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Date:   Thu, 10 Oct 2019 13:06:06 -0400
From:   Sasha Levin <>
To:     Michael Kelley <>,
Cc:     Himadri Pandya <>,
        KY Srinivasan <>,
        Haiyang Zhang <>,
        Stephen Hemminger <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "himadri18.07" <>
Subject: Re: [PATCH] hv_sock: use HV_HYP_PAGE_SIZE instead of PAGE_SIZE_4K

On Fri, Oct 04, 2019 at 11:48:17AM -0400, Sasha Levin wrote:
>On Wed, Jul 31, 2019 at 01:02:03AM +0000, Michael Kelley wrote:
>>From: Himadri Pandya <> Sent: Wednesday, July 24, 2019 10:11 PM
>>>Older windows hosts require the hv_sock ring buffer to be defined
>>>using 4K pages. This was achieved by using the symbol PAGE_SIZE_4K
>>>defined specifically for this purpose. But now we have a new symbol
>>>HV_HYP_PAGE_SIZE defined in hyperv-tlfs which can be used for this.
>>>This patch removes the definition of symbol PAGE_SIZE_4K and replaces
>>>its usage with the symbol HV_HYP_PAGE_SIZE. This patch also aligns
>>>sndbuf and rcvbuf to hyper-v specific page size using HV_HYP_PAGE_SIZE
>>>instead of the guest page size(PAGE_SIZE) as hyper-v expects the page
>>>size to be 4K and it might not be the case on ARM64 architecture.
>>>Signed-off-by: Himadri Pandya <>
>>> net/vmw_vsock/hyperv_transport.c | 21 +++++++++++----------
>>> 1 file changed, 11 insertions(+), 10 deletions(-)
>>>diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c
>>>index f2084e3f7aa4..ecb5d72d8010 100644
>>>--- a/net/vmw_vsock/hyperv_transport.c
>>>+++ b/net/vmw_vsock/hyperv_transport.c
>>>@@ -13,15 +13,16 @@
>>> #include <linux/hyperv.h>
>>> #include <net/sock.h>
>>> #include <net/af_vsock.h>
>>>+#include <asm/hyperv-tlfs.h>
>>Reviewed-by:  Michael Kelley <>
>>This patch depends on a prerequisite patch in
>>  git:// x86/hyperv
>>that defines HV_HYP_PAGE_SIZE.
>David, the above prerequisite patch is now upstream, so this patch
>should be good to go. Would you take it through the net tree or should I
>do it via the hyperv tree?



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