Hi,

On Tuesday 06 March 2018 04:35 PM, Michael Ellerman wrote:
Anju T Sudhakar <a...@linux.vnet.ibm.com> writes:

diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 4437c70..caefb64 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -757,6 +759,9 @@ static int register_cpu_online(unsigned int cpu)
                        device_create_file(s, &pmc_attrs[i]);
#ifdef CONFIG_PPC64
+       if (cpu_has_feature(CPU_FTR_ARCH_300))
+               device_create_file(s, &dev_attr_ldbar);
Is this register readable in supervisor state?

This is a nice catch, thanks. :)
The guest kernel can not access the register, it is only readable in the hypervisor state. I will resend the patch with a condition check so that this spr will not get registered for guest kernel.


Regards,
Anju

cheers


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