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[94.34.131.227]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5cbb629e17dsm446938a12.34.2024.10.25.02.50.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Oct 2024 02:50:53 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: a0af0c54-92b6-11ef-a0bf-8be0dac302b0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=minervasys-tech.20230601.gappssmtp.com; s=20230601; t=1729849854; x=1730454654; darn=lists.xenproject.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=q3YSYZZGzDA1A2+rRg1kiZQBh+Nb+gR1I0/CKDqg1TA=; b=U8gMB2jyEPEw74/Vt/K+ObRgYvZhzA1jxjG7bcf/QvwJ7p98fZPrHx23iyxZfrT1SO ImlV1NOE9X5xRErz5SgTcM299XCAUMTp08jENvl+koWN3Rx5/pgOoQ87opxO7JxekGZa GM0qFzosGAdljQWCXHloOgcBpoGMeAlPkmjas4cVXfydK02ncvNTaSSWQijwa+EPncwR LPvHoFKrKSipg3sjEnlwvRyAW3PU7agvQAA0xUxfuXjJtvOjVQus560LKHdnn0cEJYGP NeD7bZpNSZS2S3/vfayQgzYJ5M8ioLArxydsKECKsfMQvHSMHRPiScFr35/ozgAMfDlb aVYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729849854; x=1730454654; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=q3YSYZZGzDA1A2+rRg1kiZQBh+Nb+gR1I0/CKDqg1TA=; b=fSJYDOJCAV4pcZx7wEBDXnp1l4Cbih3NEGLIPe6qykRlRF7KtPHBd3oM29LehWAXN+ sPnl0NCTMKMBXwQBlZEGGbJVYraMazskKKpcIlugkSaJzfthP6pG5Gh3Vb2muOeCwdis xVYS4tCF1ApXgLYMerJGjpXH9TdnYJBcBp3vozTETCFnOcl8RcMxNbrf9rFhWWsu1XCf ESCnmGBKn9YVtZgZkCiinikgbofPbYAnRWz8kmvVf0MkYt5c5DW5C3xpeWYvYCHJCeKW 4q6EYSbj3uS8tYhMGkU1WPpAszP34MxjCOYUGLZL5NDmmPeZjfp9eLGN0lRagRyHbUrq ebyw== X-Gm-Message-State: AOJu0YwaJ7JNrJ3XKdLNcgh0OxU7IDcCdkz4/ZMF270aOSaKbqhqA8cF BIPgyWxEW4I+ttAuIr+puVJgF9tNTw0+duBBbcMGNCTxjUdeumejkj4FFUvPSBmi4zlc42AuSZV +Oro= X-Google-Smtp-Source: AGHT+IFAsBC48HB8S0chYmKLi82qaDD2YqIVbVwlPylhFyTCBL/R6Ga8rwtQEytxqdB5SptWR5aPbg== X-Received: by 2002:a05:6402:2106:b0:5c3:cd88:a0a with SMTP id 4fb4d7f45d1cf-5cb8b1ac807mr6980556a12.18.1729849854078; Fri, 25 Oct 2024 02:50:54 -0700 (PDT) From: Carlo Nonato To: xen-devel@lists.xenproject.org Cc: andrea.bastoni@minervasys.tech, Carlo Nonato , Stefano Stabellini , Julien Grall , Bertrand Marquis , Michal Orzel , Volodymyr Babchuk , Andrew Cooper , Jan Beulich , Marco Solieri Subject: [PATCH v9 07/13] xen/arm: add support for cache coloring configuration via device-tree Date: Fri, 25 Oct 2024 11:50:08 +0200 Message-ID: <20241025095014.42376-8-carlo.nonato@minervasys.tech> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241025095014.42376-1-carlo.nonato@minervasys.tech> References: <20241025095014.42376-1-carlo.nonato@minervasys.tech> MIME-Version: 1.0 Add the "llc-colors" Device Tree attribute to express DomUs and Dom0less color configurations. Based on original work from: Luca Miccio Signed-off-by: Carlo Nonato Signed-off-by: Marco Solieri --- v9: - use best-effort allocation in domain_set_llc_colors_from_str() v8: - fixed memory leak on error path of domain_set_llc_colors_from_str() - realloc colors array after parsing from string to reduce memory usage v7: - removed alloc_colors() helper usage from domain_set_llc_colors_from_str() v6: - rewrote domain_set_llc_colors_from_str() to be more explicit v5: - static-mem check has been moved in a previous patch - added domain_set_llc_colors_from_str() to set colors after domain creation --- docs/misc/arm/device-tree/booting.txt | 4 +++ docs/misc/cache-coloring.rst | 48 +++++++++++++++++++++++++++ xen/arch/arm/dom0less-build.c | 10 ++++++ xen/common/llc-coloring.c | 41 +++++++++++++++++++++++ xen/include/xen/llc-coloring.h | 1 + xen/include/xen/xmalloc.h | 12 +++++++ 6 files changed, 116 insertions(+) diff --git a/docs/misc/arm/device-tree/booting.txt b/docs/misc/arm/device-tree/booting.txt index 3a04f5c57f..9085645433 100644 --- a/docs/misc/arm/device-tree/booting.txt +++ b/docs/misc/arm/device-tree/booting.txt @@ -162,6 +162,10 @@ with the following properties: An integer specifying the number of vcpus to allocate to the guest. +- llc-colors + A string specifying the LLC color configuration for the guest. + Refer to docs/misc/cache_coloring.rst for syntax. + - vpl011 An empty property to enable/disable a virtual pl011 for the guest to diff --git a/docs/misc/cache-coloring.rst b/docs/misc/cache-coloring.rst index c5fb33996c..c14b6ee2f4 100644 --- a/docs/misc/cache-coloring.rst +++ b/docs/misc/cache-coloring.rst @@ -12,6 +12,7 @@ If needed, change the maximum number of colors with ``CONFIG_LLC_COLORS_ORDER=``. Runtime configuration is done via `Command line parameters`_. +For DomUs follow `DomUs configuration`_. Background ********** @@ -147,6 +148,53 @@ LLC specs can be manually set via the above command line parameters. This bypasses any auto-probing and it's used to overcome failing situations, such as flawed probing logic, or for debugging/testing purposes. +DomUs configuration +******************* + +DomUs colors can be set either in the ``xl`` configuration file (documentation +at `docs/man/xl.cfg.pod.5.in`) or via Device Tree, also for Dom0less +configurations (documentation at `docs/misc/arm/device-tree/booting.txt`) using +the ``llc-colors`` option. For example: + +:: + + xen,xen-bootargs = "console=dtuart dtuart=serial0 dom0_mem=1G dom0_max_vcpus=1 sched=null llc-coloring=on dom0-llc-colors=2-6"; + xen,dom0-bootargs "console=hvc0 earlycon=xen earlyprintk=xen root=/dev/ram0" + + dom0 { + compatible = "xen,linux-zimage" "xen,multiboot-module"; + reg = <0x0 0x1000000 0x0 15858176>; + }; + + dom0-ramdisk { + compatible = "xen,linux-initrd" "xen,multiboot-module"; + reg = <0x0 0x2000000 0x0 20638062>; + }; + + domU0 { + #address-cells = <0x1>; + #size-cells = <0x1>; + compatible = "xen,domain"; + memory = <0x0 0x40000>; + llc-colors = "4-8,10,11,12"; + cpus = <0x1>; + vpl011 = <0x1>; + + module@2000000 { + compatible = "multiboot,kernel", "multiboot,module"; + reg = <0x2000000 0xffffff>; + bootargs = "console=ttyAMA0"; + }; + + module@30000000 { + compatible = "multiboot,ramdisk", "multiboot,module"; + reg = <0x3000000 0xffffff>; + }; + }; + +**Note:** If no color configuration is provided for a domain, the default one, +which corresponds to all available colors is used instead. + Known issues and limitations **************************** diff --git a/xen/arch/arm/dom0less-build.c b/xen/arch/arm/dom0less-build.c index 67b1503647..49d1f14d65 100644 --- a/xen/arch/arm/dom0less-build.c +++ b/xen/arch/arm/dom0less-build.c @@ -817,6 +817,7 @@ void __init create_domUs(void) bool iommu = false; const struct dt_device_node *cpupool_node, *chosen = dt_find_node_by_path("/chosen"); + const char *llc_colors_str = NULL; BUG_ON(chosen == NULL); dt_for_each_child_node(chosen, node) @@ -965,6 +966,10 @@ void __init create_domUs(void) #endif } + dt_property_read_string(node, "llc-colors", &llc_colors_str); + if ( !llc_coloring_enabled && llc_colors_str ) + panic("'llc-colors' found, but LLC coloring is disabled\n"); + /* * The variable max_init_domid is initialized with zero, so here it's * very important to use the pre-increment operator to call @@ -975,6 +980,11 @@ void __init create_domUs(void) panic("Error creating domain %s (rc = %ld)\n", dt_node_name(node), PTR_ERR(d)); + if ( llc_coloring_enabled && + (rc = domain_set_llc_colors_from_str(d, llc_colors_str)) ) + panic("Error initializing LLC coloring for domain %s (rc = %d)\n", + dt_node_name(node), rc); + d->is_console = true; dt_device_set_used_by(node, d->domain_id); diff --git a/xen/common/llc-coloring.c b/xen/common/llc-coloring.c index 2ab0bb10a3..03d6c7054c 100644 --- a/xen/common/llc-coloring.c +++ b/xen/common/llc-coloring.c @@ -4,6 +4,7 @@ * * Copyright (C) 2022 Xilinx Inc. */ +#include "xen/xmalloc.h" #include #include #include @@ -266,6 +267,46 @@ void domain_llc_coloring_free(struct domain *d) xfree(__va(__pa(d->llc_colors))); } +int __init domain_set_llc_colors_from_str(struct domain *d, const char *str) +{ + int err; + unsigned int *colors, num_colors; + + if ( !str ) + { + domain_set_default_colors(d); + return 0; + } + + colors = xmalloc_array(unsigned int, max_nr_colors); + if ( !colors ) + return -ENOMEM; + + err = parse_color_config(str, colors, max_nr_colors, &num_colors); + if ( err ) + { + printk(XENLOG_ERR "Error parsing LLC color configuration"); + xfree(colors); + return err; + } + + if ( !check_colors(colors, num_colors) ) + { + printk(XENLOG_ERR "%pd: bad LLC color config\n", d); + xfree(colors); + return -EINVAL; + } + + /* Adjust the size cause it was initially set to max_nr_colors */ + d->llc_colors = xrealloc_array(colors, num_colors); + if ( !d->llc_colors ) + d->llc_colors = colors; + + d->num_llc_colors = num_colors; + + return 0; +} + /* * Local variables: * mode: C diff --git a/xen/include/xen/llc-coloring.h b/xen/include/xen/llc-coloring.h index b3801fca00..49ebd1e712 100644 --- a/xen/include/xen/llc-coloring.h +++ b/xen/include/xen/llc-coloring.h @@ -31,6 +31,7 @@ void arch_llc_coloring_init(void); int dom0_set_llc_colors(struct domain *d); int domain_set_llc_colors(struct domain *d, const struct xen_domctl_set_llc_colors *config); +int domain_set_llc_colors_from_str(struct domain *d, const char *str); #endif /* __COLORING_H__ */ diff --git a/xen/include/xen/xmalloc.h b/xen/include/xen/xmalloc.h index b903fa2e26..f0412fb4e0 100644 --- a/xen/include/xen/xmalloc.h +++ b/xen/include/xen/xmalloc.h @@ -37,6 +37,9 @@ ((_type *)_xmalloc_array(sizeof(_type), __alignof__(_type), _num)) #define xzalloc_array(_type, _num) \ ((_type *)_xzalloc_array(sizeof(_type), __alignof__(_type), _num)) +#define xrealloc_array(_ptr, _num) \ + ((typeof(_ptr))_xrealloc_array(_ptr, sizeof(typeof(*(_ptr))), \ + __alignof__(typeof(*(_ptr))), _num)) /* Allocate space for a structure with a flexible array of typed objects. */ #define xzalloc_flex_struct(type, field, nr) \ @@ -98,6 +101,15 @@ static inline void *_xzalloc_array( return _xzalloc(size * num, align); } +static inline void *_xrealloc_array( + void *ptr, unsigned long size, unsigned long align, unsigned long num) +{ + /* Check for overflow. */ + if ( size && num > UINT_MAX / size ) + return NULL; + return _xrealloc(ptr, size * num, align); +} + /* * Pooled allocator interface. */