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From: Barret Rhoden <brho@google.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	David Hildenbrand <david@redhat.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Alexander Duyck <alexander.h.duyck@linux.intel.com>,
	linux-nvdimm <linux-nvdimm@lists.01.org>, X86 ML <x86@kernel.org>,
	KVM list <kvm@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"Zeng, Jason" <jason.zeng@intel.com>
Subject: Re: [PATCH v4 2/2] kvm: Use huge pages for DAX-backed files
Date: Thu, 12 Dec 2019 14:16:33 -0500
Message-ID: <b50720a2-5358-19ea-a45e-a0c0628c68b0@google.com> (raw)
In-Reply-To: <CAPcyv4hkz8XCETELBaUOjHQf3=VyVB=KWeRVEPYejvdsg3_MWA@mail.gmail.com>

On 12/12/19 12:37 PM, Dan Williams wrote:
> Yeah, since device-dax is the only path to support longterm page
> pinning for vfio device assignment, testing with device-dax + 1GB
> pages would be a useful sanity check.

What are the issues with fs-dax and page pinning?  Is that limitation 
something that is permanent and unfixable (by me or anyone)?

I'd like to put a lot more in a DAX/pmem region than just a guest's 
memory, and having a mountable filesystem would be extremely convenient.

Thanks,

Barret



  reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-11 21:32 [PATCH v4 0/2] " Barret Rhoden
2019-12-11 21:32 ` [PATCH v4 1/2] mm: make dev_pagemap_mapping_shift() externally visible Barret Rhoden
2019-12-11 21:32 ` [PATCH v4 2/2] kvm: Use huge pages for DAX-backed files Barret Rhoden
2019-12-12  0:21   ` Paolo Bonzini
2019-12-12 12:22   ` David Hildenbrand
2019-12-12 16:31     ` Barret Rhoden
2019-12-12 12:33   ` Liran Alon
2019-12-12 16:54     ` Dan Williams
2019-12-12 17:39       ` Liran Alon
2019-12-12 17:59         ` Dan Williams
2019-12-12 18:32           ` Liran Alon
2019-12-12 17:03     ` Barret Rhoden
2019-12-12 17:34   ` Sean Christopherson
2019-12-12 17:37     ` Dan Williams
2019-12-12 19:16       ` Barret Rhoden [this message]
2019-12-12 19:48         ` Dan Williams
2019-12-12 20:08           ` Barret Rhoden
2019-12-12 17:45     ` Liran Alon
2019-12-12  0:22 ` [PATCH v4 0/2] " Paolo Bonzini

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