hw/hyperv/syndbg: common compilation unit

We assume that page size is 4KB only, to dimension buffer size for
receiving message.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-ID: <20250424232829.141163-5-pierrick.bouvier@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/hw/hyperv/syndbg.c b/hw/hyperv/syndbg.c
index ca291826a0..8b8a14750d 100644
--- a/hw/hyperv/syndbg.c
+++ b/hw/hyperv/syndbg.c
@@ -10,11 +10,11 @@
 #include "qemu/error-report.h"
 #include "qemu/main-loop.h"
 #include "qemu/sockets.h"
+#include "qemu/units.h"
 #include "qapi/error.h"
 #include "migration/vmstate.h"
 #include "hw/qdev-properties.h"
 #include "hw/loader.h"
-#include "cpu.h"
 #include "exec/target_page.h"
 #include "hw/hyperv/hyperv.h"
 #include "hw/hyperv/vmbus-bridge.h"
@@ -184,12 +184,15 @@ static bool create_udp_pkt(HvSynDbg *syndbg, void *pkt, uint32_t pkt_len,
     return true;
 }
 
+#define MSG_BUFSZ (4 * KiB)
+
 static uint16_t handle_recv_msg(HvSynDbg *syndbg, uint64_t outgpa,
                                 uint32_t count, bool is_raw, uint32_t options,
                                 uint64_t timeout, uint32_t *retrieved_count)
 {
     uint16_t ret;
-    uint8_t data_buf[TARGET_PAGE_SIZE - UDP_PKT_HEADER_SIZE];
+    g_assert(MSG_BUFSZ >= qemu_target_page_size());
+    uint8_t data_buf[MSG_BUFSZ];
     hwaddr out_len;
     void *out_data;
     ssize_t recv_byte_count;
@@ -202,7 +205,7 @@ static uint16_t handle_recv_msg(HvSynDbg *syndbg, uint64_t outgpa,
         recv_byte_count = 0;
     } else {
         recv_byte_count = recv(syndbg->socket, data_buf,
-                               MIN(sizeof(data_buf), count), MSG_WAITALL);
+                               MIN(MSG_BUFSZ, count), MSG_WAITALL);
         if (recv_byte_count == -1) {
             return HV_STATUS_INVALID_PARAMETER;
         }