OMG, I supposed it will enough to put a line like:
ucode=scan
As soon as I tried a line like:
GRUB_CMDLINE_XEN="ucode=scan"
The system behaviour changed I still have a couple de lines in
/var/log/kern.log saying:
Jul 5 19:38:19 xuxa3 kernel: [ 22.487806] VPMU disabled by hypervisor.
| Jul 5 19:38:19 xuxa3 kernel: [ 22.488166] Performance Events:
unsupported p6 CPU model 79 no PMU driver, software events only.
But this seems another problem because while booting with standard
kernel I got:
Jul 5 14:05:17 xuxa3 kernel: [ 0.837414] Performance Events: PEBS
fmt2+, Broadwell events, full-width counters, Broken BIOS detected,
complain to your hardware vendor.
Jul 5 14:05:17 xuxa3 kernel: [ 0.837427] [Firmware Bug]: the BIOS
has corrupted hw-PMU resources (MSR 38d is 330)
Jul 5 14:05:17 xuxa3 kernel: [ 0.837504] Intel PMU driver.
Jul 5 14:05:17 xuxa3 kernel: [ 0.837508] ... version: 3
Jul 5 14:05:17 xuxa3 kernel: [ 0.837509] ... bit
width: 48
Jul 5 14:05:17 xuxa3 kernel: [ 0.837510] ... generic registers: 8
Jul 5 14:05:17 xuxa3 kernel: [ 0.837511] ... value
mask: 0000ffffffffffff
Jul 5 14:05:17 xuxa3 kernel: [ 0.837512] ... max
period: 00007fffffffffff
Jul 5 14:05:17 xuxa3 kernel: [ 0.837513] ... fixed-purpose events: 3
Jul 5 14:05:17 xuxa3 kernel: [ 0.837514] ... event
mask: 00000007000000ff
I don't know if you could help me with this, but as long I see the
microcode has been loaded and this bugs can be closed Thanks very
much,El lun, 05-07-2021 a las 14:35 +0000, Andy Smith escribió:
> Hello,
>
> On Mon, Jul 05, 2021 at 03:13:17PM +0200, José L. Fernández Jambrina>
wrote:
> > When booting in Xen mode my system doen't load microcode,
>
> It is my understanding that when booting the hypervisor it is the
> hypervisor's job to load microcode, and it won't do so unless you
> have something like:
>
> ucode=scan
>
> in your hypervisor command line, e.g. by putting:
>
> GRUB_CMDLINE_XEN="ucode=scan"
>
> in /etc/default/grub.
>
> Do you have something like that?
>
> That will cause the hypervisor to scan the other boot files (kernel
> and initramfs) for microcode to apply, like the kernel itself would
> otherwise do.
>
> It works for me, anyway.
>
> Cheers,
> Andy
