r655 diagnostics: dump unknown-RPC payloads and UPDATE_BAR_PDE payloads (wall-2 forensics aid - the r670 capture proved zero unknown RPCs and no mapping RPC during the client's vkCreateDevice attempts, so these dumps are bounded evidence tools for the next wall)

1 files changed, 42 insertions, 0 deletions

diff --git a/kernel/gsp_rm_emulation.c b/kernel/gsp_rm_emulation.c
index 49758b4..2e47f98 100644
--- a/kernel/gsp_rm_emulation.c
+++ b/kernel/gsp_rm_emulation.c
@@ -4656,6 +4656,23 @@ static void gsp_rm_handle_element(struct gsp_emu_context *ctx, const u8 *elem)
 		 * For vGPU, we just acknowledge success. */
 		nv_vgpu_info(ctx->vgpu, "vgsp-rm: RPC UPDATE_BAR_PDE(%u) seq=%u len=%u -> SUCCESS",
 			     function, sequence, hdr->length);
+		{
+			const u8 *pl = (const u8 *)hdr + sizeof(*hdr);
+			u32 n = min_t(u32, hdr->length, 64);
+			char dump[256];
+			int o = 0;
+			u32 i;
+
+			for (i = 0; i < n; i += 4) {
+				u32 v = 0;
+
+				memcpy(&v, pl + i, 4);
+				o += snprintf(dump + o, sizeof(dump) - o,
+					      "%08x ", v);
+			}
+			nv_vgpu_info(ctx->vgpu,
+				     "vgsp-rm:   bar-pde payload: %s", dump);
+		}
 		if (gsp_rm_send(ctx, function, sequence, 0, NULL, 0))
 			nv_vgpu_err(ctx->vgpu, "vgsp-rm: UPDATE_BAR_PDE reply send failed");
 		else
@@ -4684,6 +4701,31 @@ static void gsp_rm_handle_element(struct gsp_emu_context *ctx, const u8 *elem)
 			nv_vgpu_info(ctx->vgpu, "vgsp-rm: RPC %s(%u) seq=%u len=%u -> generic SUCCESS reply (unknown #%llu)",
 				     gsp_rm_rpc_name(function), function,
 				     sequence, hdr->length, rm->unknown_rpcs);
+		/*
+		 * Bounded payload dump for the first unknown RPCs: the vGPU
+		 * guest maps its client VA spaces through some RPC; the
+		 * mapping data (va pages / PAs / memdesc handles) must be
+		 * visible here to be captured. Never echo it back (pure
+		 * queries would eat their own stack garbage).
+		 */
+		if (rm->unknown_rpcs <= 96 && hdr->length) {
+			const u8 *pl = (const u8 *)hdr + sizeof(*hdr);
+			u32 n = min_t(u32, hdr->length, 64);
+			char dump[256];
+			int o = 0;
+			u32 i;
+
+			for (i = 0; i < n; i += 4) {
+				u32 v = 0;
+
+				memcpy(&v, pl + i, 4);
+				o += snprintf(dump + o, sizeof(dump) - o,
+					      "%08x ", v);
+			}
+			nv_vgpu_info(ctx->vgpu,
+				     "vgsp-rm:   unknown fn=%u seq=%u len=%u payload: %s",
+				     function, sequence, hdr->length, dump);
+		}
 		if (gsp_rm_send(ctx, function, sequence, 0, NULL, 0))
 			nv_vgpu_err(ctx->vgpu, "vgsp-rm: reply send failed fn=%u", function);
 		else