Re: [Linux-stable-mirror] [PATCH v4.4 backport 15/16] powerpc/64s: Wire up cpu_show_meltdown()

On Sun, Feb 04, 2018 at 04:00:09PM +1100, Michael Ellerman wrote:

commit fd6e440f20b1a4304553775fc55938848ff617c9 upstream.

The recent commit 87590ce6e373 ("sysfs/cpu: Add vulnerability folder") added a generic folder and set of files for reporting information on CPU vulnerabilities. One of those was for meltdown:

/sys/devices/system/cpu/vulnerabilities/meltdown

This commit wires up that file for 64-bit Book3S powerpc.

For now we default to "Vulnerable" unless the RFI flush is enabled. That may not actually be true on all hardware, further patches will refine the reporting based on the CPU/platform etc. But for now we default to being pessimists.

Signed-off-by: Michael Ellerman mpe@ellerman.id.au

Also applied to 4.9.y and 4.14.y, thanks.

greg k-h