 32 bits, then it probably doesn't really

Re: [RFC Part1 PATCH v3 02/17] x86/CPU/AMD: Add the Secure Encrypted Virtualization CPU feature

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,

[RFC Part1 PATCH v3 02/17] x86/CPU/AMD: Add the Secure Encrypted Virtualization CPU feature

From: Tom Lendacky Update the CPU features to include identifying and reporting on the Secure Encrypted Virtualization (SEV) feature. SME is identified by CPUID 0x801f, but requires BIOS support to enable it (set bit 23 of MSR_K8_SYSCFG and set bit 0 of