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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/Documentation/admin-guide/kernel-parameters.txt
....@@ -894,10 +894,6 @@
894894 
895895 	debugpat	[X86] Enable PAT debugging
896896 
897
-	decnet.addr=	[HW,NET]
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-			Format: <area>[,<node>]
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-			See also Documentation/networking/decnet.rst.
900
-
901897 	default_hugepagesz=
902898 			[HW] The size of the default HugeTLB page. This is
903899 			the size represented by the legacy /proc/ hugepages
....@@ -1487,6 +1483,26 @@
14871483 	gart_fix_e820=	[X86-64] disable the fix e820 for K8 GART
14881484 			Format: off | on
14891485 			default: on
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+
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+	gather_data_sampling=
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+			[X86,INTEL] Control the Gather Data Sampling (GDS)
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+			mitigation.
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+
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+			Gather Data Sampling is a hardware vulnerability which
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+			allows unprivileged speculative access to data which was
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+			previously stored in vector registers.
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+
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+			This issue is mitigated by default in updated microcode.
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+			The mitigation may have a performance impact but can be
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+			disabled. On systems without the microcode mitigation
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+			disabling AVX serves as a mitigation.
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+
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+			force:	Disable AVX to mitigate systems without
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+				microcode mitigation. No effect if the microcode
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+				mitigation is present. Known to cause crashes in
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+				userspace with buggy AVX enumeration.
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+
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+			off:    Disable GDS mitigation.
14901506 
14911507 	gcov_persist=	[GCOV] When non-zero (default), profiling data for
14921508 			kernel modules is saved and remains accessible via
....@@ -2144,24 +2160,57 @@
21442160 
21452161 	ivrs_ioapic	[HW,X86-64]
21462162 			Provide an override to the IOAPIC-ID<->DEVICE-ID
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-			mapping provided in the IVRS ACPI table. For
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-			example, to map IOAPIC-ID decimal 10 to
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-			PCI device 00:14.0 write the parameter as:
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+			mapping provided in the IVRS ACPI table.
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+			By default, PCI segment is 0, and can be omitted.
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+
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+			For example, to map IOAPIC-ID decimal 10 to
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+			PCI segment 0x1 and PCI device 00:14.0,
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+			write the parameter as:
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+				ivrs_ioapic=10@0001:00:14.0
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+
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+			Deprecated formats:
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+			* To map IOAPIC-ID decimal 10 to PCI device 00:14.0
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+			  write the parameter as:
21502174 				ivrs_ioapic[10]=00:14.0
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+			* To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
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+			  PCI device 00:14.0 write the parameter as:
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+				ivrs_ioapic[10]=0001:00:14.0
21512178 
21522179 	ivrs_hpet	[HW,X86-64]
21532180 			Provide an override to the HPET-ID<->DEVICE-ID
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-			mapping provided in the IVRS ACPI table. For
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-			example, to map HPET-ID decimal 0 to
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-			PCI device 00:14.0 write the parameter as:
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+			mapping provided in the IVRS ACPI table.
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+			By default, PCI segment is 0, and can be omitted.
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+
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+			For example, to map HPET-ID decimal 10 to
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+			PCI segment 0x1 and PCI device 00:14.0,
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+			write the parameter as:
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+				ivrs_hpet=10@0001:00:14.0
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+
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+			Deprecated formats:
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+			* To map HPET-ID decimal 0 to PCI device 00:14.0
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+			  write the parameter as:
21572192 				ivrs_hpet[0]=00:14.0
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+			* To map HPET-ID decimal 10 to PCI segment 0x1 and
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+			  PCI device 00:14.0 write the parameter as:
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+				ivrs_ioapic[10]=0001:00:14.0
21582196 
21592197 	ivrs_acpihid	[HW,X86-64]
21602198 			Provide an override to the ACPI-HID:UID<->DEVICE-ID
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-			mapping provided in the IVRS ACPI table. For
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-			example, to map UART-HID:UID AMD0020:0 to
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-			PCI device 00:14.5 write the parameter as:
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+			mapping provided in the IVRS ACPI table.
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+			By default, PCI segment is 0, and can be omitted.
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+
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+			For example, to map UART-HID:UID AMD0020:0 to
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+			PCI segment 0x1 and PCI device ID 00:14.5,
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+			write the parameter as:
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+				ivrs_acpihid=AMD0020:0@0001:00:14.5
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+
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+			Deprecated formats:
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+			* To map UART-HID:UID AMD0020:0 to PCI segment is 0,
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+			  PCI device ID 00:14.5, write the parameter as:
21642210 				ivrs_acpihid[00:14.5]=AMD0020:0
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+			* To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
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+			  PCI device ID 00:14.5, write the parameter as:
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+				ivrs_acpihid[0001:00:14.5]=AMD0020:0
21652214 
21662215 	js=		[HW,JOY] Analog joystick
21672216 			See Documentation/input/joydev/joystick.rst.
....@@ -2310,6 +2359,8 @@
23102359 
23112360 	kvm-arm.mode=
23122361 			[KVM,ARM] Select one of KVM/arm64's modes of operation.
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+
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+			none: Forcefully disable KVM.
23132364 
23142365 			nvhe: Standard nVHE-based mode, without support for
23152366 			      protected guests.
....@@ -2918,22 +2969,23 @@
29182969 				Disable all optional CPU mitigations.  This
29192970 				improves system performance, but it may also
29202971 				expose users to several CPU vulnerabilities.
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-				Equivalent to: nopti [X86,PPC]
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+				Equivalent to: gather_data_sampling=off [X86]
29222973 					       kpti=0 [ARM64]
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-					       nospectre_v1 [X86,PPC]
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-					       nobp=0 [S390]
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-					       nospectre_v2 [X86,PPC,S390,ARM64]
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-					       spectre_v2_user=off [X86]
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-					       spec_store_bypass_disable=off [X86,PPC]
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-					       ssbd=force-off [ARM64]
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+					       kvm.nx_huge_pages=off [X86]
29292975 					       l1tf=off [X86]
29302976 					       mds=off [X86]
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-					       tsx_async_abort=off [X86]
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-					       kvm.nx_huge_pages=off [X86]
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+					       mmio_stale_data=off [X86]
29332978 					       no_entry_flush [PPC]
29342979 					       no_uaccess_flush [PPC]
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-					       mmio_stale_data=off [X86]
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+					       nobp=0 [S390]
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+					       nopti [X86,PPC]
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+					       nospectre_v1 [X86,PPC]
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+					       nospectre_v2 [X86,PPC,S390,ARM64]
29362984 					       retbleed=off [X86]
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+					       spec_store_bypass_disable=off [X86,PPC]
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+					       spectre_v2_user=off [X86]
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+					       ssbd=force-off [ARM64]
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+					       tsx_async_abort=off [X86]
29372989 
29382990 				Exceptions:
29392991 					       This does not have any effect on
....@@ -5191,6 +5243,17 @@
51915243 			Not specifying this option is equivalent to
51925244 			spectre_v2_user=auto.
51935245 
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+	spec_rstack_overflow=
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+			[X86] Control RAS overflow mitigation on AMD Zen CPUs
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+
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+			off		- Disable mitigation
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+			microcode	- Enable microcode mitigation only
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+			safe-ret	- Enable sw-only safe RET mitigation (default)
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+			ibpb		- Enable mitigation by issuing IBPB on
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+					  kernel entry
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+			ibpb-vmexit	- Issue IBPB only on VMEXIT
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+					  (cloud-specific mitigation)
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+
51945257 	spec_store_bypass_disable=
51955258 			[HW] Control Speculative Store Bypass (SSB) Disable mitigation
51965259 			(Speculative Store Bypass vulnerability)