2018-02-26 19:16 GMT+08:00 Borislav Petkov <bp@xxxxxxxxx>: > On Mon, Feb 26, 2018 at 07:02:29PM +0800, Wanpeng Li wrote: >> > So a guest will have *two* microcode revisions - both of which are most >> > likely wrong?! >> >> Just one revision. > > So what does "the non-sensical value which is written by the guest will > not reflect to guest-visible microcode revision" even mean then? > > cat /proc/cpuinfo > > in the guest shows what exactly? > > And what would RDMSR 0x8b show then? Both are the same values set by kvm userspace. > >> https://lkml.org/lkml/2017/12/9/29 The original discussion explain in >> more details. > > approach. Instead, the kernel should not look at microcode revisions if > it runs virtualized. This is correct. The link explains why the userspace sets microcode revision is still needed. Regards, Wanpeng Li
