Re: [PATCH 5/7] hw/hyperv/syndbg: common compilation unit

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On 3/6/25 08:19, Richard Henderson wrote:
On 3/5/25 22:41, Pierrick Bouvier wrote:
Replace TARGET_PAGE.* by runtime calls

Signed-off-by: Pierrick Bouvier <pierrick.bouvier@xxxxxxxxxx>
---
   hw/hyperv/syndbg.c    | 7 ++++---
   hw/hyperv/meson.build | 2 +-
   2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/hw/hyperv/syndbg.c b/hw/hyperv/syndbg.c
index d3e39170772..f9382202ed3 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"
@@ -188,7 +188,8 @@ static uint16_t handle_recv_msg(HvSynDbg *syndbg, uint64_t outgpa,
                                   uint64_t timeout, uint32_t *retrieved_count)
   {
       uint16_t ret;
-    uint8_t data_buf[TARGET_PAGE_SIZE - UDP_PKT_HEADER_SIZE];
+    const size_t buf_size = qemu_target_page_size() - UDP_PKT_HEADER_SIZE;
+    uint8_t *data_buf = g_alloca(buf_size);
       hwaddr out_len;
       void *out_data;
       ssize_t recv_byte_count;

We've purged the code base of VLAs, and those are preferable to alloca.
Just use g_malloc and g_autofree.


I hesitated, due to potential performance considerations for people reviewing the patch. I'll switch to heap based storage.


r~





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