Re: [PATCH 5.15 v3 02/11] KVM: arm64: Always start with clearing SVE flag on load

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

Summary of potential issues:
ℹ️ This is part 02/11 of a series
❌ Build failures detected

The upstream commit SHA1 provided is correct: d52d165d67c5aa26c8c89909003c94a66492d23d

WARNING: Author mismatch between patch and upstream commit:
Backport author: Mark Brown<broonie@kernel.org>
Commit author: Marc Zyngier<maz@kernel.org>

Status in newer kernel trees:
6.14.y | Present (exact SHA1)
6.13.y | Present (exact SHA1)
6.12.y | Present (exact SHA1)
6.6.y | Present (exact SHA1)
6.1.y | Present (exact SHA1)

Note: The patch differs from the upstream commit:
---
1:  d52d165d67c5a ! 1:  ab39b2accf324 KVM: arm64: Always start with clearing SVE flag on load
    @@ Metadata
      ## Commit message ##
         KVM: arm64: Always start with clearing SVE flag on load
     
    +    [ Upstream commit d52d165d67c5aa26c8c89909003c94a66492d23d ]
    +
         On each vcpu load, we set the KVM_ARM64_HOST_SVE_ENABLED
         flag if SVE is enabled for EL0 on the host. This is used to restore
         the correct state on vpcu put.
    @@ Commit message
         Cc: stable@vger.kernel.org
         Reviewed-by: Mark Brown <broonie@kernel.org>
         Link: https://lore.kernel.org/r/20220528113829.1043361-2-maz@kernel.org
    +    Signed-off-by: Mark Brown <broonie@kernel.org>
     
      ## arch/arm64/kvm/fpsimd.c ##
     @@ arch/arm64/kvm/fpsimd.c: void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
    @@ arch/arm64/kvm/fpsimd.c: void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
     +	vcpu->arch.flags &= ~KVM_ARM64_HOST_SVE_ENABLED;
      	if (read_sysreg(cpacr_el1) & CPACR_EL1_ZEN_EL0EN)
      		vcpu->arch.flags |= KVM_ARM64_HOST_SVE_ENABLED;
    - 
    + }
---

NOTE: These results are for this patch alone. Full series testing will be
performed when all parts are received.

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.1.y        |  Success    |  Failed    |

Build Errors:
Build error:
    Segmentation fault
    make: *** [Makefile:1231: vmlinux] Error 139
    make: Target '__all' not remade because of errors.