Messages in this thread | | | Date | Mon, 16 Jan 2023 13:26:02 +0530 | Subject | Re: [PATCH RFC v7 07/64] KVM: SEV: Handle KVM_HC_MAP_GPA_RANGE hypercall | From | "Nikunj A. Dadhania" <> |
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On 13/01/23 21:47, Sean Christopherson wrote: > On Fri, Jan 13, 2023, Borislav Petkov wrote: >> On Wed, Dec 14, 2022 at 01:39:59PM -0600, Michael Roth wrote: >>> From: Nikunj A Dadhania <nikunj@amd.com> >>> >>> KVM_HC_MAP_GPA_RANGE hypercall is used by the SEV guest to notify a >>> change in the page encryption status to the hypervisor. >>> >>> The hypercall exits to userspace with KVM_EXIT_HYPERCALL exit code, >>> currently this is used for explicit memory conversion between >>> shared/private for memfd based private memory. >> >> So Tom and I spent a while to figure out what this is doing... >> >> Please explain in more detail what that is. Like the hypercall gets ignored for >> memslots which cannot be private...?
This was required when we were using per memslot bitmap for storing the private information, mem_attr_array is not dependent on memslot anymore.
> > Don't bother, just drop the patch.
Agree, we can drop this. I have tested SEV without this patch.
> It's perfectly legal for userspace to create the private memslot in response > to a guest request.
Sean, did not understand this part, how could a memslot be created on a guest request?
Regards Nikunj
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