From 6c02bfefa5ed337e73c311ac6e88738274058b5b Mon Sep 17 00:00:00 2001
From: Langston Barrett <langston.barrett@gmail.com>
Date: Thu, 14 May 2026 10:12:51 -0400
Subject: [PATCH] feat(qemu): Feature for enabling `virtfs`

---
 crates/libafl_qemu/Cargo.toml                     |  4 ++++
 crates/libafl_qemu/libafl_qemu_build/Cargo.toml   |  1 +
 crates/libafl_qemu/libafl_qemu_build/src/build.rs | 12 ++++++++++--
 crates/libafl_qemu/libafl_qemu_sys/Cargo.toml     |  4 ++++
 4 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/crates/libafl_qemu/Cargo.toml b/crates/libafl_qemu/Cargo.toml
index 95ae73e3cfe..5db6f32cb21 100644
--- a/crates/libafl_qemu/Cargo.toml
+++ b/crates/libafl_qemu/Cargo.toml
@@ -99,6 +99,10 @@ slirp = [
   "systemmode",
   "libafl_qemu_sys/slirp",
 ] # build qemu with host libslirp (for user networking)
+virtfs = [
+  "systemmode",
+  "libafl_qemu_sys/virtfs",
+] # build qemu with virtfs support (for host directory sharing)
 
 intel_pt = ["systemmode", "x86_64", "dep:libafl_intelpt"]
 intel_pt_export_raw = ["intel_pt", "libafl_intelpt/export_raw"]
diff --git a/crates/libafl_qemu/libafl_qemu_build/Cargo.toml b/crates/libafl_qemu/libafl_qemu_build/Cargo.toml
index 9ac22184f65..c6a715c173d 100644
--- a/crates/libafl_qemu/libafl_qemu_build/Cargo.toml
+++ b/crates/libafl_qemu/libafl_qemu_build/Cargo.toml
@@ -26,6 +26,7 @@ all-features = true
 [features]
 shared = []
 slirp = []  # build qemu with host libslirp (for user networking)
+virtfs = [] # build qemu with virtfs support (for host directory sharing)
 
 clippy = [] # special feature for clippy, don't use in normal projects§
 
diff --git a/crates/libafl_qemu/libafl_qemu_build/src/build.rs b/crates/libafl_qemu/libafl_qemu_build/src/build.rs
index 687d56f8d8a..d8c4a7ed142 100644
--- a/crates/libafl_qemu/libafl_qemu_build/src/build.rs
+++ b/crates/libafl_qemu/libafl_qemu_build/src/build.rs
@@ -117,7 +117,11 @@ fn configure_qemu(
         .arg("--audio-drv-list=")
         .arg("--disable-af-xdp")
         .arg("--disable-alsa")
-        .arg("--disable-attr")
+        .arg(if cfg!(feature = "virtfs") {
+            "--enable-attr"
+        } else {
+            "--disable-attr"
+        })
         .arg("--disable-auth-pam")
         .arg("--disable-dbus-display")
         .arg("--disable-bochs")
@@ -207,7 +211,11 @@ fn configure_qemu(
         .arg("--disable-vhost-user-blk-server")
         .arg("--disable-vhost-vdpa")
         .arg("--disable-virglrenderer")
-        .arg("--disable-virtfs")
+        .arg(if cfg!(feature = "virtfs") {
+            "--enable-virtfs"
+        } else {
+            "--disable-virtfs"
+        })
         .arg("--disable-vmnet")
         .arg("--disable-vnc")
         .arg("--disable-vnc-jpeg")
diff --git a/crates/libafl_qemu/libafl_qemu_sys/Cargo.toml b/crates/libafl_qemu/libafl_qemu_sys/Cargo.toml
index 6a127a9159b..f9e79ff4a3f 100644
--- a/crates/libafl_qemu/libafl_qemu_sys/Cargo.toml
+++ b/crates/libafl_qemu/libafl_qemu_sys/Cargo.toml
@@ -50,6 +50,10 @@ slirp = [
   "systemmode",
   "libafl_qemu_build/slirp",
 ] # build qemu with host libslirp (for user networking)
+virtfs = [
+  "systemmode",
+  "libafl_qemu_build/virtfs",
+] # build qemu with virtfs support (for host directory sharing)
 shared = ["libafl_qemu_build/shared"]
 
 # special feature for clippy, don't use in normal projects