Re: [PATCH 1/2] KVM: arm64: Drop useless __GFP_HIGHMEM from kvm struct allocation

[Nathan Chancellor <nathan@kernel.org>]

On Wed, Nov 19, 2025 at 01:38:21AM -0800, Oliver Upton wrote:
> A recent change on the receiving end of vmalloc() started warning about
> unsupported GFP flags passed by the caller. Nathan reports that this
> warning fires in kvm_arch_alloc_vm(), owing to the fact that KVM is
> passing a meaningless __GFP_HIGHMEM.
> 
> Do as the warning says and fix the code.
> 
> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
> Reported-by: Nathan Chancellor <nathan@kernel.org>
> Closes: https://lore.kernel.org/kvmarm/20251118224448.GA998046@ax162/
> Signed-off-by: Oliver Upton <oupton@kernel.org>

Tested-by: Nathan Chancellor <nathan@kernel.org>

Thanks for the patch!

> ---
>  arch/arm64/kvm/arm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> index 870953b4a8a7..e791fa52f874 100644
> --- a/arch/arm64/kvm/arm.c
> +++ b/arch/arm64/kvm/arm.c
> @@ -440,7 +440,7 @@ struct kvm *kvm_arch_alloc_vm(void)
>  	if (!has_vhe())
>  		return kzalloc(sz, GFP_KERNEL_ACCOUNT);
>  
> -	return __vmalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_HIGHMEM | __GFP_ZERO);
> +	return __vmalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_ZERO);
>  }
>  
>  int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
> -- 
> 2.47.3
>