[Buildroot] [PATCH 1/3] configs/qemu: Add a ppc64le-powernv8 configuration

[Buildroot] [PATCH 1/3] configs/qemu: Add a ppc64le-powernv8 configuration

[Cédric Le Goater]

PowerNV is the platform using the OPAL [1] firmware on OpenPOWER
systems. OPAL first loads a kernel and an initramfs image based on
buildroot including a second boot loader petitboot [2]. The latter
does device discovery and kexecs a new Linux image from disk or
network.

QEMU implements PowerNV machines [3] for the POWER8, POWER9 and
Power10 processors which are used for dev and tests. POWER8 images
being compatible with POWER9 and Power10, simply add a single
qemu_ppc64le_powernv8 board for all.

The QEMU script boots directly from a nvme disk because it is simple
enough but a real system would boot from a ramfs first.

[1] https://github.com/open-power/skiboot/blob/master/doc/overview.rst
[2] https://github.com/open-power/petitboot/
[3] https://qemu.readthedocs.io/en/latest/system/ppc/powernv.html

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 board/qemu/ppc64le-powernv8/readme.txt  |  5 +++++
 configs/qemu_ppc64le_powernv8_defconfig | 29 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 board/qemu/ppc64le-powernv8/readme.txt
 create mode 100644 configs/qemu_ppc64le_powernv8_defconfig

diff --git a/board/qemu/ppc64le-powernv8/readme.txt b/board/qemu/ppc64le-powernv8/readme.txt
new file mode 100644
index 000000000000..059f55fbc917
--- /dev/null
+++ b/board/qemu/ppc64le-powernv8/readme.txt
@@ -0,0 +1,5 @@
+Run the emulation with:
+
+qemu-system-ppc64 -M powernv9 -kernel vmlinux -append "console=hvc0 rootwait root=/dev/nvme0n1" -device nvme,bus=pcie.3,addr=0x0,drive=drive0,serial=1234 -drive file=./rootfs.ext2,if=none,id=drive0,format=raw,cache=none -device e1000e,netdev=net0,mac=C0:FF:EE:00:01:03,bus=pcie.1,addr=0x0  -netdev user,id=net0 -serial mon:stdio -nographic # qemu_ppc64le_powernv8_defconfig
+
+The login prompt will appear in the terminal window.
diff --git a/configs/qemu_ppc64le_powernv8_defconfig b/configs/qemu_ppc64le_powernv8_defconfig
new file mode 100644
index 000000000000..d8ea6655fce0
--- /dev/null
+++ b/configs/qemu_ppc64le_powernv8_defconfig
@@ -0,0 +1,29 @@
+# Architecture
+BR2_powerpc64le=y
+BR2_powerpc_power8=y
+
+# System
+BR2_TARGET_GENERIC_GETTY_PORT="hvc0"
+BR2_SYSTEM_DHCP="eth0"
+
+# Filesystem
+BR2_TARGET_ROOTFS_EXT2=y
+# BR2_TARGET_ROOTFS_TAR is not set
+
+# Image
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/qemu/post-image.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="$(BR2_DEFCONFIG)"
+
+# Linux headers same as kernel
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15"
+BR2_LINUX_KERNEL_DEFCONFIG="powernv"
+BR2_LINUX_KERNEL_VMLINUX=y
+
+# host-qemu for gitlab testing
+BR2_PACKAGE_HOST_QEMU=y
+BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y
-- 
2.31.1

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[Buildroot] [PATCH 2/3] configs/qemu: Add a ppc-bamboo configuration

[Cédric Le Goater]

The Bamboo board is an evaluation board for PowerPC 440EP CPUs.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 board/qemu/ppc-bamboo/linux.fragment |  6 +++++
 board/qemu/ppc-bamboo/readme.txt     |  5 ++++
 configs/qemu_ppc_bamboo_defconfig    | 36 ++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+)
 create mode 100644 board/qemu/ppc-bamboo/linux.fragment
 create mode 100644 board/qemu/ppc-bamboo/readme.txt
 create mode 100644 configs/qemu_ppc_bamboo_defconfig

diff --git a/board/qemu/ppc-bamboo/linux.fragment b/board/qemu/ppc-bamboo/linux.fragment
new file mode 100644
index 000000000000..cc272d0541f0
--- /dev/null
+++ b/board/qemu/ppc-bamboo/linux.fragment
@@ -0,0 +1,6 @@
+# Enable virtio (blk, rng and net devices)
+CONFIG_VIRTIO=y
+CONFIG_VIRTIO_PCI=y
+CONFIG_HW_RANDOM_VIRTIO=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_VIRTIO_NET=y
diff --git a/board/qemu/ppc-bamboo/readme.txt b/board/qemu/ppc-bamboo/readme.txt
new file mode 100644
index 000000000000..0b70d2fa5443
--- /dev/null
+++ b/board/qemu/ppc-bamboo/readme.txt
@@ -0,0 +1,5 @@
+Run the emulation with:
+
+qemu-system-ppc -nographic -M bamboo -kernel vmlinux -net nic,model=virtio-net-pci -net user # qemu_ppc_bamboo_defconfig
+
+The login prompt will appear in the terminal that started Qemu.
diff --git a/configs/qemu_ppc_bamboo_defconfig b/configs/qemu_ppc_bamboo_defconfig
new file mode 100644
index 000000000000..d6abbeb45296
--- /dev/null
+++ b/configs/qemu_ppc_bamboo_defconfig
@@ -0,0 +1,36 @@
+# Architecture
+BR2_powerpc=y
+BR2_powerpc_440fp=y
+
+# System
+BR2_SYSTEM_DHCP="eth0"
+
+# Filesystem
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_TARGET_ROOTFS_INITRAMFS=y
+
+# Image
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/qemu/post-image.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="$(BR2_DEFCONFIG)"
+
+# Linux headers same as kernel
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15"
+BR2_LINUX_KERNEL_DEFCONFIG="44x/bamboo"
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/qemu/ppc-bamboo/linux.fragment"
+BR2_LINUX_KERNEL_VMLINUX=y
+
+# Serial port config
+BR2_TARGET_GENERIC_GETTY=y
+BR2_TARGET_GENERIC_GETTY_PORT="ttyS0"
+
+# Kernel needs mkimage
+BR2_PACKAGE_HOST_UBOOT_TOOLS=y
+
+# host-qemu for gitlab testing
+BR2_PACKAGE_HOST_QEMU=y
+BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y
-- 
2.31.1

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[Buildroot] [PATCH 3/3] package/qemu: Add support for PPC970 processors

[Cédric Le Goater]

PPC970 processors are well supported by the QEMU pseries and macbook
machines. The latest debian 11 (big endian) runs with SMP. Re-add
support.

Fixes: efc67deef38c ("qemu: remove support for some PowerPC processors in host qemu")
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 package/qemu/Config.in.host | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/qemu/Config.in.host b/package/qemu/Config.in.host
index df5d92112582..f9cdb9b70371 100644
--- a/package/qemu/Config.in.host
+++ b/package/qemu/Config.in.host
@@ -22,7 +22,7 @@ config BR2_PACKAGE_HOST_QEMU_ARCH_SUPPORTS
 	default y if BR2_xtensa
 	default y if BR2_x86_64
 	depends on !BR2_x86_steamroller && !BR2_x86_core_avx2
-	depends on !BR2_powerpc_620 && !BR2_powerpc_630 && !BR2_powerpc_970
+	depends on !BR2_powerpc_620 && !BR2_powerpc_630
 
 config BR2_PACKAGE_HOST_QEMU_SYSTEM_ARCH_SUPPORTS
 	bool
-- 
2.31.1

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Re: [Buildroot] [PATCH 1/3] configs/qemu: Add a ppc64le-powernv8 configuration

[Cédric Le Goater]

Hello Thomas,

> Thanks, entire patch series applied. One small change was done: add
> appropriate entries to the DEVELOPERS file, so that we know who to
> contact for those defconfigs :-) Especially if our Gitlab CI
> infrastructure detects build issues, you will be notified.

sure. I have a generated set here :

   https://github.com/legoater/qemu-ppc-boot/tree/main/buildroot

that I use for non regression on QEMU PPC.

> Since you are a PowerPC expert, I'd like to take this opportunity to
> ask you about the toolchains we're providing at
> https://toolchains.bootlin.com/. For the moment for PowerPC, we are
> providing the following toolchains:
> 
> powerpc-440fp, not tested

The bamboo machine uses a 440EP CPU implementation, which has a
floating point unit.
     
> powerpc64-e5500, tested with qemu_ppc64_e5500_defconfig
> powerpc64-e6500, not tested

e6500 is nearly the same CPU as e5500. AFAIK, the main differences
are altivec instructions and more HV support for guest translations.

More info here :

   https://www.linux-kvm.org/page/E500_virtual_CPU_specification

> powerpc64le-power8, tested with qemu_ppc64le_pseries_defconfig
> powerpc64-power8, tested with qemu_ppc64_pseries_defconfig
> powerpc-e300c3, not tested
> powerpc-e500mc, not tested

you could use the 32bit ppce500 machine for that.

> I suppose I could now test the powerpc-440fp toolchain with the
> qemu_ppc_bamboo_defconfig you have added. Is that correct?

yes.
  
> What about the other toolchain configurations? Is there some matching
> Qemu emulation?>
> And generally speaking, does this selection of PowerPC architecture
> variants make sense to offer pre-compiled toolchains? For quite a

Here is a quick status of machine/CPUs that QEMU implements :

* prep

   prep: 604 CPU (we might remove 601-603 CPUs)

* embedded

   ref405ep: 405EP (user space segfaults but same image works on 44x CPUs
                    I hope to get that one fixed by QEMU 7.0 )
   bambo:    440FP
   sam460ex: 460EP is very much like the 440fp

* Mac

   g3beige:  G3 (or 75x CPU) family
   mac99:    G4 (7400 7410 7441 7447 7448 7450 7451 7455 7457) family

* book3e 32bit:

   ppce500:   e500mc
   mpc8544ds: mpc8544

* book3e 64bit:

   ppce500 (KVM): e5500, e6500
   
* book3s 64bit (para virtualized and baremetal):

   mac99: PPC970
   pseries (BE only): PPC970, PPC970mp, POWER5+
   pseries (LE, BE and KVM) : POWER7, POWER8, POWER9, POWER10
   powernv: POWER8, POWER9, POWER10

Most of the attention is on book3s 64bit CPUs. MAC emulation is well
maintained. Embedded world is not.

> while, we've had requests for other PowerPC variants:
> https://github.com/bootlin/toolchains-builder/issues/2. Your input
> would be very welcome :-)

OK. I will take a look.

Thanks,

C.
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Re: [Buildroot] [PATCH 1/3] configs/qemu: Add a ppc64le-powernv8 configuration

[Thomas Petazzoni]

Hello Cédric,

On Mon, 10 Jan 2022 22:02:33 +0100
Cédric Le Goater <clg@kaod.org> wrote:

> PowerNV is the platform using the OPAL [1] firmware on OpenPOWER
> systems. OPAL first loads a kernel and an initramfs image based on
> buildroot including a second boot loader petitboot [2]. The latter
> does device discovery and kexecs a new Linux image from disk or
> network.
> 
> QEMU implements PowerNV machines [3] for the POWER8, POWER9 and
> Power10 processors which are used for dev and tests. POWER8 images
> being compatible with POWER9 and Power10, simply add a single
> qemu_ppc64le_powernv8 board for all.
> 
> The QEMU script boots directly from a nvme disk because it is simple
> enough but a real system would boot from a ramfs first.
> 
> [1] https://github.com/open-power/skiboot/blob/master/doc/overview.rst
> [2] https://github.com/open-power/petitboot/
> [3] https://qemu.readthedocs.io/en/latest/system/ppc/powernv.html
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>  board/qemu/ppc64le-powernv8/readme.txt  |  5 +++++
>  configs/qemu_ppc64le_powernv8_defconfig | 29 +++++++++++++++++++++++++
>  2 files changed, 34 insertions(+)
>  create mode 100644 board/qemu/ppc64le-powernv8/readme.txt
>  create mode 100644 configs/qemu_ppc64le_powernv8_defconfig

Thanks, entire patch series applied. One small change was done: add
appropriate entries to the DEVELOPERS file, so that we know who to
contact for those defconfigs :-) Especially if our Gitlab CI
infrastructure detects build issues, you will be notified.

Since you are a PowerPC expert, I'd like to take this opportunity to
ask you about the toolchains we're providing at
https://toolchains.bootlin.com/. For the moment for PowerPC, we are
providing the following toolchains:

powerpc-440fp, not tested
powerpc64-e5500, tested with qemu_ppc64_e5500_defconfig
powerpc64-e6500, not tested
powerpc64le-power8, tested with qemu_ppc64le_pseries_defconfig
powerpc64-power8, tested with qemu_ppc64_pseries_defconfig
powerpc-e300c3, not tested
powerpc-e500mc, not tested

I suppose I could now test the powerpc-440fp toolchain with the
qemu_ppc_bamboo_defconfig you have added. Is that correct?

What about the other toolchain configurations? Is there some matching
Qemu emulation?

And generally speaking, does this selection of PowerPC architecture
variants make sense to offer pre-compiled toolchains? For quite a
while, we've had requests for other PowerPC variants:
https://github.com/bootlin/toolchains-builder/issues/2. Your input
would be very welcome :-)

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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Re: [Buildroot] [PATCH 1/3] configs/qemu: Add a ppc64le-powernv8 configuration

[Cédric Le Goater]

oops. I sent the patchset twice. Sorry for the noise.

C.

On 1/10/22 22:02, Cédric Le Goater wrote:
> PowerNV is the platform using the OPAL [1] firmware on OpenPOWER
> systems. OPAL first loads a kernel and an initramfs image based on
> buildroot including a second boot loader petitboot [2]. The latter
> does device discovery and kexecs a new Linux image from disk or
> network.
> 
> QEMU implements PowerNV machines [3] for the POWER8, POWER9 and
> Power10 processors which are used for dev and tests. POWER8 images
> being compatible with POWER9 and Power10, simply add a single
> qemu_ppc64le_powernv8 board for all.
> 
> The QEMU script boots directly from a nvme disk because it is simple
> enough but a real system would boot from a ramfs first.
> 
> [1] https://github.com/open-power/skiboot/blob/master/doc/overview.rst
> [2] https://github.com/open-power/petitboot/
> [3] https://qemu.readthedocs.io/en/latest/system/ppc/powernv.html
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>   board/qemu/ppc64le-powernv8/readme.txt  |  5 +++++
>   configs/qemu_ppc64le_powernv8_defconfig | 29 +++++++++++++++++++++++++
>   2 files changed, 34 insertions(+)
>   create mode 100644 board/qemu/ppc64le-powernv8/readme.txt
>   create mode 100644 configs/qemu_ppc64le_powernv8_defconfig
> 
> diff --git a/board/qemu/ppc64le-powernv8/readme.txt b/board/qemu/ppc64le-powernv8/readme.txt
> new file mode 100644
> index 000000000000..059f55fbc917
> --- /dev/null
> +++ b/board/qemu/ppc64le-powernv8/readme.txt
> @@ -0,0 +1,5 @@
> +Run the emulation with:
> +
> +qemu-system-ppc64 -M powernv9 -kernel vmlinux -append "console=hvc0 rootwait root=/dev/nvme0n1" -device nvme,bus=pcie.3,addr=0x0,drive=drive0,serial=1234 -drive file=./rootfs.ext2,if=none,id=drive0,format=raw,cache=none -device e1000e,netdev=net0,mac=C0:FF:EE:00:01:03,bus=pcie.1,addr=0x0  -netdev user,id=net0 -serial mon:stdio -nographic # qemu_ppc64le_powernv8_defconfig
> +
> +The login prompt will appear in the terminal window.
> diff --git a/configs/qemu_ppc64le_powernv8_defconfig b/configs/qemu_ppc64le_powernv8_defconfig
> new file mode 100644
> index 000000000000..d8ea6655fce0
> --- /dev/null
> +++ b/configs/qemu_ppc64le_powernv8_defconfig
> @@ -0,0 +1,29 @@
> +# Architecture
> +BR2_powerpc64le=y
> +BR2_powerpc_power8=y
> +
> +# System
> +BR2_TARGET_GENERIC_GETTY_PORT="hvc0"
> +BR2_SYSTEM_DHCP="eth0"
> +
> +# Filesystem
> +BR2_TARGET_ROOTFS_EXT2=y
> +# BR2_TARGET_ROOTFS_TAR is not set
> +
> +# Image
> +BR2_ROOTFS_POST_IMAGE_SCRIPT="board/qemu/post-image.sh"
> +BR2_ROOTFS_POST_SCRIPT_ARGS="$(BR2_DEFCONFIG)"
> +
> +# Linux headers same as kernel
> +BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
> +
> +# Kernel
> +BR2_LINUX_KERNEL=y
> +BR2_LINUX_KERNEL_CUSTOM_VERSION=y
> +BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15"
> +BR2_LINUX_KERNEL_DEFCONFIG="powernv"
> +BR2_LINUX_KERNEL_VMLINUX=y
> +
> +# host-qemu for gitlab testing
> +BR2_PACKAGE_HOST_QEMU=y
> +BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y
> 

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[Buildroot] [PATCH 1/3] configs/qemu: Add a ppc64le-powernv8 configuration

[Cédric Le Goater]

PowerNV is the platform using the OPAL [1] firmware on OpenPOWER
systems. OPAL first loads a kernel and an initramfs image based on
buildroot including a second boot loader petitboot [2]. The latter
does device discovery and kexecs a new Linux image from disk or
network.

QEMU implements PowerNV machines [3] for the POWER8, POWER9 and
Power10 processors which are used for dev and tests. POWER8 images
being compatible with POWER9 and Power10, simply add a single
qemu_ppc64le_powernv8 board for all.

The QEMU script boots directly from a nvme disk because it is simple
enough but a real system would boot from a ramfs first.

[1] https://github.com/open-power/skiboot/blob/master/doc/overview.rst
[2] https://github.com/open-power/petitboot/
[3] https://qemu.readthedocs.io/en/latest/system/ppc/powernv.html

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 board/qemu/ppc64le-powernv8/readme.txt  |  5 +++++
 configs/qemu_ppc64le_powernv8_defconfig | 29 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 board/qemu/ppc64le-powernv8/readme.txt
 create mode 100644 configs/qemu_ppc64le_powernv8_defconfig

diff --git a/board/qemu/ppc64le-powernv8/readme.txt b/board/qemu/ppc64le-powernv8/readme.txt
new file mode 100644
index 000000000000..059f55fbc917
--- /dev/null
+++ b/board/qemu/ppc64le-powernv8/readme.txt
@@ -0,0 +1,5 @@
+Run the emulation with:
+
+qemu-system-ppc64 -M powernv9 -kernel vmlinux -append "console=hvc0 rootwait root=/dev/nvme0n1" -device nvme,bus=pcie.3,addr=0x0,drive=drive0,serial=1234 -drive file=./rootfs.ext2,if=none,id=drive0,format=raw,cache=none -device e1000e,netdev=net0,mac=C0:FF:EE:00:01:03,bus=pcie.1,addr=0x0  -netdev user,id=net0 -serial mon:stdio -nographic # qemu_ppc64le_powernv8_defconfig
+
+The login prompt will appear in the terminal window.
diff --git a/configs/qemu_ppc64le_powernv8_defconfig b/configs/qemu_ppc64le_powernv8_defconfig
new file mode 100644
index 000000000000..d8ea6655fce0
--- /dev/null
+++ b/configs/qemu_ppc64le_powernv8_defconfig
@@ -0,0 +1,29 @@
+# Architecture
+BR2_powerpc64le=y
+BR2_powerpc_power8=y
+
+# System
+BR2_TARGET_GENERIC_GETTY_PORT="hvc0"
+BR2_SYSTEM_DHCP="eth0"
+
+# Filesystem
+BR2_TARGET_ROOTFS_EXT2=y
+# BR2_TARGET_ROOTFS_TAR is not set
+
+# Image
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/qemu/post-image.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="$(BR2_DEFCONFIG)"
+
+# Linux headers same as kernel
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15"
+BR2_LINUX_KERNEL_DEFCONFIG="powernv"
+BR2_LINUX_KERNEL_VMLINUX=y
+
+# host-qemu for gitlab testing
+BR2_PACKAGE_HOST_QEMU=y
+BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y
-- 
2.31.1

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