Thanks for everyone's comments. I understand now.
Cheers,
James Harrison
On Friday, 7 February 2014, 15:32, Neil Horman <nhorman(a)redhat.com> wrote:
On Fri, Feb 07, 2014 at 03:01:15PM +0000, James Harrison wrote:
Hi.
Thanks for the quick reply.
So what architecture does Red Hat compile its kernels for? Having compiled the Linux
Kernel, you must specify target architecture. Is there now a "general cpu"
option?
Yes, again, look at arch/x86/Kconfig[.cpu]. There is a generic option for
x86_64 arches.
For specific CPU features like virtualisation flags, how do kernels
know to report the correct CPU features? Is there a Red Hat patch?
What? You have this backwards. the kernel doesn't assert virtualization
flags
(or other feature flags) on a cpu, the kernel retrieves them from the cpu, and
make code path decisions based on that information. Specifically the kernel
uses the cpuid instruction to fetch cpu flags so the kernel knows what features
it can support.
Neil
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