diff options
| author | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-16 21:20:05 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-16 20:09:36 +0100 |
| commit | 1e8014e74b141979f0cf65bfabe9a077879b11a1 (patch) | |
| tree | d9b772df4ab2d888a60d5a1f3aba6484507a4c3d /arch | |
| parent | 95e4f102222aea0c9ff89a5a04c44612d9e400e8 (diff) | |
powerpc/64s: Wire up cpu_show_meltdown()
commit fd6e440f20b1a4304553775fc55938848ff617c9 upstream.
The recent commit 87590ce6e373 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/Kconfig | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/setup_64.c | 8 |
2 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 0c26025e18f9..58a1fa979655 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -136,6 +136,7 @@ config PPC select GENERIC_SMP_IDLE_THREAD select GENERIC_CMOS_UPDATE select GENERIC_TIME_VSYSCALL_OLD + select GENERIC_CPU_VULNERABILITIES if PPC_BOOK3S_64 select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS_BROADCAST if SMP select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 7db464c2b129..cd7bfec17654 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -934,5 +934,13 @@ 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 */ #endif |