[PULL 11/22] hw/hyperv/syndbg: common compilation unit

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

From: Pierrick Bouvier <pierrick.bouvier@linaro.org>

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>
---
 hw/hyperv/syndbg.c    | 9 ++++++---
 hw/hyperv/meson.build | 2 +-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/hw/hyperv/syndbg.c b/hw/hyperv/syndbg.c
index ca291826a07..8b8a14750dd 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;
         }
diff --git a/hw/hyperv/meson.build b/hw/hyperv/meson.build
index c855fdcf04c..a9f2045a9af 100644
--- a/hw/hyperv/meson.build
+++ b/hw/hyperv/meson.build
@@ -1,6 +1,6 @@
 specific_ss.add(when: 'CONFIG_HYPERV', if_true: files('hyperv.c'))
 specific_ss.add(when: 'CONFIG_HYPERV_TESTDEV', if_true: files('hyperv_testdev.c'))
 system_ss.add(when: 'CONFIG_VMBUS', if_true: files('vmbus.c'))
-specific_ss.add(when: 'CONFIG_SYNDBG', if_true: files('syndbg.c'))
+system_ss.add(when: 'CONFIG_SYNDBG', if_true: files('syndbg.c'))
 specific_ss.add(when: 'CONFIG_HV_BALLOON', if_true: files('hv-balloon.c', 'hv-balloon-page_range_tree.c', 'hv-balloon-our_range_memslots.c'))
 system_ss.add(when: 'CONFIG_HV_BALLOON', if_false: files('hv-balloon-stub.c'))
-- 
2.47.1