From nobody Sat Dec 28 05:40:32 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; a=rsa-sha256; t=1733158795; cv=none; d=zohomail.com; s=zohoarc; b=Q08jnYHykuhOanh0OLI/55uLsn9p7k5vdWR0I5dC8TRjKg+KoHXURqWx9a1dgvp9HQme6GrKyXezdsTrLxRSEPa/UiW3oMe4kqvxbQlC+ZYjVKUQIhIrYQEmf2YPIMQVKYfd0zGB0hbt9OoLF5C2LF+a1Ye8fug0Lt16Exfx40E= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1733158795; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=JHLIjqNln10+uaaGPR6Goi/c1sEntGahZG9YudcBl6s=; b=Ge8T8E4apo8pWA6pQAI3OIXwcBeEfVgm1XQKCa/AYBEz+epUhlGnH+PvesH2cDcGDSutZn1WLoYayUSvu2Zbsiq5FXf+rZSwgKJ2iAmBF/f5D37au8Rt+bEd6xTz6qjz4Y8ld1RZdgu/pvStZuUMY4ctRw6lrDlJQUy2X/eKflg= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1733158795121645.7226726122736; Mon, 2 Dec 2024 08:59:55 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.846765.1261936 (Exim 4.92) (envelope-from ) id 1tI9ll-0007hU-0U; Mon, 02 Dec 2024 16:59:33 +0000 Received: by outflank-mailman (output) from mailman id 846765.1261936; Mon, 02 Dec 2024 16:59:32 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1tI9lk-0007gd-Qw; Mon, 02 Dec 2024 16:59:32 +0000 Received: by outflank-mailman (input) for mailman id 846765; Mon, 02 Dec 2024 16:59:30 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1tI9li-0006x4-G8 for xen-devel@lists.xenproject.org; Mon, 02 Dec 2024 16:59:30 +0000 Received: from mail-ej1-x632.google.com (mail-ej1-x632.google.com [2a00:1450:4864:20::632]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id c9afe829-b0ce-11ef-99a3-01e77a169b0f; Mon, 02 Dec 2024 17:59:26 +0100 (CET) Received: by mail-ej1-x632.google.com with SMTP id a640c23a62f3a-aa54adcb894so592012866b.0 for ; Mon, 02 Dec 2024 08:59:26 -0800 (PST) Received: from carlo-ubuntu.home.arpa (host-95-230-250-178.business.telecomitalia.it. [95.230.250.178]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aa5998e64c4sm526802666b.97.2024.12.02.08.59.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Dec 2024 08:59:25 -0800 (PST) X-Outflank-Mailman: Message body and most headers restored to incoming version 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: c9afe829-b0ce-11ef-99a3-01e77a169b0f DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=minervasys-tech.20230601.gappssmtp.com; s=20230601; t=1733158766; x=1733763566; 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=JHLIjqNln10+uaaGPR6Goi/c1sEntGahZG9YudcBl6s=; b=nwLK0uIrER4O2w3WP0oY9aA1j9aVxBeHF7wX+U50mW8GKkSwnhLUF9/CcZFJKUAkhW +decTTSo8zeUZPu67AmhaW2FSQSkXlHNR/lOIIy/5Y1vkT+QaQyUMqFUBBEDIC3aTgis GJ1qaGEgZKf937QNRWwMLjYfrlh1G9dddrhCm2Ixnpd+qh7euZ0NH3Two/zSEVlbgZHI VtNEnPlou2EFxn7Rc8wJAVkaRgG/XU5otHIS8142m76DyQB38xApwSx5jrSwc96CtxxQ fvU2nAObEGh44EQl2WCwWUPUmOdNkPo5Renizot3XofDJuc74QMhlrif73NsKC3bfnQv iKpg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733158766; x=1733763566; 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=JHLIjqNln10+uaaGPR6Goi/c1sEntGahZG9YudcBl6s=; b=kS5a/BU/yWmp/i8rCstOtbWFETOgFYWmUSNU59pNj44WiQXnv4R6fUb+fDUIHkkEPn dfvGVC0xHWwPGWjbAREAPMKJRys9qvGsx3OfFFFK8OGqKk+y1NEcsPusAr46QbkUAURM NgrZwtJZNOnVN/iEoMZfWcjCom4BSdhUh4SjqkvaQ7KLXoOsPGZXpMSBjpNtZanA41F/ LkPjBzK9ilpZLfAzIGl2HuWnBxs76vzBeEpSkD4sVEBG8d4WOwEz4JQ7jq1LYjov6kSL K37MKG9a5ea1w33wRTuQDs0Ae0MvVuYmtIEL2t2LFCNDY4KLy5c1f7GQwn2tJ0/Gux9U TIhA== X-Gm-Message-State: AOJu0Yx8iNKXatiNmH+jQTbKcGGV/eJ88v6ej0ncoVPsHd3THRQMx6d3 Cbv75aEuxDR33EXlHV+b+3DGDtqT0tr5hhNpfPs3BoRjDEaiG22421yxla6njJwhpEB5qxRELC3 U X-Gm-Gg: ASbGnctMdZLmtq/z0qiOvNNamVCCO32Ncp2ilj7uvcuJrFDx8wsXj8LJ1Q5JaYZ/2WG /UzhZnF+vBdQn21Okba2Y5RdneP1/lwwPCroI+DkHXiQSJe2HzUksUCJG0ayD15eD7dW25D+ASR KMGzLL62XasLSFvGvY/9SAxrduJoWHIoNXRoz1qi4MprtaYvnuKm1iNX5cRQJfY5QJdTRq3uPdQ 26fmBy01B6IJI5MPR4mX5ZuwuUKDiy+/KPoDj6U/jCcEJi7s9t2DsFMP3/Bzln+Km6FjnOt1rYp CiFeGvcbGbLpeo8CkRqWmQcjfeEpWAWQcRGM0poQZgBSAvB1/hs8 X-Google-Smtp-Source: AGHT+IHq+mPW+7hN/xHplIh/FSA2AJTOopTHeCCqUeuziyhDmQ/ahN1vH+jFcmEE6BKUhmxRRpwA1A== X-Received: by 2002:a17:906:3299:b0:aa5:2237:67af with SMTP id a640c23a62f3a-aa580edf62dmr1878429566b.9.1733158765672; Mon, 02 Dec 2024 08:59:25 -0800 (PST) From: Carlo Nonato To: xen-devel@lists.xenproject.org Cc: andrea.bastoni@minervasys.tech, marco.solieri@minervasys.tech, Carlo Nonato , Andrew Cooper , Jan Beulich , Julien Grall , Stefano Stabellini , Michal Orzel Subject: [PATCH v11 01/12] xen/common: add cache coloring common code Date: Mon, 2 Dec 2024 17:59:10 +0100 Message-ID: <20241202165921.249585-2-carlo.nonato@minervasys.tech> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241202165921.249585-1-carlo.nonato@minervasys.tech> References: <20241202165921.249585-1-carlo.nonato@minervasys.tech> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @minervasys-tech.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1733158797877116600 Content-Type: text/plain; charset="utf-8" Last Level Cache (LLC) coloring allows to partition the cache in smaller chunks called cache colors. Since not all architectures can actually implement it, add a HAS_LLC_COLORI= NG Kconfig option. LLC_COLORS_ORDER Kconfig option has a range maximum of 10 (2^10 =3D 1024) because that's the number of colors that fit in a 4 KiB page when integers are 4 bytes long. LLC colors are a property of the domain, so struct domain has to be extende= d. Based on original work from: Luca Miccio Signed-off-by: Carlo Nonato Signed-off-by: Marco Solieri Acked-by: Michal Orzel --- v11: - __COLORING_H__ -> __XEN_LLC_COLORING_H__ in llc-coloring.h - added SPDX tag to cache-coloring.rst - llc-coloring=3Doff now takes precedence over other cmdline options - removed useless #includes v10: - fixed commit message to use LLC_COLORS_ORDER - added documentation to index.rst - moved check on CONFIG_NUMA in arch/arm/Kconfig (next patch) - fixed copyright line - fixed array type for colors parameter in print_colors() - added check on (way_size & ~PAGE_MASK) v9: - dropped _MAX_ from CONFIG_MAX_LLC_COLORS_ORDER v8: - minor documentation fixes - "llc-coloring=3Don" is inferred from "llc-nr-ways" and "llc-size" usage - turned CONFIG_NR_LLC_COLORS to CONFIG_MAX_LLC_COLORS_ORDER, base-2 expone= nt - moved Kconfig options to common/Kconfig - don't crash if computed max_nr_colors is too large v7: - SUPPORT.md changes added to this patch - extended documentation to better address applicability of cache coloring - "llc-nr-ways" and "llc-size" params introduced in favor of "llc-way-size" - moved dump_llc_coloring_info() call in 'm' keyhandler (pagealloc_info()) v6: - moved almost all code in common - moved documentation in this patch - reintroduced range for CONFIG_NR_LLC_COLORS - reintroduced some stub functions to reduce the number of checks on llc_coloring_enabled - moved domain_llc_coloring_free() in same patch where allocation happens - turned "d->llc_colors" to pointer-to-const - llc_coloring_init() now returns void and panics if errors are found v5: - used - instead of _ for filenames - removed domain_create_llc_colored() - removed stub functions - coloring domain fields are now #ifdef protected v4: - Kconfig options moved to xen/arch - removed range for CONFIG_NR_LLC_COLORS - added "llc_coloring_enabled" global to later implement the boot-time switch - added domain_create_llc_colored() to be able to pass colors - added is_domain_llc_colored() macro --- SUPPORT.md | 7 ++ docs/index.rst | 1 + docs/misc/cache-coloring.rst | 118 +++++++++++++++++++++++++++++ docs/misc/xen-command-line.pandoc | 37 +++++++++ xen/common/Kconfig | 21 ++++++ xen/common/Makefile | 1 + xen/common/keyhandler.c | 3 + xen/common/llc-coloring.c | 121 ++++++++++++++++++++++++++++++ xen/common/page_alloc.c | 3 + xen/include/xen/llc-coloring.h | 36 +++++++++ xen/include/xen/sched.h | 5 ++ 11 files changed, 353 insertions(+) create mode 100644 docs/misc/cache-coloring.rst create mode 100644 xen/common/llc-coloring.c create mode 100644 xen/include/xen/llc-coloring.h diff --git a/SUPPORT.md b/SUPPORT.md index 82239d0294..998faf5635 100644 --- a/SUPPORT.md +++ b/SUPPORT.md @@ -401,6 +401,13 @@ by maintaining multiple physical to machine (p2m) memo= ry mappings. Status, x86 HVM: Tech Preview Status, ARM: Tech Preview =20 +### Cache coloring + +Allows to reserve Last Level Cache (LLC) partitions for Dom0, DomUs and Xen +itself. + + Status, Arm64: Experimental + ## Resource Management =20 ### CPU Pools diff --git a/docs/index.rst b/docs/index.rst index 1d44796d72..1bb8d02ea3 100644 --- a/docs/index.rst +++ b/docs/index.rst @@ -66,6 +66,7 @@ Documents in need of some rearranging. misc/xen-makefiles/makefiles misra/index fusa/index + misc/cache-coloring =20 =20 Miscellanea diff --git a/docs/misc/cache-coloring.rst b/docs/misc/cache-coloring.rst new file mode 100644 index 0000000000..371f21a0e7 --- /dev/null +++ b/docs/misc/cache-coloring.rst @@ -0,0 +1,118 @@ +.. SPDX-License-Identifier: CC-BY-4.0 + +Xen cache coloring user guide +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D + +The cache coloring support in Xen allows to reserve Last Level Cache (LLC) +partitions for Dom0, DomUs and Xen itself. Currently only ARM64 is support= ed. +Cache coloring realizes per-set cache partitioning in software and is appl= icable +to shared LLCs as implemented in Cortex-A53, Cortex-A72 and similar CPUs. + +To compile LLC coloring support set ``CONFIG_LLC_COLORING=3Dy``. + +If needed, change the maximum number of colors with +``CONFIG_LLC_COLORS_ORDER=3D``. + +Runtime configuration is done via `Command line parameters`_. + +Background +********** + +Cache hierarchy of a modern multi-core CPU typically has first levels dedi= cated +to each core (hence using multiple cache units), while the last level is s= hared +among all of them. Such configuration implies that memory operations on one +core (e.g. running a DomU) are able to generate interference on another co= re +(e.g. hosting another DomU). Cache coloring realizes per-set cache-partiti= oning +in software and mitigates this, guaranteeing more predictable performances= for +memory accesses. +Software-based cache coloring is particularly useful in those situations w= here +no hardware mechanisms (e.g., DSU-based way partitioning) are available to +partition caches. This is the case for e.g., Cortex-A53, A57 and A72 CPUs = that +feature a L2 LLC cache shared among all cores. + +The key concept underlying cache coloring is a fragmentation of the memory +space into a set of sub-spaces called colors that are mapped to disjoint c= ache +partitions. Technically, the whole memory space is first divided into a nu= mber +of subsequent regions. Then each region is in turn divided into a number of +subsequent sub-colors. The generic i-th color is then obtained by all the +i-th sub-colors in each region. + +:: + + Region j Region j+1 + ..................... ............ + . . . + . . + _ _ _______________ _ _____________________ _ _ + | | | | | | | + | c_0 | c_1 | | c_n | c_0 | c_1 | + _ _ _|_____|_____|_ _ _|_____|_____|_____|_ _ _ + : : + : :... ... . + : color 0 + :........................... ... . + : + . . ..................................: + +How colors are actually defined depends on the function that maps memory to +cache lines. In case of physically-indexed, physically-tagged caches with = linear +mapping, the set index is found by extracting some contiguous bits from the +physical address. This allows colors to be defined as shown in figure: they +appear in memory as subsequent blocks of equal size and repeats themselves= after +``n`` different colors, where ``n`` is the total number of colors. + +If some kind of bit shuffling appears in the mapping function, then colors +assume a different layout in memory. Those kind of caches aren't supported= by +the current implementation. + +**Note**: Finding the exact cache mapping function can be a really difficu= lt +task since it's not always documented in the CPU manual. As said Cortex-A5= 3, A57 +and A72 are known to work with the current implementation. + +How to compute the number of colors +################################### + +Given the linear mapping from physical memory to cache lines for granted, = the +number of available colors for a specific platform is computed using three +parameters: + +- the size of the LLC. +- the number of the LLC ways. +- the page size used by Xen. + +The first two parameters can be found in the processor manual, while the t= hird +one is the minimum mapping granularity. Dividing the cache size by the num= ber of +its ways we obtain the size of a way. Dividing this number by the page siz= e, +the number of total cache colors is found. So for example an Arm Cortex-A53 +with a 16-ways associative 1 MiB LLC can isolate up to 16 colors when page= s are +4 KiB in size. + +Effective colors assignment +########################### + +When assigning colors, if one wants to avoid cache interference between two +domains, different colors needs to be used for their memory. + +Command line parameters +*********************** + +Specific documentation is available at `docs/misc/xen-command-line.pandoc`. + ++----------------------+-------------------------------+ +| **Parameter** | **Description** | ++----------------------+-------------------------------+ +| ``llc-coloring`` | Enable coloring at runtime | ++----------------------+-------------------------------+ +| ``llc-size`` | Set the LLC size | ++----------------------+-------------------------------+ +| ``llc-nr-ways`` | Set the LLC number of ways | ++----------------------+-------------------------------+ + +Auto-probing of LLC specs +######################### + +LLC size and number of ways are probed automatically by default. + +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, su= ch as +flawed probing logic, or for debugging/testing purposes. diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line= .pandoc index 293dbc1a95..abd8dae96f 100644 --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -1708,6 +1708,43 @@ This option is intended for debugging purposes only.= Enable MSR_DEBUGCTL.LBR in hypervisor context to be able to dump the Last Interrupt/Exception To/F= rom record with other registers. =20 +### llc-coloring (arm64) +> `=3D ` + +> Default: `false` + +Flag to enable or disable LLC coloring support at runtime. This option is +available only when `CONFIG_LLC_COLORING` is enabled. See the general +cache coloring documentation for more info. + +### llc-nr-ways (arm64) +> `=3D ` + +> Default: `Obtained from hardware` + +Specify the number of ways of the Last Level Cache. This option is availab= le +only when `CONFIG_LLC_COLORING` is enabled. LLC size and number of ways ar= e used +to find the number of supported cache colors. By default the value is +automatically computed by probing the hardware, but in case of specific ne= eds, +it can be manually set. Those include failing probing and debugging/testing +purposes so that it's possible to emulate platforms with different number = of +supported colors. If set, also "llc-size" must be set, otherwise the defau= lt +will be used. Note that using both options implies "llc-coloring=3Don". + +### llc-size (arm64) +> `=3D ` + +> Default: `Obtained from hardware` + +Specify the size of the Last Level Cache. This option is available only wh= en +`CONFIG_LLC_COLORING` is enabled. LLC size and number of ways are used to = find +the number of supported cache colors. By default the value is automatically +computed by probing the hardware, but in case of specific needs, it can be +manually set. Those include failing probing and debugging/testing purposes= so +that it's possible to emulate platforms with different number of supported +colors. If set, also "llc-nr-ways" must be set, otherwise the default will= be +used. Note that using both options implies "llc-coloring=3Don". + ### lock-depth-size > `=3D ` =20 diff --git a/xen/common/Kconfig b/xen/common/Kconfig index 90268d9249..b4ec6893be 100644 --- a/xen/common/Kconfig +++ b/xen/common/Kconfig @@ -71,6 +71,9 @@ config HAS_IOPORTS config HAS_KEXEC bool =20 +config HAS_LLC_COLORING + bool + config HAS_PIRQ bool =20 @@ -516,4 +519,22 @@ config TRACEBUFFER to be collected at run time for debugging or performance analysis. Memory and execution overhead when not active is minimal. =20 +config LLC_COLORING + bool "Last Level Cache (LLC) coloring" if EXPERT + depends on HAS_LLC_COLORING + +config LLC_COLORS_ORDER + int "Maximum number of LLC colors (base-2 exponent)" + range 1 10 + default 7 + depends on LLC_COLORING + help + Controls the build-time size of various arrays associated with LLC + coloring. The value is a base-2 exponent. Refer to cache coloring + documentation for how to compute the number of colors supported by the + platform. This is only an upper bound. The runtime value is autocomputed + or manually set via cmdline parameters. + The default value corresponds to an 8 MiB 16-ways LLC, which should be + more than what's needed in the general case. + endmenu diff --git a/xen/common/Makefile b/xen/common/Makefile index b279b09bfb..cba3b32733 100644 --- a/xen/common/Makefile +++ b/xen/common/Makefile @@ -25,6 +25,7 @@ obj-y +=3D keyhandler.o obj-$(CONFIG_KEXEC) +=3D kexec.o obj-$(CONFIG_KEXEC) +=3D kimage.o obj-$(CONFIG_LIVEPATCH) +=3D livepatch.o livepatch_elf.o +obj-$(CONFIG_LLC_COLORING) +=3D llc-coloring.o obj-$(CONFIG_MEM_ACCESS) +=3D mem_access.o obj-y +=3D memory.o obj-y +=3D multicall.o diff --git a/xen/common/keyhandler.c b/xen/common/keyhandler.c index 6da291b34e..6ea54838d4 100644 --- a/xen/common/keyhandler.c +++ b/xen/common/keyhandler.c @@ -5,6 +5,7 @@ #include #include #include +#include #include #include #include @@ -304,6 +305,8 @@ static void cf_check dump_domains(unsigned char key) =20 arch_dump_domain_info(d); =20 + domain_dump_llc_colors(d); + rangeset_domain_printk(d); =20 dump_pageframe_info(d); diff --git a/xen/common/llc-coloring.c b/xen/common/llc-coloring.c new file mode 100644 index 0000000000..54d76e3aca --- /dev/null +++ b/xen/common/llc-coloring.c @@ -0,0 +1,121 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Last Level Cache (LLC) coloring common code + * + * Copyright (C) 2024, Advanced Micro Devices, Inc. + * Copyright (C) 2024, Minerva Systems SRL + */ +#include +#include +#include + +#define NR_LLC_COLORS (1U << CONFIG_LLC_COLORS_ORDER) + +/* + * -1: not specified (disabled unless llc-size and llc-nr-ways present) + * 0: explicitly disabled through cmdline + * 1: explicitly enabled through cmdline + */ +static int8_t __ro_after_init llc_coloring_enabled =3D -1; +boolean_param("llc-coloring", llc_coloring_enabled); + +static unsigned int __initdata llc_size; +size_param("llc-size", llc_size); +static unsigned int __initdata llc_nr_ways; +integer_param("llc-nr-ways", llc_nr_ways); +/* Number of colors available in the LLC */ +static unsigned int __ro_after_init max_nr_colors; + +static void print_colors(const unsigned int colors[], unsigned int num_col= ors) +{ + unsigned int i; + + printk("{ "); + for ( i =3D 0; i < num_colors; i++ ) + { + unsigned int start =3D colors[i], end =3D start; + + printk("%u", start); + + for ( ; i < num_colors - 1 && end + 1 =3D=3D colors[i + 1]; i++, e= nd++ ) + ; + + if ( start !=3D end ) + printk("-%u", end); + + if ( i < num_colors - 1 ) + printk(", "); + } + printk(" }\n"); +} + +void __init llc_coloring_init(void) +{ + unsigned int way_size; + + if ( (llc_coloring_enabled < 0) && (llc_size && llc_nr_ways) ) + { + llc_coloring_enabled =3D true; + way_size =3D llc_size / llc_nr_ways; + } + else if ( !llc_coloring_enabled ) + return; + else + { + way_size =3D get_llc_way_size(); + if ( !way_size ) + panic("LLC probing failed and 'llc-size' or 'llc-nr-ways' miss= ing\n"); + } + + if ( way_size & ~PAGE_MASK ) + panic("LLC way size must be a multiple of PAGE_SIZE\n"); + + /* + * The maximum number of colors must be a power of 2 in order to corre= ctly + * map them to bits of an address. + */ + max_nr_colors =3D way_size >> PAGE_SHIFT; + + if ( max_nr_colors & (max_nr_colors - 1) ) + panic("Number of LLC colors (%u) isn't a power of 2\n", max_nr_col= ors); + + if ( max_nr_colors > NR_LLC_COLORS ) + { + printk(XENLOG_WARNING + "Number of LLC colors (%u) too big. Using configured max %u= \n", + max_nr_colors, NR_LLC_COLORS); + max_nr_colors =3D NR_LLC_COLORS; + } + else if ( max_nr_colors < 2 ) + panic("Number of LLC colors %u < 2\n", max_nr_colors); + + arch_llc_coloring_init(); +} + +void dump_llc_coloring_info(void) +{ + if ( !llc_coloring_enabled ) + return; + + printk("LLC coloring info:\n"); + printk(" Number of LLC colors supported: %u\n", max_nr_colors); +} + +void domain_dump_llc_colors(const struct domain *d) +{ + if ( !llc_coloring_enabled ) + return; + + printk("%u LLC colors: ", d->num_llc_colors); + print_colors(d->llc_colors, d->num_llc_colors); +} + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * tab-width: 4 + * indent-tabs-mode: nil + * End: + */ diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index 92abed6514..55d561e93c 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -126,6 +126,7 @@ #include #include #include +#include #include #include #include @@ -2644,6 +2645,8 @@ static void cf_check pagealloc_info(unsigned char key) } =20 printk(" Dom heap: %lukB free\n", total << (PAGE_SHIFT-10)); + + dump_llc_coloring_info(); } =20 static __init int cf_check pagealloc_keyhandler_init(void) diff --git a/xen/include/xen/llc-coloring.h b/xen/include/xen/llc-coloring.h new file mode 100644 index 0000000000..0acd8d0ad6 --- /dev/null +++ b/xen/include/xen/llc-coloring.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Last Level Cache (LLC) coloring common header + * + * Copyright (C) 2024, Advanced Micro Devices, Inc. + * Copyright (C) 2024, Minerva Systems SRL + */ +#ifndef __XEN_LLC_COLORING_H__ +#define __XEN_LLC_COLORING_H__ + +struct domain; + +#ifdef CONFIG_LLC_COLORING +void llc_coloring_init(void); +void dump_llc_coloring_info(void); +void domain_dump_llc_colors(const struct domain *d); +#else +static inline void llc_coloring_init(void) {} +static inline void dump_llc_coloring_info(void) {} +static inline void domain_dump_llc_colors(const struct domain *d) {} +#endif + +unsigned int get_llc_way_size(void); +void arch_llc_coloring_init(void); + +#endif /* __XEN_LLC_COLORING_H__ */ + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * tab-width: 4 + * indent-tabs-mode: nil + * End: + */ diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 76e39378b3..bc798a2f61 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -637,6 +637,11 @@ struct domain =20 /* Holding CDF_* constant. Internal flags for domain creation. */ unsigned int cdf; + +#ifdef CONFIG_LLC_COLORING + unsigned int num_llc_colors; + const unsigned int *llc_colors; +#endif }; =20 static inline struct page_list_head *page_to_list( --=20 2.43.0