linux-kernel - [RFC v2 06/11] hv: hyperv.h: Introduce some hvpfn helper functions

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Message-Id: <20200902030107.33380-7-boqun.feng@gmail.com>
Date:   Wed,  2 Sep 2020 11:01:02 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     linux-hyperv@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org
Cc:     "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>,
        Boqun Feng <boqun.feng@...il.com>
Subject: [RFC v2 06/11] hv: hyperv.h: Introduce some hvpfn helper functions

When a guest communicate with the hypervisor, it must use HV_HYP_PAGE to
calculate PFN, so introduce a few hvpfn helper functions as the
counterpart of the page helper functions. This is the preparation for
supporting guest whose PAGE_SIZE is not 4k.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 include/linux/hyperv.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 6f4831212979..54e84ba6b554 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1687,4 +1687,8 @@ static inline unsigned long virt_to_hvpfn(void *addr)
 	return  paddr >> HV_HYP_PAGE_SHIFT;
 }
 
+#define offset_in_hvpage(ptr)	((unsigned long)(ptr) & ~HV_HYP_PAGE_MASK)
+#define HVPFN_UP(x)	(((x) + HV_HYP_PAGE_SIZE-1) >> HV_HYP_PAGE_SHIFT)
+#define page_to_hvpfn(page)	((page_to_pfn(page) << PAGE_SHIFT) >> HV_HYP_PAGE_SHIFT)
+
 #endif /* _HYPERV_H */
-- 
2.28.0