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

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Feb 26, 2024 at 12:12:32PM +0200, Nikolay Borisov wrote:
> 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

I don't see the git commit id in any of these patches, can you fix that
up and resend them?

thanks,

greg k-h