linux-kernel - Re: [RFC 01/11] Drivers: hv: vmbus: Always use HV_HYP_PAGE

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Message-ID: <20200721152218.ozpk2b4ymfdocu4p@liuwe-devbox-debian-v2>
Date:   Tue, 21 Jul 2020 15:22:18 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     linux-hyperv@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org, "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Michael Kelley <mikelley@...rosoft.com>
Subject: Re: [RFC 01/11] Drivers: hv: vmbus: Always use HV_HYP_PAGE_SIZE for
 gpadl

On Tue, Jul 21, 2020 at 09:41:25AM +0800, Boqun Feng wrote:
> Since the hypervisor always uses 4K as its page size, the size of PFNs
> used for gpadl should be HV_HYP_PAGE_SIZE rather than PAGE_SIZE, so
> adjust this accordingly as the preparation for supporting 16K/64K page
> size guests.

It may be worth calling out there is no change on x86 because
HV_HYP_PAGE_SHIFT and PAGE_SHIFT are of the same value there.

Wei.