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Pawan Gupta 07946d956b x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key 
commit 6613d82e61 upstream.

The VERW mitigation at exit-to-user is enabled via a static branch
mds_user_clear. This static branch is never toggled after boot, and can
be safely replaced with an ALTERNATIVE() which is convenient to use in
asm.

Switch to ALTERNATIVE() to use the VERW mitigation late in exit-to-user
path. Also remove the now redundant VERW in exc_nmi() and
arch_exit_to_user_mode().

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20240213-delay-verw-v8-4-a6216d83edb7%40linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-03-06 14:45:20 +00:00
..
i386 Documentation: x86: convert i386/IO-APIC.txt to reST 2019-05-08 14:34:11 -06:00
x86_64 dma-mapping updates 2022-08-06 10:56:45 -07:00
amd-memory-encryption.rst x86/sev: Add SEV-SNP guest feature negotiation support 2023-02-01 08:34:50 +01:00
amd_hsmp.rst Documentation: Add x86/amd_hsmp driver 2022-03-02 11:42:36 +01:00
boot.rst x86/efistub: Simplify and clean up handover entry code 2024-03-06 14:45:18 +00:00
booting-dt.rst dt: Remove booting-without-of.rst 2020-10-13 13:33:16 -05:00
buslock.rst Documentation/x86: Add ratelimit in buslock.rst 2021-05-18 16:39:31 +02:00
cpuinfo.rst x86/cpu: Remove "nosmep" 2022-04-04 10:17:00 +02:00
earlyprintk.rst Documentation: x86: earlyprintk: drop doubled words 2020-07-13 09:47:38 -06:00
elf_auxvec.rst x86/elf: Support a new ELF aux vector AT_MINSIGSTKSZ 2021-05-19 12:18:45 +02:00
entry_64.rst docs: x86: replace do_IRQ int the entry_64.rst with common_interrupt() 2022-09-27 13:21:44 -06:00
exception-tables.rst Documentation: x86: Fix obsolete name of page fault handler 2022-04-05 10:28:36 -06:00
features.rst docs: archis: add a per-architecture features list 2020-12-03 15:10:15 -07:00
ifs.rst Documentation: In-Field Scan 2022-05-12 15:35:29 +02:00
index.rst It was a moderately busy cycle for documentation; highlights include: 2022-05-25 11:17:41 -07:00
intel-hfi.rst x86/Documentation: Describe the Intel Hardware Feedback Interface 2022-02-03 19:50:48 +01:00
intel_txt.rst docs: x86: move two x86-specific files to x86 arch dir 2019-07-15 11:03:01 -03:00
iommu.rst Documentation: x86: rework IOMMU documentation 2022-04-28 07:59:45 -06:00
kernel-stacks.rst Some late arriving documentation changes. In particular, this contains the 2019-05-10 13:24:53 -04:00
mds.rst x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key 2024-03-06 14:45:20 +00:00
microcode.rst x86/microcode: Document the whole late loading problem 2022-08-18 15:57:53 +02:00
mtrr.rst docs: x86: avoid using ReST :doc:foo markup 2021-06-17 13:24:39 -06:00
orc-unwinder.rst objtool: update objtool.txt references 2022-07-07 13:10:00 -06:00
pat.rst remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
pti.rst Documentation: x86: convert pti.txt to reST 2019-05-08 14:34:10 -06:00
resctrl.rst Documentation/x86: Rename resctrl_ui.rst and add two errata to the file 2020-10-27 16:47:00 +01:00
sgx.rst Documentation/x86: Introduce enclave runtime management section 2022-07-07 10:13:03 -07:00
sva.rst Documentation/x86: Update documentation for SVA (Shared Virtual Addressing) 2022-02-15 11:31:43 +01:00
tdx.rst Documentation/x86: Document TDX kernel architecture 2022-04-08 06:57:09 -07:00
tlb.rst Documentation: x86: convert tlb.txt to reST 2019-05-08 14:34:10 -06:00
topology.rst x86/CPU/AMD: Save AMD NodeId as cpu_die_id 2020-11-19 11:43:13 +01:00
tsx_async_abort.rst x86/speculation/taa: Add documentation for TSX Async Abort 2019-10-28 08:37:00 +01:00
usb-legacy-support.rst Documentation: x86: convert usb-legacy-support.txt to reST 2019-05-08 14:34:11 -06:00
xstate.rst x86/fpu: Optimize out sigframe xfeatures when in init state 2021-11-03 22:42:35 +01:00
zero-page.rst x86/boot: Add a pointer to Confidential Computing blob in bootparams 2022-04-07 16:47:11 +02:00