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hv_sock: use HV_HYP_PAGE_SIZE for Hyper-V communication

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Current code assumes PAGE_SIZE (the guest page size) is equal
to the page size used to communicate with Hyper-V (which is
always 4K). While this assumption is true on x86, it may not
be true for Hyper-V on other architectures. For example,
Linux on ARM64 may have PAGE_SIZE of 16K or 64K. A new symbol,
HV_HYP_PAGE_SIZE, has been previously introduced to use when
the Hyper-V page size is intended instead of the guest page size.

Make this code work on non-x86 architectures by using the new
HV_HYP_PAGE_SIZE symbol instead of PAGE_SIZE, where appropriate.
Also replace the now redundant PAGE_SIZE_4K with HV_HYP_PAGE_SIZE.
The change has no effect on x86, but lays the groundwork to run
on ARM64 and others.

Signed-off-by: Himadri Pandya <himadrispandya@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Himadri Pandya 2019-10-13 00:30:21 +00:00 committed by David S. Miller
parent e17b932290
commit 77ffe33363
1 changed files with 12 additions and 10 deletions
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22
net/vmw_vsock/hyperv_transport.c
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@ -13,15 +13,16 @@
#include <linux/hyperv.h>
#include <net/sock.h>
#include <net/af_vsock.h>
#include <asm/hyperv-tlfs.h>
/* Older (VMBUS version 'VERSION_WIN10' or before) Windows hosts have some
* stricter requirements on the hv_sock ring buffer size of six 4K pages. Newer
* hosts don't have this limitation; but, keep the defaults the same for compat.
* stricter requirements on the hv_sock ring buffer size of six 4K pages.
* hyperv-tlfs defines HV_HYP_PAGE_SIZE as 4K. Newer hosts don't have this
* limitation; but, keep the defaults the same for compat.
*/
#define PAGE_SIZE_4K 4096
#define RINGBUFFER_HVS_RCV_SIZE (PAGE_SIZE_4K * 6)
#define RINGBUFFER_HVS_SND_SIZE (PAGE_SIZE_4K * 6)
#define RINGBUFFER_HVS_MAX_SIZE (PAGE_SIZE_4K * 64)
#define RINGBUFFER_HVS_RCV_SIZE (HV_HYP_PAGE_SIZE * 6)
#define RINGBUFFER_HVS_SND_SIZE (HV_HYP_PAGE_SIZE * 6)
#define RINGBUFFER_HVS_MAX_SIZE (HV_HYP_PAGE_SIZE * 64)
/* The MTU is 16KB per the host side's design */
#define HVS_MTU_SIZE (1024 * 16)
@ -54,7 +55,8 @@ struct hvs_recv_buf {
* ringbuffer APIs that allow us to directly copy data from userspace buffer
* to VMBus ringbuffer.
*/
#define HVS_SEND_BUF_SIZE (PAGE_SIZE_4K - sizeof(struct vmpipe_proto_header))
#define HVS_SEND_BUF_SIZE \
(HV_HYP_PAGE_SIZE - sizeof(struct vmpipe_proto_header))
struct hvs_send_buf {
/* The header before the payload data */
@ -393,10 +395,10 @@ static void hvs_open_connection(struct vmbus_channel *chan)
} else {
sndbuf = max_t(int, sk->sk_sndbuf, RINGBUFFER_HVS_SND_SIZE);
sndbuf = min_t(int, sndbuf, RINGBUFFER_HVS_MAX_SIZE);
sndbuf = ALIGN(sndbuf, PAGE_SIZE);
sndbuf = ALIGN(sndbuf, HV_HYP_PAGE_SIZE);
rcvbuf = max_t(int, sk->sk_rcvbuf, RINGBUFFER_HVS_RCV_SIZE);
rcvbuf = min_t(int, rcvbuf, RINGBUFFER_HVS_MAX_SIZE);
rcvbuf = ALIGN(rcvbuf, PAGE_SIZE);
rcvbuf = ALIGN(rcvbuf, HV_HYP_PAGE_SIZE);
}
ret = vmbus_open(chan, sndbuf, rcvbuf, NULL, 0, hvs_channel_cb,
@ -670,7 +672,7 @@ static ssize_t hvs_stream_enqueue(struct vsock_sock *vsk, struct msghdr *msg,
ssize_t ret = 0;
ssize_t bytes_written = 0;
BUILD_BUG_ON(sizeof(*send_buf) != PAGE_SIZE_4K);
BUILD_BUG_ON(sizeof(*send_buf) != HV_HYP_PAGE_SIZE);
send_buf = kmalloc(sizeof(*send_buf), GFP_KERNEL);
if (!send_buf)