r521 the BINAPI-07 oracle step 2: allocate a real class-0x2081 object on the live session (GSP_RM_ALLOC as the internal client/device parent) and send the query to it - the subdevice attempt answered NV_ERR_NOT_SUPPORTED because the server dispatches by the object's class

1 files changed, 51 insertions, 7 deletions

diff --git a/kernel/gsp_rm_emulation.c b/kernel/gsp_rm_emulation.c
index dc27a5d..b4c2872 100644
--- a/kernel/gsp_rm_emulation.c
+++ b/kernel/gsp_rm_emulation.c
@@ -2967,6 +2967,13 @@ MODULE_PARM_DESC(gsp_rm_binapi07_fwd,
 	"Forward only the guest GL core's BINAPI 0x20810107 query to the live GSP session (default 0; diagnostic/experiment)");
 
 /*
+ * The live session's BINAPI object (class 0x2081) created on demand by the
+ * 0x20810107 experiment; 0 until the first query allocates it. One device per
+ * module load, so a file-static is enough; reset by unload.
+ */
+static u32 gsp_rm_binapi07_be_object;
+
+/*
  * Bounded logging for the P3 forward counters: the first four fallbacks (so a
  * session that cannot forward is visible) and every 64th event. Never called
  * when the parameter is off.
@@ -3034,12 +3041,14 @@ static bool gsp_rm_ctrl_forward(struct gsp_emu_context *ctx,
 		 * driver's feature flag clear and the EGL surface init tears
 		 * down (EGL_BAD_ALLOC at eglMakeCurrent). The guest-side
 		 * handles (hClient 0xc1d..., a 0xbeef object) have no backend
-		 * counterpart, so translate to the live session's internal
-		 * subdevice: the GSP-side handler is expected to key off the
-		 * client session, not the caller's handle. The reply is
-		 * logged either way; an error falls back to the emulated
-		 * generic success until the semantics are known. Gated by its
-		 * own parameter so the P3 whitelist can stay off.
+		 * counterpart: allocate a real BINAPI object (class 0x2081) on
+		 * the live session once, then send the query to it. The first
+		 * attempt (subdevice translation) came back NV_ERR_NOT_SUPPORTED
+		 * (0x56) - the server dispatches the method by the OBJECT's
+		 * class, so a subdevice cannot answer a BINAPI method. The
+		 * reply is logged either way; an error falls back to the
+		 * emulated generic success until the semantics are known.
+		 * Gated by its own parameter so the P3 whitelist can stay off.
 		 */
 		if (!gsp_rm_binapi07_fwd_param)
 			return false;
@@ -3063,6 +3072,41 @@ static bool gsp_rm_ctrl_forward(struct gsp_emu_context *ctx,
 	if (gsp_phys_backend_static_get(&snap))
 		goto fallback;
 
+	if (guest_handles && !gsp_rm_binapi07_be_object) {
+		/*
+		 * Allocate the backend's BINAPI object: rpc_gsp_rm_alloc_v03_00
+		 * { hClient, hParent, hObject=0, hClass, status, paramsSize=0,
+		 * flags, reserved[4] }. The guest's own alloc used the DEVICE
+		 * as parent (hParent=0xbeef0004), so mirror that. The reply
+		 * carries status at +16 and the chosen handle at +32.
+		 */
+		u8 *areq;
+		void *arsp = NULL;
+		u32 arsp_len = 0, ast = 0xffffffff, ah = 0;
+		u32 acls = 0x2081;
+
+		areq = kzalloc(32, GFP_KERNEL);
+		if (!areq)
+			goto fallback;
+		memcpy(areq + 0, &snap.h_internal_client, 4);
+		memcpy(areq + 4, &snap.h_internal_device, 4);
+		memcpy(areq + 12, &acls, 4);
+		ret = gsp_phys_backend_rpc(GSPRM_RPC_FUNC_GSP_RM_ALLOC, areq,
+					   32, &arsp, &arsp_len, 500);
+		kfree(areq);
+		if (!ret && arsp && arsp_len >= 36) {
+			memcpy(&ast, (u8 *)arsp + 16, 4);
+			memcpy(&ah, (u8 *)arsp + 32, 4);
+		}
+		kfree(arsp);
+		nv_vgpu_info(ctx->vgpu,
+			     "vgsp-rm: BINAPI-EXPERIMENT backend alloc class=0x2081 (ret=%d): status=0x%x hObject=0x%x",
+			     ret, ast, ah);
+		if (ret || ast != 0 || !ah)
+			goto fallback;
+		gsp_rm_binapi07_be_object = ah;
+	}
+
 	/* Translate the guest's emulated internal handles; any other handle
 	 * domain stays emulated. */
 	if (!guest_handles &&
@@ -3076,7 +3120,7 @@ static bool gsp_rm_ctrl_forward(struct gsp_emu_context *ctx,
 		goto fallback;
 	memset(&fwd_hdr, 0, sizeof(fwd_hdr));
 	fwd_hdr.hClient = snap.h_internal_client;
-	fwd_hdr.hObject = guest_handles ? snap.h_internal_subdevice :
+	fwd_hdr.hObject = guest_handles ? gsp_rm_binapi07_be_object :
 			  (req->hObject == TU104_H_INTERNAL_DEVICE ?
 			   snap.h_internal_device : snap.h_internal_subdevice);
 	fwd_hdr.cmd = req->cmd;