[RFC,08/11] Input: hyperv-keyboard: Make ringbuffer at least take two pages
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Message ID 20200721014135.84140-9-boqun.feng@gmail.com
State Superseded
Headers show
Series
  • Hyper-V: Support PAGE_SIZE larger than 4K
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Commit Message

Boqun Feng July 21, 2020, 1:41 a.m. UTC
When PAGE_SIZE > HV_HYP_PAGE_SIZE, we need the ringbuffer size to be at
least 2 * PAGE_SIZE: one page for the header and at least one page of
the data part (because of the alignment requirement for double mapping).

So make sure the ringbuffer sizes to be at least 2 * PAGE_SIZE when
using vmbus_open() to establish the vmbus connection.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
---
 drivers/input/serio/hyperv-keyboard.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch
diff mbox series

diff --git a/drivers/input/serio/hyperv-keyboard.c b/drivers/input/serio/hyperv-keyboard.c
index df4e9f6f4529..77ba57ba2691 100644
--- a/drivers/input/serio/hyperv-keyboard.c
+++ b/drivers/input/serio/hyperv-keyboard.c
@@ -75,8 +75,8 @@  struct synth_kbd_keystroke {
 
 #define HK_MAXIMUM_MESSAGE_SIZE 256
 
-#define KBD_VSC_SEND_RING_BUFFER_SIZE		(40 * 1024)
-#define KBD_VSC_RECV_RING_BUFFER_SIZE		(40 * 1024)
+#define KBD_VSC_SEND_RING_BUFFER_SIZE		max(40 * 1024, 2 * PAGE_SIZE)
+#define KBD_VSC_RECV_RING_BUFFER_SIZE		max(40 * 1024, 2 * PAGE_SIZE)
 
 #define XTKBD_EMUL0     0xe0
 #define XTKBD_EMUL1     0xe1