Re: [RFC V1 5/5] x86: CVMs: Ensure that memory conversions happen at 2M alignment

[Dave Hansen]

On 1/11/24 21:52, Vishal Annapurve wrote:
> @@ -2133,8 +2133,10 @@ static int __set_memory_enc_pgtable(unsigned long addr, int numpages, bool enc)
>  	int ret;
>  
>  	/* Should not be working on unaligned addresses */
> -	if (WARN_ONCE(addr & ~PAGE_MASK, "misaligned address: %#lx\n", addr))
> -		addr &= PAGE_MASK;
> +	if (WARN_ONCE(addr & ~HPAGE_MASK, "misaligned address: %#lx\n", addr)
> +		|| WARN_ONCE((numpages << PAGE_SHIFT) & ~HPAGE_MASK,
> +			"misaligned numpages: %#lx\n", numpages))
> +		return -EINVAL;

This series is talking about swiotlb and DMA, then this applies a
restriction to what I *thought* was a much more generic function:
__set_memory_enc_pgtable().  What prevents this function from getting
used on 4k mappings?