[PATCH] RISC-V: KVM: Remove automatic I/O mapping for VM_PFNMAP

[fangyu.yu at linux.alibaba.com]

>> From: Fangyu Yu <fangyu.yu at linux.alibaba.com>
>>
>> As of commit aac6db75a9fc ("vfio/pci: Use unmap_mapping_range()"),
>> vm_pgoff may no longer guaranteed to hold the PFN for VM_PFNMAP
>> regions. Using vma->vm_pgoff to derive the HPA here may therefore
>> produce incorrect mappings.
>>
>> Instead, I/O mappings for such regions can be established on-demand
>> during g-stage page faults, making the upfront ioremap in this path
>> is unnecessary.
>>
>> Fixes: 9d05c1fee837 ("RISC-V: KVM: Implement stage2 page table programming")
>> Signed-off-by: Fangyu Yu <fangyu.yu at linux.alibaba.com>
>
>LGTM.
>
>Queued it as fix for Linux-6.18
>
>Reviewed-by: Anup Patel <anup at brainfault.org>
>
>Thanks,
>Anup
>

Hi Anup:

Thanks for the review.

Please note that this patch has two build warnings, and I have fixed
on patch V2:
https://lore.kernel.org/linux-riscv/20251021142131.78796-1-fangyu.yu@linux.alibaba.com/

Thanks,
Fangyu