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Commit fd6e440f authored by Michael Ellerman's avatar Michael Ellerman
Browse files

powerpc/64s: Wire up cpu_show_meltdown() 



The recent commit 87590ce6 ("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: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 349524bc

arch/powerpc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -166,6 +166,7 @@ config PPC 
	select GENERIC_CLOCKEVENTS_BROADCAST	if SMP

	select GENERIC_CMOS_UPDATE

	select GENERIC_CPU_AUTOPROBE

	select GENERIC_CPU_VULNERABILITIES	if PPC_BOOK3S_64

	select GENERIC_IRQ_SHOW

	select GENERIC_IRQ_SHOW_LEVEL

	select GENERIC_SMP_IDLE_THREAD

arch/powerpc/kernel/setup_64.c

+8 −0
Original line number Diff line number Diff line
@@ -901,4 +901,12 @@ void __init setup_rfi_flush(enum l1d_flush_type types, bool enable) 
	if (!no_rfi_flush)

		rfi_flush_enable(enable);

}



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

{

	if (rfi_flush)

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



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

}

#endif /* CONFIG_PPC_BOOK3S_64 */