From fc34cf9b200bef1e27c2599e898d1eba4803091c Mon Sep 17 00:00:00 2001
From: Michael Scire <SciresM@gmail.com>
Date: Wed, 27 Dec 2023 23:17:52 -0700
Subject: [PATCH] kern: allow ktrace map capability when ktrace is disabled

---
 libmesosphere/source/kern_k_capabilities.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libmesosphere/source/kern_k_capabilities.cpp b/libmesosphere/source/kern_k_capabilities.cpp
index 6b2c6f4b..feb245ed 100644
--- a/libmesosphere/source/kern_k_capabilities.cpp
+++ b/libmesosphere/source/kern_k_capabilities.cpp
@@ -184,6 +184,11 @@ namespace ams::kern {
                 case RegionType::NoMapping:
                     break;
                 case RegionType::KernelTraceBuffer:
+                    /* NOTE: This does not match official, but is used to make pre-processing hbl capabilities in userland unnecessary. */
+                    /* If ktrace isn't enabled, allow ktrace to succeed without mapping anything. */
+                    if constexpr (!ams::kern::IsKTraceEnabled) {
+                        break;
+                    }
                 case RegionType::OnMemoryBootImage:
                 case RegionType::DTB:
                     R_TRY(f(MemoryRegions[static_cast<u32>(type)], perm));