[PATCH 0/7] 5.4 backport of recent mds improvement patches

[Nikolay Borisov <nik.borisov@suse.com>]

Here's the recently merged mds improvement patches adapted to latest stable tree.
I've only compile tested them, but since I have also done similar backports for
older kernels I'm sure they should work.
The main difference is in the definition of the CLEAR_CPU_BUFFERS macro since
5.4 doesn't contains the alternative relocation handling logic hence the verw
instruction is moved out of the alternative definition and instead we have a jump which
skips the verw instruction there. That way the relocation will be handled by the
toolchain rather than the kernel.

H. Peter Anvin (Intel) (1):
  x86/asm: Add _ASM_RIP() macro for x86-64 (%rip) suffix

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/x86/mds.rst            | 38 ++++++++++++++++++++--------
 arch/x86/entry/Makefile              |  2 +-
 arch/x86/entry/common.c              |  2 --
 arch/x86/entry/entry.S               | 23 +++++++++++++++++
 arch/x86/entry/entry_32.S            |  3 +++
 arch/x86/entry/entry_64.S            | 10 ++++++++
 arch/x86/entry/entry_64_compat.S     |  1 +
 arch/x86/include/asm/asm.h           |  6 ++++-
 arch/x86/include/asm/cpufeatures.h   |  2 +-
 arch/x86/include/asm/irqflags.h      |  1 +
 arch/x86/include/asm/nospec-branch.h | 26 ++++++++++---------
 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               | 12 ++++++---
 16 files changed, 111 insertions(+), 49 deletions(-)
 create mode 100644 arch/x86/entry/entry.S

--
2.34.1