diff options
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 747a55abf494..e019db1633fd 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2606,6 +2606,11 @@ for it. Intended to get systems with badly broken firmware running. + irqhandler.duration_warn_us= [KNL] + Warn if an IRQ handler exceeds the specified duration + threshold in microseconds. Useful for identifying + long-running IRQs in the system. + irqpoll [HW] When an interrupt is not handled search all handlers for it. Also check all handlers each timer @@ -3767,8 +3772,16 @@ mga= [HW,DRM] - microcode.force_minrev= [X86] - Format: <bool> + microcode= [X86] Control the behavior of the microcode loader. + Available options, comma separated: + + base_rev=X - with <X> with format: <u32> + Set the base microcode revision of each thread when in + debug mode. + + dis_ucode_ldr: disable the microcode loader + + force_minrev: Enable or disable the microcode minimal revision enforcement for the runtime microcode loader. @@ -3829,6 +3842,7 @@ srbds=off [X86,INTEL] ssbd=force-off [ARM64] tsx_async_abort=off [X86] + vmscape=off [X86] Exceptions: This does not have any effect on @@ -6154,7 +6168,7 @@ rdt= [HW,X86,RDT] Turn on/off individual RDT features. List is: cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp, - mba, smba, bmec. + mba, smba, bmec, abmc. E.g. to turn on cmt and turn off mba use: rdt=cmt,!mba @@ -6405,8 +6419,9 @@ rodata= [KNL,EARLY] on Mark read-only kernel memory as read-only (default). off Leave read-only kernel memory writable for debugging. - full Mark read-only kernel memory and aliases as read-only - [arm64] + noalias Mark read-only kernel memory as read-only but retain + writable aliases in the direct map for regions outside + of the kernel image. [arm64] rockchip.usb_uart [EARLY] @@ -6428,6 +6443,9 @@ rootflags= [KNL] Set root filesystem mount option string + initramfs_options= [KNL] + Specify mount options for for the initramfs mount. + rootfstype= [KNL] Set root filesystem type rootwait [KNL] Wait (indefinitely) for root device to show up. @@ -8041,6 +8059,16 @@ vmpoff= [KNL,S390] Perform z/VM CP command after power off. Format: <command> + vmscape= [X86] Controls mitigation for VMscape attacks. + VMscape attacks can leak information from a userspace + hypervisor to a guest via speculative side-channels. + + off - disable the mitigation + ibpb - use Indirect Branch Prediction Barrier + (IBPB) mitigation (default) + force - force vulnerability detection even on + unaffected processors + vsyscall= [X86-64,EARLY] Controls the behavior of vsyscalls (i.e. calls to fixed addresses of 0xffffffffff600x00 from legacy |