linux-kernel - Re: linux-next: manual merge of the kvm-x86 tree with Linus' tree

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Message-ID: <20250709171115.7556c98c@canb.auug.org.au>
Date: Wed, 9 Jul 2025 17:11:15 +1000
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Sean Christopherson <seanjc@...gle.com>
Cc: "Borislav Petkov (AMD)" <bp@...en8.de>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: Re: linux-next: manual merge of the kvm-x86 tree with Linus' tree

Hi all,

On Wed, 9 Jul 2025 16:04:56 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Today's linux-next merge of the kvm-x86 tree got a conflict in:
> 
>   arch/x86/kvm/vmx/vmx.c
> 
> between commit:
> 
>   f9af88a3d384 ("x86/bugs: Rename MDS machinery to something more generic")
> 
> from Linus' tree and commit:
> 
>   83ebe7157483 ("KVM: VMX: Apply MMIO Stale Data mitigation if KVM maps MMIO into the guest")
> 
> from the kvm-x86 tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.

Actually, the resolution is below.

-- 
Cheers,
Stephen Rothwell

diff --cc arch/x86/kvm/vmx/vmx.c
index 191a9ed0da22,65949882afa9..47019c9af671
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@@ -7290,8 -7210,8 +7210,8 @@@ static noinstr void vmx_vcpu_enter_exit
  	if (static_branch_unlikely(&vmx_l1d_should_flush))
  		vmx_l1d_flush(vcpu);
  	else if (static_branch_unlikely(&cpu_buf_vm_clear) &&
- 		 kvm_arch_has_assigned_device(vcpu->kvm))
+ 		 (flags & VMX_RUN_CLEAR_CPU_BUFFERS_FOR_MMIO))
 -		mds_clear_cpu_buffers();
 +		x86_clear_cpu_buffers();
  
  	vmx_disable_fb_clear(vmx);
  

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