linux-kernel - Re: [RFC PATCH v2 04/51] KVM: guest_memfd: Introduce KVM_GMEM_CONVERT

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Message-ID: <20250718141559.GF2206214@ziepe.ca>
Date: Fri, 18 Jul 2025 11:15:59 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Xu Yilun <yilun.xu@...ux.intel.com>
Cc: Ackerley Tng <ackerleytng@...gle.com>, Yan Zhao <yan.y.zhao@...el.com>,
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Subject: Re: [RFC PATCH v2 04/51] KVM: guest_memfd: Introduce
 KVM_GMEM_CONVERT_SHARED/PRIVATE ioctls

On Fri, Jul 18, 2025 at 10:48:55AM +0800, Xu Yilun wrote:
> > If by the time KVM gets the conversion request, the page is unpinned,
> > then we're all good, right?
> 
> Yes, unless guest doesn't unpin the page first by mistake. Guest would
> invoke a fw call tdg.mem.page.release to unpin the page before
> KVM_HC_MAP_GPA_RANGE.

What does guest pinning mean?

Jason