diff options
| author | Arthur Hanson Rasmusson <arthur@vgpu.io> | 2026-09-30 06:44:10 -0400 |
|---|---|---|
| committer | Arthur Hanson Rasmusson <arthur@vgpu.io> | 2026-09-30 06:44:10 -0400 |
| commit | a94c1b0ed4fd8043e3235fe337bf8d0f2472f9f5 (patch) | |
| tree | 04e98f6cd010574e4d6825d08a6aef0afd88861c /kernel/main.c | |
| parent | 8d081d5709c1cb2d19ee3df0648225de9187c226 (diff) | |
| download | open-iov-a94c1b0ed4fd8043e3235fe337bf8d0f2472f9f5.tar.gz open-iov-a94c1b0ed4fd8043e3235fe337bf8d0f2472f9f5.zip | |
sema-svc: destination-keyed copy watch (dump page-table writes)
sema_copy_dst=dumps the source bytes of every copy whose destination falls
in the given page, so the 32-byte page-directory updates the guest writes
into vidmem can be read directly and their entry encoding learned.
Diffstat (limited to 'kernel/main.c')
| -rw-r--r-- | kernel/main.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/main.c b/kernel/main.c index 7fe2d15..d6e6c9d 100644 --- a/kernel/main.c +++ b/kernel/main.c @@ -2476,6 +2476,14 @@ module_param_named(sema_copy_pat, gsp_sema_copy_pat, ullong, 0644); MODULE_PARM_DESC(sema_copy_pat, "8-byte pattern matched in copy src/dst and pushes (default 0)"); /* + * Data-path watch: dump the source bytes of copies whose destination falls + * in this address's page (up to 32 samples): + * echo 0x200000 > .../parameters/sema_copy_dst + */ +module_param_named(sema_copy_dst, gsp_sema_copy_dst, ullong, 0644); +MODULE_PARM_DESC(sema_copy_dst, "Dump source bytes of copies landing in this page (default 0)"); + +/* * Grace window (ms) an untranslatable CE entry stays pending before the * fallback acknowledges its release and consumes it. Its work must run before * the release the client synchronizes on; the translation usually lands within |