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Commit ff348355 authored by Michael Ellerman's avatar Michael Ellerman
Browse files

powerpc/64s: Enhance the information in cpu_show_meltdown() 



Now that we have the security feature flags we can make the
information displayed in the "meltdown" file more informative.

Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 8ad33041

arch/powerpc/include/asm/security_features.h

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 




extern unsigned long powerpc_security_features;

extern bool rfi_flush;



static inline void security_ftr_set(unsigned long feature)

{

arch/powerpc/kernel/security.c

+28 −2
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 


#include <linux/kernel.h>

#include <linux/device.h>

#include <linux/seq_buf.h>



#include <asm/security_features.h>
@@ -19,8 +20,33 @@ unsigned long powerpc_security_features __read_mostly = \ 


ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf)

{

	bool thread_priv;



	thread_priv = security_ftr_enabled(SEC_FTR_L1D_THREAD_PRIV);



	if (rfi_flush || thread_priv) {

		struct seq_buf s;

		seq_buf_init(&s, buf, PAGE_SIZE - 1);



		seq_buf_printf(&s, "Mitigation: ");



		if (rfi_flush)

		return sprintf(buf, "Mitigation: RFI Flush\n");

			seq_buf_printf(&s, "RFI Flush");



		if (rfi_flush && thread_priv)

			seq_buf_printf(&s, ", ");



		if (thread_priv)

			seq_buf_printf(&s, "L1D private per thread");



		seq_buf_printf(&s, "\n");



		return s.len;

	}



	if (!security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) &&

	    !security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR))

		return sprintf(buf, "Not affected\n");



	return sprintf(buf, "Vulnerable\n");

}