Re: [RFC v2 PATCH 04/13] KVM: Add fd-based memslot data structure and utils

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On 11/19/21 14:47, Chao Peng wrote:
For fd-based memslot store the file references for shared fd and the
private fd (if any) in the memslot structure. Since there is no 'hva'
concept we cannot call hva_to_pfn() to get a pfn, instead kvm_memfd_ops
is added to get_pfn/put_pfn from the memory backing stores that provide
these fds.

Signed-off-by: Yu Zhang<yu.c.zhang@xxxxxxxxxxxxxxx>
Signed-off-by: Chao Peng<chao.p.peng@xxxxxxxxxxxxxxx>
---

What about kvm_read/write_guest? Maybe the proposal which kept userspace_addr for the shared fd is more doable (it would be great to ultimately remove the mandatory userspace mapping for the shared fd, but I think KVM is not quite ready for that).

Paolo




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