Merge branches 'x86/early-printk', 'x86/microcode' and 'core/objtool' into x86/urgent...

[sfrench/cifs-2.6.git] / Documentation / admin-guide / kernel-parameters.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 4c74a2f4ddfc38c3aaf79fa5f6db10bc524dc78e..81d1d5a7472804e50a663480ef92dc67abc71ab5 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1068,7 +1068,7 @@
                        earlyprintk=serial[,0x...[,baudrate]]
                        earlyprintk=ttySn[,baudrate]
                        earlyprintk=dbgp[debugController#]
-                       earlyprintk=pciserial,bus:device.function[,baudrate]
+                       earlyprintk=pciserial[,force],bus:device.function[,baudrate]
                        earlyprintk=xdbc[xhciController#]
 
                        earlyprintk is useful when the kernel crashes before
@@ -1100,6 +1100,10 @@
 
                        The sclp output can only be used on s390.
 
+                       The optional "force" to "pciserial" enables use of a
+                       PCI device even when its classcode is not of the
+                       UART class.
+
        edac_report=    [HW,EDAC] Control how to report EDAC event
                        Format: {"on" | "off" | "force"}
                        on: enable EDAC to report H/W event. May be overridden
@@ -1390,6 +1394,11 @@
        hvc_iucv_allow= [S390]  Comma-separated list of z/VM user IDs.
                                If specified, z/VM IUCV HVC accepts connections
                                from listed z/VM user IDs only.
+
+       hv_nopvspin     [X86,HYPER_V] Disables the paravirt spinlock optimizations
+                                     which allow the hypervisor to 'idle' the
+                                     guest on lock contention.
+
        keep_bootcon    [KNL]
                        Do not unregister boot console at start. This is only
                        useful for debugging when something happens in the window
@@ -1754,12 +1763,24 @@
                nobypass        [PPC/POWERNV]
                        Disable IOMMU bypass, using IOMMU for PCI devices.
 
+       iommu.strict=   [ARM64] Configure TLB invalidation behaviour
+                       Format: { "0" | "1" }
+                       0 - Lazy mode.
+                         Request that DMA unmap operations use deferred
+                         invalidation of hardware TLBs, for increased
+                         throughput at the cost of reduced device isolation.
+                         Will fall back to strict mode if not supported by
+                         the relevant IOMMU driver.
+                       1 - Strict mode (default).
+                         DMA unmap operations invalidate IOMMU hardware TLBs
+                         synchronously.
+
        iommu.passthrough=
                        [ARM64] Configure DMA to bypass the IOMMU by default.
                        Format: { "0" | "1" }
                        0 - Use IOMMU translation for DMA.
                        1 - Bypass the IOMMU for DMA.
-                       unset - Use IOMMU translation for DMA.
+                       unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
 
        io7=            [HW] IO7 for Marvel based alpha systems
                        See comment before marvel_specify_io7 in
@@ -2279,6 +2300,8 @@
        ltpc=           [NET]
                        Format: <io>,<irq>,<dma>
 
+       lsm.debug       [SECURITY] Enable LSM initialization debugging output.
+
        machvec=        [IA-64] Force the use of a particular machine-vector
                        (machvec) in a generic kernel.
                        Example: machvec=hpzx1_swiotlb
@@ -2409,7 +2432,7 @@
                        seconds.  Use this parameter to check at some
                        other rate.  0 disables periodic checking.
 
-       memtest=        [KNL,X86,ARM] Enable memtest
+       memtest=        [KNL,X86,ARM,PPC] Enable memtest
                        Format: <integer>
                        default : 0 <disable>
                        Specifies the number of memtest passes to be
@@ -4616,7 +4639,8 @@
 
        usbcore.old_scheme_first=
                        [USB] Start with the old device initialization
-                       scheme (default 0 = off).
+                       scheme,  applies only to low and full-speed devices
+                        (default 0 = off).
 
        usbcore.usbfs_memory_mb=
                        [USB] Memory limit (in MB) for buffers allocated by
@@ -4831,6 +4855,18 @@
                        This is actually a boot loader parameter; the value is
                        passed to the kernel using a special protocol.
 
+       vm_debug[=options]      [KNL] Available with CONFIG_DEBUG_VM=y.
+                       May slow down system boot speed, especially when
+                       enabled on systems with a large amount of memory.
+                       All options are enabled by default, and this
+                       interface is meant to allow for selectively
+                       enabling or disabling specific virtual memory
+                       debugging features.
+
+                       Available options are:
+                         P     Enable page structure init time poisoning
+                         -     Disable all of the above options
+
        vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact
                        size of <nn>. This can be used to increase the
                        minimum size (128MB on x86). It can also be used to