[Buildroot] [PATCH v5 0/9] kvm-unit-tests: update deps and fine tune qemu

[Buildroot] [PATCH v5 0/9] kvm-unit-tests: update deps and fine tune qemu

[Alex Bennée]

The kvm-unit-tests recipe is a little out of date with the
dependencies it needs. With that and some tweaking of the of processor
dependencies we can now build kvm-unit-tests for arm64.

As kvm-unit-tests need the libc utils and I use external tooling I
added support for that.

On the way I've added some new config options for QEMU so you can just
select your native, kvm-only QEMU build.

For Arm we can also run with kvmtool so I've added an option to enable
that.

Finally I've added a simple test case for the kvm-unit-tests package.

For v5
  - more r-b tags
  - addressed comments (see commits)

For v4
  - re-base
  - update kvm-unit-tests to v2025-07-31

For v3
  - add r-b tags
  - update kvm-unit-tests to current master
  - update kvmtool
  - enable kvmtool as alternative to QEMU

For v2
  - addressed review comments
  - added external libc util support
  - added test case
  - ran and addressed linter warnings

Alex.

Alex Bennée (9):
  toolchain/external: allow installing of libc utils
  package/kvm-unit-tests: assume AArch64 supports KVM
  package/kvm-unit-tests: update dependencies
  package/qemu: introduce kvm and tcg system options
  package/kvm-unit-tests: bump to v2025-07-31
  package/kvm-unit-tests: honour BR2_ARM64_PAGE_SIZE
  support/testing: add test for kvm-unit-tests
  package/kvmtool: bump to current HEAD
  package/kvm-unit-tests: allow kvmtool to be used

 board/qemu/aarch64-virt/linux.config          |  2 +
 package/kvm-unit-tests/Config.in              | 37 +++++++++----
 package/kvm-unit-tests/kvm-unit-tests.hash    |  2 +-
 package/kvm-unit-tests/kvm-unit-tests.mk      | 21 +++++++-
 ...e-h-inclusion-for-musl-compatibility.patch | 52 -------------------
 package/kvmtool/kvmtool.hash                  |  2 +-
 package/kvmtool/kvmtool.mk                    |  2 +-
 package/qemu/Config.in                        | 23 ++++++--
 package/qemu/qemu.mk                          | 14 ++++-
 support/testing/tests/package/test_kvm.py     | 47 +++++++++++++++++
 toolchain/toolchain-external/Config.in        |  7 +++
 .../pkg-toolchain-external.mk                 | 24 +++++++++
 12 files changed, 162 insertions(+), 71 deletions(-)
 delete mode 100644 package/kvmtool/0001-remove-wordsize-h-inclusion-for-musl-compatibility.patch
 create mode 100644 support/testing/tests/package/test_kvm.py

-- 
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[Buildroot] [PATCH v5 1/9] toolchain/external: allow installing of libc utils

[Alex Bennée]

For buildroot's own tools we have BR2_PACKAGE_GLIBC_UTILS (and similar
for ulibc). As we need the tools for somethings we should also support
this for external toolchains.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 toolchain/toolchain-external/Config.in        |  7 ++++++
 .../pkg-toolchain-external.mk                 | 24 +++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/toolchain/toolchain-external/Config.in b/toolchain/toolchain-external/Config.in
index 831387bc4e..e79dafa365 100644
--- a/toolchain/toolchain-external/Config.in
+++ b/toolchain/toolchain-external/Config.in
@@ -125,4 +125,11 @@ config BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY
 	  Copy the gdbserver provided by the external toolchain to the
 	  target.
 
+config BR2_TOOLCHAIN_EXTERNAL_LIBC_UTILS_COPY
+	bool "Install libc utilities"
+	depends on BR2_TOOLCHAIN_EXTERNAL
+	help
+	  Enabling this option will compile and install the getconf,
+	  ldd and locale gibc utilities for the target.
+
 endif # BR2_TOOLCHAIN_EXTERNAL
diff --git a/toolchain/toolchain-external/pkg-toolchain-external.mk b/toolchain/toolchain-external/pkg-toolchain-external.mk
index 2c2afa76c0..4281c240af 100644
--- a/toolchain/toolchain-external/pkg-toolchain-external.mk
+++ b/toolchain/toolchain-external/pkg-toolchain-external.mk
@@ -450,6 +450,29 @@ define TOOLCHAIN_EXTERNAL_INSTALL_TARGET_GDBSERVER
 endef
 endif
 
+ifeq ($(BR2_TOOLCHAIN_EXTERNAL_LIBC_UTILS_COPY),y)
+define TOOLCHAIN_EXTERNAL_INSTALL_TARGET_LIBC_UTILS
+	$(Q)$(call MESSAGE,"Copying libc utils")
+	$(Q)ARCH_SYSROOT_DIR="$(call toolchain_find_sysroot,$(TOOLCHAIN_EXTERNAL_CC) $(TOOLCHAIN_EXTERNAL_CFLAGS))" ; \
+	utils_found=0 ; \
+	for d in $${ARCH_SYSROOT_DIR} \
+	         $${ARCH_SYSROOT_DIR}/usr \
+		 $(TOOLCHAIN_EXTERNAL_INSTALL_DIR); do \
+		if test -f $${d}/bin/getconf ; then \
+			for f in getconf ldd locale; do \
+				install -m 0755 -D $${d}/bin/$${f} $(TARGET_DIR)/usr/bin ; \
+			done ; \
+			utils_found=1 ; \
+			break ; \
+		fi ; \
+	done ; \
+	if [ $${utils_found} -eq 0 ] ; then \
+		echo "Could not find libc utils in external toolchain" ; \
+		exit 1 ; \
+	fi
+endef
+endif
+
 define TOOLCHAIN_EXTERNAL_INSTALL_SYSROOT_LIBS
 	$(Q)SYSROOT_DIR="$(call toolchain_find_sysroot,$(TOOLCHAIN_EXTERNAL_CC))" ; \
 	ARCH_SYSROOT_DIR="$(call toolchain_find_sysroot,$(TOOLCHAIN_EXTERNAL_CC) $(TOOLCHAIN_EXTERNAL_CFLAGS))" ; \
@@ -631,6 +654,7 @@ endef
 define $(2)_INSTALL_TARGET_CMDS
 	$$(TOOLCHAIN_EXTERNAL_CREATE_TARGET_LIB_SYMLINK)
 	$$(TOOLCHAIN_EXTERNAL_INSTALL_TARGET_LIBS)
+	$$(TOOLCHAIN_EXTERNAL_INSTALL_TARGET_LIBC_UTILS)
 	$$(TOOLCHAIN_EXTERNAL_INSTALL_TARGET_GDBSERVER)
 	$$(TOOLCHAIN_EXTERNAL_FIXUP_UCLIBCNG_LDSO)
 	$$(TOOLCHAIN_EXTERNAL_INSTALL_TARGET_LDD)
-- 
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[Buildroot] [PATCH v5 2/9] package/kvm-unit-tests: assume AArch64 supports KVM

[Alex Bennée]

Although it is possible to configure an AArch64 CPU without support
for EL2 in practice all the common AArch64 have supported
virtualisation from the start.

If we really wanted to be strict we could blacklist known non-EL2 CPUs
but AFAICT all the current ones in the config have EL2.

I should also note KVM on Arm is deprecated and was removed from the
kernel in v6.10.

Reviewed-by: Jesse Taube <jesse@rivosinc.com>
Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
v2
  - leave BR2_cortex_a76 and BR2_cortex_a76_a55 in place as can be
  used with arm32
v3
  - r-b
v4
  - rebase fixes
---
 package/kvm-unit-tests/Config.in | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/package/kvm-unit-tests/Config.in b/package/kvm-unit-tests/Config.in
index 0d66a08dd7..7538361df4 100644
--- a/package/kvm-unit-tests/Config.in
+++ b/package/kvm-unit-tests/Config.in
@@ -1,13 +1,13 @@
 config BR2_PACKAGE_KVM_UNIT_TESTS_ARCH_SUPPORTS
 	bool
 	# On ARM, it needs virtualization extensions and little endian CPUs
-	default y if (BR2_arm || BR2_aarch64) && \
+	default y if BR2_arm && \
 		(BR2_cortex_a7 || BR2_cortex_a12 || \
 		BR2_cortex_a15 || BR2_cortex_a15_a7 || \
 		BR2_cortex_a17 || BR2_cortex_a17_a7 || \
-		BR2_cortex_a55 || BR2_cortex_a75 || \
-		BR2_cortex_a75_a55 || BR2_cortex_a76 || \
-		BR2_cortex_a76_a55)
+		BR2_cortex_a76 || BR2_cortex_a76_a55 )
+	# For AArch64 we can assume all v8.0+ support virtualization
+	default y if BR2_aarch64
 	default y if BR2_riscv
 	default y if BR2_i386 || BR2_x86_64
 	default y if BR2_powerpc64 || BR2_powerpc64le
-- 
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[Buildroot] [PATCH v5 3/9] package/kvm-unit-tests: update dependencies

[Alex Bennée]

To run the tests we need a system QEMU, timeout, getconf and nmap-ncat
so update the select/depends for them. As we need at least GCC 8 we
can drop the specific requirement for old x86-64 tests.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
v2
  - remove old gcc notes as we need at least 8 anyway
  - select QEMU and other runtime deps
  - mention the runtime deps
  - add support for getconf from external toolchain
  - update comment fallback
v5
  - keep i386/x86-64 target/host comments
  - add !BR2_PACKAGE_QEMU_ARCH_SUPPORTS_TARGET to comment deps
---
 package/kvm-unit-tests/Config.in | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/package/kvm-unit-tests/Config.in b/package/kvm-unit-tests/Config.in
index 7538361df4..0fef94776c 100644
--- a/package/kvm-unit-tests/Config.in
+++ b/package/kvm-unit-tests/Config.in
@@ -16,11 +16,20 @@ config BR2_PACKAGE_KVM_UNIT_TESTS_ARCH_SUPPORTS
 config BR2_PACKAGE_KVM_UNIT_TESTS
 	bool "kvm-unit-tests"
 	depends on BR2_PACKAGE_KVM_UNIT_TESTS_ARCH_SUPPORTS
-	# on i386 and x86-64, __builtin_reachable is used, so we need
-	# gcc 4.5 at least. on i386, we use the target gcc, while on
+	# On i386, we use the target gcc, while on
 	# x86-64 we use the host gcc (see .mk file for details)
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_5 || !BR2_i386
 	depends on BR2_HOSTARCH = "x86_64" || !BR2_x86_64
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_8 # qemu
+	depends on BR2_PACKAGE_QEMU_ARCH_SUPPORTS_TARGET
+	depends on (BR2_PACKAGE_GLIBC_UTILS || \
+		    BR2_UCLIBC_INSTALL_UTILS || \
+		    BR2_TOOLCHAIN_EXTERNAL_LIBC_UTILS_COPY) # runtime getconf
+	select BR2_PACKAGE_QEMU
+	select BR2_PACKAGE_QEMU_SYSTEM # runtime for qemu-system-$ARCH
+	select BR2_PACKAGE_COREUTILS # runtime for timeout
+	select BR2_PACKAGE_BASH # runtime
+	select BR2_PACKAGE_NMAP
+	select BR2_PACKAGE_NMAP_NCAT # runtime for ncat
 	select BR2_HOSTARCH_NEEDS_IA32_COMPILER if BR2_x86_64
 	help
 	  kvm-unit-tests is a project as old as KVM. As its name
@@ -40,6 +49,10 @@ config BR2_PACKAGE_KVM_UNIT_TESTS
 
 	  http://www.linux-kvm.org/page/KVM-unit-tests
 
-comment "kvm-unit-tests needs a toolchain w/ gcc >= 4.5"
+comment "kvm-unit-tests needs a toolchain w/ utils, gcc >= 8 and qemu"
 	depends on BR2_i386
-	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
+	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_8
+	depends on !(BR2_PACKAGE_GLIBC_UTILS || \
+		BR2_UCLIBC_INSTALL_UTILS || \
+		BR2_TOOLCHAIN_EXTERNAL_LIBC_UTILS_COPY)
+	depends on !BR2_PACKAGE_QEMU_ARCH_SUPPORTS_TARGET
-- 
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[Buildroot] [PATCH v5 4/9] package/qemu: introduce kvm and tcg system options

[Alex Bennée]

When building system binaries you may not even want TCG support if you
are only intending to use KVM. Provide the options so the user can
select only what they need.

With only KVM selected the QEMU build will generally only build the
binary for your target system. We keep TCG support on by default so as
not to break existing defconfigs.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
v2
  - clean-up whitespace
  - default TCG=y
  - fix typos
  - drop --enable-kvm from default configure list
---
 package/qemu/Config.in | 23 ++++++++++++++++++-----
 package/qemu/qemu.mk   | 14 +++++++++++++-
 2 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/package/qemu/Config.in b/package/qemu/Config.in
index ff7423bc4c..ad53f133e3 100644
--- a/package/qemu/Config.in
+++ b/package/qemu/Config.in
@@ -59,6 +59,20 @@ config BR2_PACKAGE_QEMU_SYSTEM
 
 if BR2_PACKAGE_QEMU_SYSTEM
 
+config BR2_PACKAGE_QEMU_SYSTEM_KVM
+	bool "Enable KVM system virtualisation"
+	default y
+	help
+	  Say 'y' here to enable a QEMU with KVM support.
+	  If unsure, say 'y'
+
+config BR2_PACKAGE_QEMU_SYSTEM_TCG
+	bool "Enable TCG system emulation"
+	default y
+	help
+	  Say 'y' here to enable QEMU binaries which can emulate foreign
+	  architectures using the TCG JIT.
+
 config BR2_PACKAGE_QEMU_BLOBS
 	bool "Install binary blobs"
 	default y
@@ -130,12 +144,11 @@ config BR2_PACKAGE_QEMU_LINUX_USER
 
 config BR2_PACKAGE_QEMU_CHOOSE_TARGETS
 	bool "Select individual emulator targets"
-	depends on BR2_PACKAGE_QEMU_SYSTEM || BR2_PACKAGE_QEMU_LINUX_USER
+	depends on BR2_PACKAGE_QEMU_SYSTEM_TCG || BR2_PACKAGE_QEMU_LINUX_USER
 	help
-	  By default, all targets (system and/or user, subject to the
-	  corresponding options, above) are built. If you only need a
-	  subset of the emulated targets, say 'y' here and enable at
-	  least one target, below.
+	  By default, all targets system targets are built when TCG is
+	  enabled. If you only need a subset of the emulated targets,
+	  say 'y' here and enable at least one target, below.
 
 if BR2_PACKAGE_QEMU_CHOOSE_TARGETS
 
diff --git a/package/qemu/qemu.mk b/package/qemu/qemu.mk
index fdc8591e54..5e63166545 100644
--- a/package/qemu/qemu.mk
+++ b/package/qemu/qemu.mk
@@ -48,6 +48,19 @@ QEMU_VARS = LIBTOOL=$(HOST_DIR)/bin/libtool
 ifeq ($(BR2_PACKAGE_QEMU_SYSTEM),y)
 QEMU_DEPENDENCIES += pixman
 QEMU_OPTS += --enable-system
+
+ifeq ($(BR2_PACKAGE_QEMU_SYSTEM_KVM), y)
+QEMU_OPTS += --enable-kvm
+else
+QEMU_OPTS += --disable-kvm
+endif
+
+ifeq ($(BR2_PACKAGE_QEMU_SYSTEM_TCG), y)
+QEMU_OPTS += --enable-tcg
+else
+QEMU_OPTS += --disable-tcg
+endif
+
 QEMU_TARGET_LIST_$(BR2_PACKAGE_QEMU_TARGET_AARCH64) += aarch64-softmmu
 QEMU_TARGET_LIST_$(BR2_PACKAGE_QEMU_TARGET_ALPHA) += alpha-softmmu
 QEMU_TARGET_LIST_$(BR2_PACKAGE_QEMU_TARGET_ARM) += arm-softmmu
@@ -326,7 +339,6 @@ define QEMU_CONFIGURE_CMDS
 			--disable-whpx \
 			--disable-xen \
 			--enable-attr \
-			--enable-kvm \
 			--enable-vhost-net \
 			--disable-download \
 			--disable-hexagon-idef-parser \
-- 
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[Buildroot] [PATCH v5 5/9] package/kvm-unit-tests: bump to v2025-07-31

[Alex Bennée]

Update to the current version of KVM unit tests. The main change
since the last check point is support for kvmtool to launch tests.

Reviewed-by: Jesse Taube <jesse@rivosinc.com>
Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
v3
  - reword commit
  - move to current master so we can use kvmtool as well
  - didn't apply th_huth's r-b as moved to master
v4
  - change from snapshot to v2025-07-31
  - reword commit message again
---
 package/kvm-unit-tests/kvm-unit-tests.hash | 2 +-
 package/kvm-unit-tests/kvm-unit-tests.mk   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/kvm-unit-tests/kvm-unit-tests.hash b/package/kvm-unit-tests/kvm-unit-tests.hash
index ad0922df59..6fb7dea2c6 100644
--- a/package/kvm-unit-tests/kvm-unit-tests.hash
+++ b/package/kvm-unit-tests/kvm-unit-tests.hash
@@ -1,4 +1,4 @@
 # Locally computed
-sha256  60015b023f34261c134d714f4670926ac81483e286a16475eb4a5cedab00eefa  kvm-unit-tests-v2025-06-05.tar.bz2
+sha256  8052e1f70bfb3b0c894b8ef71e3847f533b3d957277dd04b3270f33332d4170b  kvm-unit-tests-v2025-07-31.tar.bz2
 sha256  b3c9ca9e257f2eaae070cf0ccdf8770764f05a947a39a835e633413750a5777b  COPYRIGHT
 sha256  8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  LICENSE
diff --git a/package/kvm-unit-tests/kvm-unit-tests.mk b/package/kvm-unit-tests/kvm-unit-tests.mk
index 1ed902b1a0..1d7eec2d21 100644
--- a/package/kvm-unit-tests/kvm-unit-tests.mk
+++ b/package/kvm-unit-tests/kvm-unit-tests.mk
@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-KVM_UNIT_TESTS_VERSION = 2025-06-05
+KVM_UNIT_TESTS_VERSION = 2025-07-31
 KVM_UNIT_TESTS_SOURCE = kvm-unit-tests-v$(KVM_UNIT_TESTS_VERSION).tar.bz2
 KVM_UNIT_TESTS_SITE = https://gitlab.com/kvm-unit-tests/kvm-unit-tests/-/archive/v$(KVM_UNIT_TESTS_VERSION)
 KVM_UNIT_TESTS_LICENSE = GPL-2.0, LGPL-2.0
-- 
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[Buildroot] [PATCH v5 6/9] package/kvm-unit-tests: honour BR2_ARM64_PAGE_SIZE

[Alex Bennée]

The latest kvm-unit-tests defaults to 4k but there is no reason why we
shouldn't honour the system page size if it is set.

Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 package/kvm-unit-tests/kvm-unit-tests.mk | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/package/kvm-unit-tests/kvm-unit-tests.mk b/package/kvm-unit-tests/kvm-unit-tests.mk
index 1d7eec2d21..efc3c859aa 100644
--- a/package/kvm-unit-tests/kvm-unit-tests.mk
+++ b/package/kvm-unit-tests/kvm-unit-tests.mk
@@ -40,6 +40,14 @@ KVM_UNIT_TESTS_CONF_OPTS =\
 	--processor="$(GCC_TARGET_CPU)" \
 	--endian="$(KVM_UNIT_TESTS_ENDIAN)"
 
+ifeq ($(BR2_ARM64_PAGE_SIZE_4K),y)
+KVM_UNIT_TESTS_CONF_OPTS += --page-size=4k
+else ifeq ($(BR2_ARM64_PAGE_SIZE_16K),y)
+KVM_UNIT_TESTS_CONF_OPTS += --page-size=16k
+else ifeq ($(BR2_ARM64_PAGE_SIZE_64K),y)
+KVM_UNIT_TESTS_CONF_OPTS += --page-size=64k
+endif
+
 # For all architectures but x86-64, we use the target
 # compiler. However, for x86-64, we use the host compiler, as
 # kvm-unit-tests builds 32 bit code, which Buildroot toolchains for
-- 
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[Buildroot] [PATCH v5 7/9] support/testing: add test for kvm-unit-tests

[Alex Bennée]

Now we have updated kvm-unit-tests we should defend it with a test. To
support that enable KVM in the qemu kernel config and boot an image
where we can run the basic tests.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 board/qemu/aarch64-virt/linux.config      |  2 +
 support/testing/tests/package/test_kvm.py | 47 +++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 support/testing/tests/package/test_kvm.py

diff --git a/board/qemu/aarch64-virt/linux.config b/board/qemu/aarch64-virt/linux.config
index 971b9fcf86..9d1934c648 100644
--- a/board/qemu/aarch64-virt/linux.config
+++ b/board/qemu/aarch64-virt/linux.config
@@ -74,3 +74,5 @@ CONFIG_VIRTIO_FS=y
 CONFIG_OVERLAY_FS=y
 CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_VIRTUALIZATION=y
+CONFIG_KVM=y
diff --git a/support/testing/tests/package/test_kvm.py b/support/testing/tests/package/test_kvm.py
new file mode 100644
index 0000000000..da5ebfb1b7
--- /dev/null
+++ b/support/testing/tests/package/test_kvm.py
@@ -0,0 +1,47 @@
+import os
+import infra.basetest
+
+KVM_TIMEOUT = 120
+
+
+class TestKVM(infra.basetest.BRTest):
+    config = \
+        """
+        BR2_aarch64=y
+        BR2_cortex_a72=y
+        BR2_TOOLCHAIN_EXTERNAL=y
+        BR2_TOOLCHAIN_EXTERNAL_LIBC_UTILS_COPY=y
+        BR2_OPTIMIZE_S=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        BR2_LINUX_KERNEL=y
+        BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+        BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux.config"
+        BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
+        BR2_PACKAGE_KVM_UNIT_TESTS=y
+        # BR2_PACKAGE_QEMU_SYSTEM_TCG is not set
+        # BR2_PACKAGE_QEMU_BLOBS is not set
+        BR2_TARGET_ROOTFS_EXT2=y
+        """
+
+    def test_run(self):
+        kern = os.path.join(self.builddir, "images", "Image")
+        img = os.path.join(self.builddir, "images", "rootfs.ext2")
+
+        qemu_opts = ["-M", "virt,gic-version=3,virtualization=on",
+                     "-cpu", "cortex-a72",
+                     "-smp", "2",
+                     "-m", "512M",
+                     "-drive", f"file={img},if=virtio,format=raw", "-snapshot"]
+
+        self.emulator.boot(arch="aarch64",
+                           kernel=kern,
+                           kernel_cmdline=["root=/dev/vda console=ttyAMA0"],
+                           options=qemu_opts)
+
+        self.emulator.login()
+
+        # Run the selftests
+        self.assertRunOk("/usr/share/kvm-unit-tests/selftest-setup")
+        self.assertRunOk("/usr/share/kvm-unit-tests/selftest-smp")
+        self.assertRunOk("/usr/share/kvm-unit-tests/selftest-vectors-kernel")
+        self.assertRunOk("/usr/share/kvm-unit-tests/selftest-vectors-user")
-- 
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[Buildroot] [PATCH v5 8/9] package/kvmtool: bump to current HEAD

[Alex Bennée]

By doing so we can also drop the patches for musl which have now been
merged upstream.

Reviewed-by: Jesse Taube <jesse@rivosinc.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 ...e-h-inclusion-for-musl-compatibility.patch | 52 -------------------
 package/kvmtool/kvmtool.hash                  |  2 +-
 package/kvmtool/kvmtool.mk                    |  2 +-
 3 files changed, 2 insertions(+), 54 deletions(-)
 delete mode 100644 package/kvmtool/0001-remove-wordsize-h-inclusion-for-musl-compatibility.patch

diff --git a/package/kvmtool/0001-remove-wordsize-h-inclusion-for-musl-compatibility.patch b/package/kvmtool/0001-remove-wordsize-h-inclusion-for-musl-compatibility.patch
deleted file mode 100644
index 3128a23689..0000000000
--- a/package/kvmtool/0001-remove-wordsize-h-inclusion-for-musl-compatibility.patch
+++ /dev/null
@@ -1,52 +0,0 @@
-From 0592f8f829c843ff5cb2d108c309e32f4f6f5379 Mon Sep 17 00:00:00 2001
-From: Andre Przywara <andre.przywara@arm.com>
-Date: Thu, 1 Aug 2024 12:10:54 +0100
-Subject: remove wordsize.h inclusion (for musl compatibility)
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-The wordsize.h header file and the __WORDSIZE definition do not seem
-to be universal, the musl libc for instance has the definition in a
-different header file. This breaks compilation of kvmtool against musl.
-
-The two leading underscores suggest a compiler-internal symbol anyway, so
-let's just remove that particular macro usage entirely, and replace it
-with the number we really want: the size of a "long" type.
-
-Reported-by: J. Neuschäfer <j.neuschaefer@gmx.net>
-Signed-off-by: Andre Przywara <andre.przywara@arm.com>
-Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
-Link: https://lore.kernel.org/r/20240801111054.818765-1-andre.przywara@arm.com
-Signed-off-by: Will Deacon <will@kernel.org>
-Upstream: https://git.kernel.org/pub/scm/linux/kernel/git/will/kvmtool.git/commit/?id=0592f8f829c843ff5cb2d108c309e32f4f6f5379
-Signed-off-by: Thomas Perale <thomas.perale@mind.be>
----
- include/linux/bitops.h | 6 ++----
- 1 file changed, 2 insertions(+), 4 deletions(-)
-
-diff --git a/include/linux/bitops.h b/include/linux/bitops.h
-index ae33922f..ee8fd560 100644
---- a/include/linux/bitops.h
-+++ b/include/linux/bitops.h
-@@ -1,15 +1,13 @@
- #ifndef _KVM_LINUX_BITOPS_H_
- #define _KVM_LINUX_BITOPS_H_
- 
--#include <bits/wordsize.h>
--
- #include <linux/kernel.h>
- #include <linux/compiler.h>
- #include <asm/hweight.h>
- 
--#define BITS_PER_LONG __WORDSIZE
- #define BITS_PER_BYTE           8
--#define BITS_TO_LONGS(nr)       DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
-+#define BITS_PER_LONG           (BITS_PER_BYTE * sizeof(long))
-+#define BITS_TO_LONGS(nr)       DIV_ROUND_UP(nr, BITS_PER_LONG)
- 
- #define BIT_WORD(nr)		((nr) / BITS_PER_LONG)
- 
--- 
-cgit 1.2.3-korg
-
diff --git a/package/kvmtool/kvmtool.hash b/package/kvmtool/kvmtool.hash
index 63bbb7167c..8df6f929df 100644
--- a/package/kvmtool/kvmtool.hash
+++ b/package/kvmtool/kvmtool.hash
@@ -1,3 +1,3 @@
 # Locally computed
-sha256  a8504d8b184cae4e65ff5555cc84a436f3fbbc832a8017e3ca59d997dd5581db  kvmtool-4d2c017f41533b0e51e00f689050c26190a15318-git4.tar.gz
+sha256  18841c414e82b405a0bd6f5c546bc088becd298c1145a2bac97563e699231925  kvmtool-1117dbc8ceb21abc6e8cd9861450695995852290-git4.tar.gz
 sha256  0d5bf346df9e635a29dcdddf832dc5b002ca6cdc1c5c9c6c567d2a61bb0c5c15  COPYING
diff --git a/package/kvmtool/kvmtool.mk b/package/kvmtool/kvmtool.mk
index 7fec6643f8..f5637e5384 100644
--- a/package/kvmtool/kvmtool.mk
+++ b/package/kvmtool/kvmtool.mk
@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-KVMTOOL_VERSION = 4d2c017f41533b0e51e00f689050c26190a15318
+KVMTOOL_VERSION = 1117dbc8ceb21abc6e8cd9861450695995852290
 KVMTOOL_SITE = https://git.kernel.org/pub/scm/linux/kernel/git/will/kvmtool.git
 KVMTOOL_SITE_METHOD = git
 KVMTOOL_DEPENDENCIES = \
-- 
2.47.3

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[Buildroot] [PATCH v5 9/9] package/kvm-unit-tests: allow kvmtool to be used

[Alex Bennée]

For some targets launching tests with kvmtool is an option which makes
for an even smaller test image. Create a new symbol which can be
expanded with additional targets that will allow the skipping of the
selection of QEMU if not needed.

Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
v2
  - expand to include riscv, didn't bother with 32 bit arm given its deprecated
  - only expand target when arch can support it
  - update comment depends
---
 package/kvm-unit-tests/Config.in         | 12 +++++++++---
 package/kvm-unit-tests/kvm-unit-tests.mk | 11 +++++++++++
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/package/kvm-unit-tests/Config.in b/package/kvm-unit-tests/Config.in
index 0fef94776c..031764e7ca 100644
--- a/package/kvm-unit-tests/Config.in
+++ b/package/kvm-unit-tests/Config.in
@@ -13,6 +13,11 @@ config BR2_PACKAGE_KVM_UNIT_TESTS_ARCH_SUPPORTS
 	default y if BR2_powerpc64 || BR2_powerpc64le
 	default y if BR2_s390x
 
+# Some architectures can use kvmtool instead of QEMU to launch the tests
+config BR2_PACKAGE_KVM_UNIT_TESTS_CAN_USE_KVMTOOL
+	bool
+	default y if (BR2_aarch64 || BR2_riscv) && BR2_PACKAGE_KVMTOOL
+
 config BR2_PACKAGE_KVM_UNIT_TESTS
 	bool "kvm-unit-tests"
 	depends on BR2_PACKAGE_KVM_UNIT_TESTS_ARCH_SUPPORTS
@@ -24,8 +29,8 @@ config BR2_PACKAGE_KVM_UNIT_TESTS
 	depends on (BR2_PACKAGE_GLIBC_UTILS || \
 		    BR2_UCLIBC_INSTALL_UTILS || \
 		    BR2_TOOLCHAIN_EXTERNAL_LIBC_UTILS_COPY) # runtime getconf
-	select BR2_PACKAGE_QEMU
-	select BR2_PACKAGE_QEMU_SYSTEM # runtime for qemu-system-$ARCH
+	select BR2_PACKAGE_QEMU if !BR2_PACKAGE_KVM_UNIT_TESTS_CAN_USE_KVMTOOL
+	select BR2_PACKAGE_QEMU_SYSTEM if !BR2_PACKAGE_KVM_UNIT_TESTS_CAN_USE_KVMTOOL # runtime for qemu-system-$ARCH
 	select BR2_PACKAGE_COREUTILS # runtime for timeout
 	select BR2_PACKAGE_BASH # runtime
 	select BR2_PACKAGE_NMAP
@@ -55,4 +60,5 @@ comment "kvm-unit-tests needs a toolchain w/ utils, gcc >= 8 and qemu"
 	depends on !(BR2_PACKAGE_GLIBC_UTILS || \
 		BR2_UCLIBC_INSTALL_UTILS || \
 		BR2_TOOLCHAIN_EXTERNAL_LIBC_UTILS_COPY)
-	depends on !BR2_PACKAGE_QEMU_ARCH_SUPPORTS_TARGET
+	depends on !(BR2_PACKAGE_QEMU_ARCH_SUPPORTS_TARGET || \
+		BR2_PACKAGE_KVM_UNIT_TESTS_CAN_USE_KVMTOOL)
diff --git a/package/kvm-unit-tests/kvm-unit-tests.mk b/package/kvm-unit-tests/kvm-unit-tests.mk
index efc3c859aa..02191275a2 100644
--- a/package/kvm-unit-tests/kvm-unit-tests.mk
+++ b/package/kvm-unit-tests/kvm-unit-tests.mk
@@ -40,6 +40,17 @@ KVM_UNIT_TESTS_CONF_OPTS =\
 	--processor="$(GCC_TARGET_CPU)" \
 	--endian="$(KVM_UNIT_TESTS_ENDIAN)"
 
+# The default runner is QEMU but kvmtool can also be used on some
+# architectures. The flag only works for those architectures that can
+# support both.
+ifeq ($(BR2_PACKAGE_KVM_UNIT_TESTS_CAN_USE_KVMTOOL), y)
+ifeq ($(BR2_PACKAGE_QEMU_SYSTEM),y)
+KVM_UNIT_TESTS_CONF_OPTS += --target=qemu
+else ifeq ($(BR2_PACKAGE_KVMTOOL),y)
+KVM_UNIT_TESTS_CONF_OPTS += --target=kvmtool
+endif
+endif
+
 ifeq ($(BR2_ARM64_PAGE_SIZE_4K),y)
 KVM_UNIT_TESTS_CONF_OPTS += --page-size=4k
 else ifeq ($(BR2_ARM64_PAGE_SIZE_16K),y)
-- 
2.47.3

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Re: [Buildroot] [PATCH v5 8/9] package/kvmtool: bump to current HEAD

[Julien Olivain via buildroot]

On 11/09/2025 23:27, Alex Bennée wrote:
> By doing so we can also drop the patches for musl which have now been
> merged upstream.
> 
> Reviewed-by: Jesse Taube <jesse@rivosinc.com>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Applied to master, thanks.
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Re: [Buildroot] [PATCH v5 4/9] package/qemu: introduce kvm and tcg system options

[Thomas Petazzoni via buildroot]

Hello Alex,

We have finally applied your patch, with a few tweaks, see below.

On Thu, Sep 11, 2025 at 10:27:44PM +0100, Alex Bennée wrote:
>  if BR2_PACKAGE_QEMU_SYSTEM
>  
> +config BR2_PACKAGE_QEMU_SYSTEM_KVM
> +	bool "Enable KVM system virtualisation"
> +	default y
> +	help
> +	  Say 'y' here to enable a QEMU with KVM support.
> +	  If unsure, say 'y'
> +
> +config BR2_PACKAGE_QEMU_SYSTEM_TCG
> +	bool "Enable TCG system emulation"
> +	default y
> +	help
> +	  Say 'y' here to enable QEMU binaries which can emulate foreign
> +	  architectures using the TCG JIT.

If both options are disabled, no qemu binary is built at all. The
build doesn't fail, but it means that existing packages, such as
libvirt that select qemu + qemu-system might be confused. So we've
added a select BR2_PACKAGE_QEMU_SYSTEM_TCG if
!BR2_PACKAGE_QEMU_SYSTEM_KVM under the BR2_PACKAGE_QEMU_SYSTEM option,
ensuring that at least one of the two gets enabled.

>  config BR2_PACKAGE_QEMU_CHOOSE_TARGETS
>  	bool "Select individual emulator targets"
> -	depends on BR2_PACKAGE_QEMU_SYSTEM || BR2_PACKAGE_QEMU_LINUX_USER
> +	depends on BR2_PACKAGE_QEMU_SYSTEM_TCG || BR2_PACKAGE_QEMU_LINUX_USER
>  	help
> -	  By default, all targets (system and/or user, subject to the
> -	  corresponding options, above) are built. If you only need a
> -	  subset of the emulated targets, say 'y' here and enable at
> -	  least one target, below.
> +	  By default, all targets system targets are built when TCG is

This updated only accounted for TCG, but this option also appears for
user-mode emulation. So we've simplified since to "By default, all
system targets are built".

Applied with those changes, thanks!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] [PATCH v5 2/9] package/kvm-unit-tests: assume AArch64 supports KVM

[Thomas Perale via buildroot]

In reply of:
> Although it is possible to configure an AArch64 CPU without support
> for EL2 in practice all the common AArch64 have supported
> virtualisation from the start.
> 
> If we really wanted to be strict we could blacklist known non-EL2 CPUs
> but AFAICT all the current ones in the config have EL2.
> 
> I should also note KVM on Arm is deprecated and was removed from the
> kernel in v6.10.
> 
> Reviewed-by: Jesse Taube <jesse@rivosinc.com>
> Reviewed-by: Thomas Huth <huth@tuxfamily.org>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> 

Applied to 2025.11.x. Thanks

> ---
> v2
>   - leave BR2_cortex_a76 and BR2_cortex_a76_a55 in place as can be
>   used with arm32
> v3
>   - r-b
> v4
>   - rebase fixes
> ---
>  package/kvm-unit-tests/Config.in | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/package/kvm-unit-tests/Config.in b/package/kvm-unit-tests/Config.in
> index 0d66a08dd7..7538361df4 100644
> --- a/package/kvm-unit-tests/Config.in
> +++ b/package/kvm-unit-tests/Config.in
> @@ -1,13 +1,13 @@
>  config BR2_PACKAGE_KVM_UNIT_TESTS_ARCH_SUPPORTS
>  	bool
>  	# On ARM, it needs virtualization extensions and little endian CPUs
> -	default y if (BR2_arm || BR2_aarch64) && \
> +	default y if BR2_arm && \
>  		(BR2_cortex_a7 || BR2_cortex_a12 || \
>  		BR2_cortex_a15 || BR2_cortex_a15_a7 || \
>  		BR2_cortex_a17 || BR2_cortex_a17_a7 || \
> -		BR2_cortex_a55 || BR2_cortex_a75 || \
> -		BR2_cortex_a75_a55 || BR2_cortex_a76 || \
> -		BR2_cortex_a76_a55)
> +		BR2_cortex_a76 || BR2_cortex_a76_a55 )
> +	# For AArch64 we can assume all v8.0+ support virtualization
> +	default y if BR2_aarch64
>  	default y if BR2_riscv
>  	default y if BR2_i386 || BR2_x86_64
>  	default y if BR2_powerpc64 || BR2_powerpc64le
> -- 
> 2.47.3
> 
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