linux-kernel - Re: [PATCH v14 13/25] samples: Add sample userspace Gunyah VM Manager

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Message-ID: <3krirzh2fojye44a7trzit54opfssnzzsujbo4kzv2mqzhpsmo@qrm53c5naaqw>
Date:   Sat, 5 Aug 2023 11:03:33 -0700
From:   Bjorn Andersson <andersson@...nel.org>
To:     Elliot Berman <quic_eberman@...cinc.com>
Cc:     Alex Elder <elder@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Murali Nalajala <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Will Deacon <will@...nel.org>, Andy Gross <agross@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v14 13/25] samples: Add sample userspace Gunyah VM Manager

On Tue, Jun 13, 2023 at 10:20:41AM -0700, Elliot Berman wrote:
> diff --git a/samples/gunyah/gunyah_vmm.c b/samples/gunyah/gunyah_vmm.c
> new file mode 100644
> index 0000000000000..6f636ac227c69
> --- /dev/null
> +++ b/samples/gunyah/gunyah_vmm.c
> @@ -0,0 +1,266 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include <stdlib.h>
> +#include <stdio.h>
> +#include <unistd.h>
> +#include <sys/types.h>
> +#include <sys/stat.h>
> +#include <fcntl.h>
> +#include <sys/ioctl.h>
> +#include <getopt.h>
> +#include <limits.h>
> +#include <stdint.h>
> +#include <fcntl.h>
> +#include <string.h>
> +#include <sys/sysmacros.h>
> +#define __USE_GNU
> +#include <sys/mman.h>
> +
> +#include <linux/gunyah.h>
> +
> +#define DEFAULT_GUEST_BASE	0x80000000
> +#define DEFAULT_GUEST_SIZE	0x6400000 /* 100 MiB */
> +#define DEFAULT_DTB_OFFSET	0x45f0000 /* 70MiB - 64 KiB */
> +#define DEFAULT_RAMDISK_OFFSET	0x4600000 /* 70MiB */

Would be nice if the default ramdisk offset was close to accounting for
the kernel modules produced in an upstream defconfig build... Perhaps
just bumping the default guest size to facilitate this?

[..]
> diff --git a/samples/gunyah/sample_vm.dts b/samples/gunyah/sample_vm.dts
> new file mode 100644
> index 0000000000000..293bbc0469c8f
> --- /dev/null
> +++ b/samples/gunyah/sample_vm.dts
> @@ -0,0 +1,68 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +/dts-v1/;
> +
> +/ {
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +	interrupt-parent = <&intc>;
> +
> +	chosen {
> +		bootargs = "nokaslr";

Is this required?

> +	};
> +
> +	cpus {
> +		#address-cells = <0x2>;
> +		#size-cells = <0>;
> +
> +		cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,armv8";
> +			reg = <0 0>;
> +		};
> +	};
> +
> +	intc: interrupt-controller@...F0000 {
> +		compatible = "arm,gic-v3";
> +		#interrupt-cells = <3>;
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		interrupt-controller;
> +		reg = <0 0x3FFF0000 0 0x10000>,
> +		      <0 0x3FFD0000 0 0x20000>;

Lowercase hex digits please.

> +	};
> +
> +	timer {
> +		compatible = "arm,armv8-timer";
> +		always-on;
> +		interrupts = <1 13 0x108>,
> +			     <1 14 0x108>,
> +			     <1 11 0x108>,
> +			     <1 10 0x108>;
> +		clock-frequency = <19200000>;
> +	};
> +
> +	gunyah-vm-config {

Is this node documented somewhere?

Regards,
Bjorn

> +		image-name = "linux_vm_0";
> +
> +		memory {
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +
> +			base-address = <0 0x80000000>;
> +		};
> +
> +		interrupts {
> +			config = <&intc>;
> +		};
> +
> +		vcpus {
> +			affinity-map = < 0 >;
> +			sched-priority = < (-1) >;
> +			sched-timeslice = < 2000 >;
> +		};
> +	};
> +};
> -- 
> 2.40.0
>