linux-kernel - [PATCH v4 01/11] Drivers: hv: vmbus: Always use HV_HYP_PAGE

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Date:   Wed, 16 Sep 2020 11:48:07 +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, linux-arm-kernel@...ts.infradead.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>, will@...nel.org,
        ardb@...nel.org, arnd@...db.de, catalin.marinas@....com,
        mark.rutland@....com, maz@...nel.org,
        Boqun Feng <boqun.feng@...il.com>
Subject: [PATCH v4 01/11] Drivers: hv: vmbus: Always use HV_HYP_PAGE_SIZE for gpadl

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. No functional changes on x86, since PAGE_SIZE is always 4k
(equals to HV_HYP_PAGE_SIZE).

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
---
 drivers/hv/channel.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 3ebda7707e46..4d0f8e5a88d6 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -22,9 +22,6 @@
 
 #include "hyperv_vmbus.h"
 
-#define NUM_PAGES_SPANNED(addr, len) \
-((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT))
-
 static unsigned long virt_to_hvpfn(void *addr)
 {
 	phys_addr_t paddr;
@@ -35,7 +32,7 @@ static unsigned long virt_to_hvpfn(void *addr)
 	else
 		paddr = __pa(addr);
 
-	return  paddr >> PAGE_SHIFT;
+	return  paddr >> HV_HYP_PAGE_SHIFT;
 }
 
 /*
@@ -330,7 +327,7 @@ static int create_gpadl_header(void *kbuffer, u32 size,
 
 	int pfnsum, pfncount, pfnleft, pfncurr, pfnsize;
 
-	pagecount = size >> PAGE_SHIFT;
+	pagecount = size >> HV_HYP_PAGE_SHIFT;
 
 	/* do we need a gpadl body msg */
 	pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
@@ -360,7 +357,7 @@ static int create_gpadl_header(void *kbuffer, u32 size,
 		gpadl_header->range[0].byte_count = size;
 		for (i = 0; i < pfncount; i++)
 			gpadl_header->range[0].pfn_array[i] = virt_to_hvpfn(
-				kbuffer + PAGE_SIZE * i);
+				kbuffer + HV_HYP_PAGE_SIZE * i);
 		*msginfo = msgheader;
 
 		pfnsum = pfncount;
@@ -412,7 +409,7 @@ static int create_gpadl_header(void *kbuffer, u32 size,
 			 */
 			for (i = 0; i < pfncurr; i++)
 				gpadl_body->pfn[i] = virt_to_hvpfn(
-					kbuffer + PAGE_SIZE * (pfnsum + i));
+					kbuffer + HV_HYP_PAGE_SIZE * (pfnsum + i));
 
 			/* add to msg header */
 			list_add_tail(&msgbody->msglistentry,
@@ -441,7 +438,7 @@ static int create_gpadl_header(void *kbuffer, u32 size,
 		gpadl_header->range[0].byte_count = size;
 		for (i = 0; i < pagecount; i++)
 			gpadl_header->range[0].pfn_array[i] = virt_to_hvpfn(
-				kbuffer + PAGE_SIZE * i);
+				kbuffer + HV_HYP_PAGE_SIZE * i);
 
 		*msginfo = msgheader;
 	}
-- 
2.28.0