[PATCH] KVM: arm64: Fix detection of shared VMAs on guest fault

[Steven Price]

On 13/07/2021 12:48, Marc Zyngier wrote:
> When merging the KVM MTE support, the blob that was interposed between
> the chair and the keyboard experienced a neuronal accident (also known
> as a brain fart), turning a check for VM_SHARED into VM_PFNMAP as it
> was reshuffling some of the code.
> 
> The blob having now come back to its senses, let's restore the
> initial check that the original author got right the first place.
> 
> Fixes: ea7fc1bb1cd1 ("KVM: arm64: Introduce MTE VM feature")
> Cc: Steven Price <steven.price at arm.com>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Signed-off-by: Marc Zyngier <maz at kernel.org>

Reviewed-by: Steven Price <steven.price at arm.com>

Somehow this blob missed it too while reviewing the changes you'd made.

Thanks,

Steve

> ---
>  arch/arm64/kvm/mmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
> index 3155c9e778f0..0625bf2353c2 100644
> --- a/arch/arm64/kvm/mmu.c
> +++ b/arch/arm64/kvm/mmu.c
> @@ -947,7 +947,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
>  		vma_shift = get_vma_page_shift(vma, hva);
>  	}
>  
> -	shared = (vma->vm_flags & VM_PFNMAP);
> +	shared = (vma->vm_flags & VM_SHARED);
>  
>  	switch (vma_shift) {
>  #ifndef __PAGETABLE_PMD_FOLDED
>