Re: [PATCH] x86/microcode/intel: Ensure new microcode processor flags match with cpu's pf

[Zhenzhong Duan]

On 2018/6/19 17:12, Borislav Petkov wrote:

On Tue, Jun 19, 2018 at 12:49:40PM +0800, Zhenzhong Duan wrote:

Imagine kernel already found a microcode blob A with extended sig/pf
matching current cpu, then another microcode B is checked which doesn't
match current cpu...

Do you see the

        if (!microcode_matches(mc_header, uci->cpu_sig.sig)) {

call a couple of lines earlier?

Sure, but it didn't ensure a match in stepping and pf, is that expected?

Thanks
Zhenzhong