diff options
| author | Himadri Pandya <himadrispandya@gmail.com> | 2019-10-13 00:30:21 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-10-15 17:25:17 -0700 |
| commit | 77ffe33363c02c51c70303d6b79bab70451ba83e (patch) | |
| tree | af496e4a9564202b3d48e411fa7e159cdf4c1fa9 /net | |
| parent | e17b932290bf4cabe7fd4dd7cbd789dcd49c7df5 (diff) | |
| download | linux-77ffe33363c02c51c70303d6b79bab70451ba83e.tar.bz2 | |
hv_sock: use HV_HYP_PAGE_SIZE for Hyper-V communication
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/vmw_vsock/hyperv_transport.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c index c443db7af8d4..bef8772116ec 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> /* 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) |