linux-kernel - [GIT PULL] x86/urgent for v6.8-rc6

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Message-ID: <20240225105320.GAZdscIJ3wxkU8_6At@fat_crate.local>
Date: Sun, 25 Feb 2024 11:53:20 +0100
From: Borislav Petkov <bp@...en8.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: [GIT PULL] x86/urgent for v6.8-rc6

Hi Linus,

please pull a bunch of urgent x86 fixes for v6.8-rc6.

Thx.

---

The following changes since commit b401b621758e46812da61fa58a67c3fd8d91de0d:

  Linux 6.8-rc5 (2024-02-18 12:56:25 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tags/x86_urgent_for_v6.8_rc6

for you to fetch changes up to 43fb862de8f628c5db5e96831c915b9aebf62d33:

  KVM/VMX: Move VERW closer to VMentry for MDS mitigation (2024-02-19 16:31:59 -0800)

----------------------------------------------------------------
- Make sure clearing CPU buffers using VERW happens at the latest possible
  point in the return-to-userspace path, otherwise memory accesses after
  the VERW execution could cause data to land in CPU buffers again

----------------------------------------------------------------
Pawan Gupta (5):
      x86/bugs: Add asm helpers for executing VERW
      x86/entry_64: Add VERW just before userspace transition
      x86/entry_32: Add VERW just before userspace transition
      x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key
      KVM/VMX: Move VERW closer to VMentry for MDS mitigation

Sean Christopherson (1):
      KVM/VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH

 Documentation/arch/x86/mds.rst       | 38 +++++++++++++++++++++++++-----------
 arch/x86/entry/entry.S               | 23 ++++++++++++++++++++++
 arch/x86/entry/entry_32.S            |  3 +++
 arch/x86/entry/entry_64.S            | 11 +++++++++++
 arch/x86/entry/entry_64_compat.S     |  1 +
 arch/x86/include/asm/cpufeatures.h   |  2 +-
 arch/x86/include/asm/entry-common.h  |  1 -
 arch/x86/include/asm/nospec-branch.h | 25 ++++++++++++------------
 arch/x86/kernel/cpu/bugs.c           | 15 ++++++--------
 arch/x86/kernel/nmi.c                |  3 ---
 arch/x86/kvm/vmx/run_flags.h         |  7 +++++--
 arch/x86/kvm/vmx/vmenter.S           |  9 ++++++---
 arch/x86/kvm/vmx/vmx.c               | 20 +++++++++++++++----
 13 files changed, 112 insertions(+), 46 deletions(-)


-- 
Regards/Gruss,
    Boris.

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