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Message-ID: <Y8GEGnmD90bySl8C@google.com>
Date: Fri, 13 Jan 2023 16:17:30 +0000
From: Sean Christopherson <seanjc@...gle.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Michael Roth <michael.roth@....com>, kvm@...r.kernel.org,
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dgilbert@...hat.com, jarkko@...nel.org, ashish.kalra@....com,
harald@...fian.com, Nikunj A Dadhania <nikunj@....com>
Subject: Re: [PATCH RFC v7 07/64] KVM: SEV: Handle KVM_HC_MAP_GPA_RANGE
hypercall
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@....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...?
Don't bother, just drop the patch. It's perfectly legal for userspace to create
the private memslot in response to a guest request.
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