[RFC v2 01/11] Drivers: hv: vmbus: Always use HV_HYP_PAGE_SIZE for gpadl

[Boqun Feng]

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.f...@gmail.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