linux-stable/arch/x86/kernel/fpu
Linus Torvalds 3fd33273a4 Reenable ENQCMD/PASID support:
- Simplify the PASID handling to allocate the PASID once, associate it to
    the mm of a process and free it on mm_exit(). The previous attempt of
    refcounted PASIDs and dynamic alloc()/free() turned out to be error
    prone and too complex. The PASID space is 20bits, so the case of
    resource exhaustion is a pure academic concern.
 
  - Populate the PASID MSR on demand via #GP to avoid racy updates via IPIs.
 
  - Reenable ENQCMD and let objtool check for the forbidden usage of ENQCMD
    in the kernel.
 
  - Update the documentation for Shared Virtual Addressing accordingly.
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Merge tag 'x86-pasid-2022-03-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 PASID support from Thomas Gleixner:
 "Reenable ENQCMD/PASID support:

   - Simplify the PASID handling to allocate the PASID once, associate
     it to the mm of a process and free it on mm_exit().

     The previous attempt of refcounted PASIDs and dynamic
     alloc()/free() turned out to be error prone and too complex. The
     PASID space is 20bits, so the case of resource exhaustion is a pure
     academic concern.

   - Populate the PASID MSR on demand via #GP to avoid racy updates via
     IPIs.

   - Reenable ENQCMD and let objtool check for the forbidden usage of
     ENQCMD in the kernel.

   - Update the documentation for Shared Virtual Addressing accordingly"

* tag 'x86-pasid-2022-03-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Documentation/x86: Update documentation for SVA (Shared Virtual Addressing)
  tools/objtool: Check for use of the ENQCMD instruction in the kernel
  x86/cpufeatures: Re-enable ENQCMD
  x86/traps: Demand-populate PASID MSR via #GP
  sched: Define and initialize a flag to identify valid PASID in the task
  x86/fpu: Clear PASID when copying fpstate
  iommu/sva: Assign a PASID to mm on PASID allocation and free it on mm exit
  kernel/fork: Initialize mm's PASID
  iommu/ioasid: Introduce a helper to check for valid PASIDs
  mm: Change CONFIG option for mm->pasid field
  iommu/sva: Rename CONFIG_IOMMU_SVA_LIB to CONFIG_IOMMU_SVA
2022-03-21 12:28:13 -07:00
..
bugs.c x86/fpu: Replace the includes of fpu/internal.h 2021-10-20 15:27:29 +02:00
context.h x86/fpu: Update XFD state where required 2021-10-26 10:53:02 +02:00
core.c x86/fpu: Clear PASID when copying fpstate 2022-02-15 11:31:43 +01:00
init.c x86/fpu: Add fpu_state_config::legacy_features 2021-10-26 10:18:09 +02:00
internal.h x86/fpu/signal: Prepare for variable sigframe length 2021-10-26 10:18:09 +02:00
legacy.h x86/fpu: Remove .fixup usage 2021-12-11 09:09:48 +01:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
regset.c x86/ptrace: Fix xfpregs_set()'s incorrect xmm clearing 2022-02-18 11:23:21 +01:00
signal.c x86/fpu/signal: Initialize sw_bytes in save_xstate_epilog() 2021-11-30 15:13:47 -08:00
xstate.c x86/kvm/fpu: Limit guest user_xfeatures to supported bits of XCR0 2022-02-17 10:05:57 -05:00
xstate.h RISCV: 2022-01-16 16:15:14 +02:00