Replace TARGET_PAGE.* by runtime calls
We assume that page size is 4KB only, to dimension buffer size for
receiving message.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 hw/hyperv/syndbg.c    | 10 +++++++---
 hw/hyperv/meson.build |  2 +-
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/hw/hyperv/syndbg.c b/hw/hyperv/syndbg.c
index d3e39170772..0ec71d9bfb8 100644
--- a/hw/hyperv/syndbg.c
+++ b/hw/hyperv/syndbg.c
@@ -14,7 +14,7 @@
 #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"
 #include "hw/hyperv/hyperv-proto.h"
@@ -183,12 +183,14 @@ static bool create_udp_pkt(HvSynDbg *syndbg, void *pkt, uint32_t pkt_len,
     return true;
 }
 
+#define MSG_BUFSZ 4096
+
 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];
+    uint8_t data_buf[MSG_BUFSZ];
     hwaddr out_len;
     void *out_data;
     ssize_t recv_byte_count;
@@ -201,7 +203,7 @@ 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;
         }
@@ -374,6 +376,8 @@ static const Property hv_syndbg_properties[] = {
 
 static void hv_syndbg_class_init(ObjectClass *klass, void *data)
 {
+    g_assert(MSG_BUFSZ >= qemu_target_page_size());
+
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     device_class_set_props(dc, hv_syndbg_properties);
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'))
-- 
2.39.5

On 7/3/25 20:37, Pierrick Bouvier wrote:
> Replace TARGET_PAGE.* by runtime calls
> We assume that page size is 4KB only, to dimension buffer size for
> receiving message.
> 
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
> ---
>   hw/hyperv/syndbg.c    | 10 +++++++---
>   hw/hyperv/meson.build |  2 +-
>   2 files changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/hyperv/syndbg.c b/hw/hyperv/syndbg.c
> index d3e39170772..0ec71d9bfb8 100644
> --- a/hw/hyperv/syndbg.c
> +++ b/hw/hyperv/syndbg.c
> @@ -14,7 +14,7 @@
>   #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"
>   #include "hw/hyperv/hyperv-proto.h"
> @@ -183,12 +183,14 @@ static bool create_udp_pkt(HvSynDbg *syndbg, void *pkt, uint32_t pkt_len,
>       return true;
>   }
>   
> +#define MSG_BUFSZ 4096

(4 * KiB) is more readable, but, as a matter of style, I won't
object if you insist.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

On 3/7/25 12:56, Philippe Mathieu-Daudé wrote:
> On 7/3/25 20:37, Pierrick Bouvier wrote:
>> Replace TARGET_PAGE.* by runtime calls
>> We assume that page size is 4KB only, to dimension buffer size for
>> receiving message.
>>
>> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
>> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>> ---
>>    hw/hyperv/syndbg.c    | 10 +++++++---
>>    hw/hyperv/meson.build |  2 +-
>>    2 files changed, 8 insertions(+), 4 deletions(-)
>>
>> diff --git a/hw/hyperv/syndbg.c b/hw/hyperv/syndbg.c
>> index d3e39170772..0ec71d9bfb8 100644
>> --- a/hw/hyperv/syndbg.c
>> +++ b/hw/hyperv/syndbg.c
>> @@ -14,7 +14,7 @@
>>    #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"
>>    #include "hw/hyperv/hyperv-proto.h"
>> @@ -183,12 +183,14 @@ static bool create_udp_pkt(HvSynDbg *syndbg, void *pkt, uint32_t pkt_len,
>>        return true;
>>    }
>>    
>> +#define MSG_BUFSZ 4096
> 
> (4 * KiB) is more readable, but, as a matter of style, I won't
> object if you insist.
> 

Sure, I can change to that.

> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>