powerpc/64s: Wire up cpu_show_meltdown() (fd6e440f) · Commits · 戴 / test

The recent commit ("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>

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 */

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