Messages in this thread | | | Subject | Re: [PATCH v3] powerpc/kernel/sysfs: Export ldbar spr to sysfs | From | Anju T Sudhakar <> | Date | Tue, 13 Mar 2018 11:13:05 +0530 |
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Hi,
On Tuesday 06 March 2018 04:35 PM, Michael Ellerman wrote: > Anju T Sudhakar <anju@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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