[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] Pentium Pro Feature Bugs
|
From: |
tedheadster |
|
Subject: |
Re: [Qemu-devel] Pentium Pro Feature Bugs |
|
Date: |
Fri, 17 May 2019 16:06:20 -0400 |
On Fri, May 17, 2019 at 2:15 PM Eduardo Habkost <address@hidden> wrote:
> Are you running the same kernel version on all VMs?
> X86_FEATURE_CPUID was added in Linux v4.11.
>
Eduardo,
I am running a 4.9.162 virtual machine (very intentionally, the
drivers I need got broken in 4.11) inside of a 5.1.2 host.
X86_FEATURE_CPUID is certainly defined in
arch/x86/kernel/cpu/capflags.c but nothing much seems to be done with
it.
The whole reason this came up is I was running 'perf top' on the
virtual host and it was spending the most kernel time calling cpuid(),
which seemed wrong.
- Matthew