From patchwork Tue Apr 30 16:49:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Edgar E. Iglesias" X-Patchwork-Id: 13649674 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 330C4C4345F for ; Tue, 30 Apr 2024 16:52:32 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1s1qhJ-0000mo-3U; Tue, 30 Apr 2024 12:51:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1s1qgf-0006Tm-HS for qemu-devel@nongnu.org; Tue, 30 Apr 2024 12:50:39 -0400 Received: from mail-lf1-x132.google.com ([2a00:1450:4864:20::132]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1s1qgZ-00063t-Oh for qemu-devel@nongnu.org; Tue, 30 Apr 2024 12:50:35 -0400 Received: by mail-lf1-x132.google.com with SMTP id 2adb3069b0e04-51abf1a9332so8147592e87.3 for ; Tue, 30 Apr 2024 09:50:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1714495829; x=1715100629; darn=nongnu.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=yOBKxxu7GyLSVYEkd97aCGdSreO6dnD3GZWBKg4jO3k=; b=kyqRgbDcGHfzSSPPytWeWi8QakY0NqOwDDfp8Vpy8r4gA767FMPmMeeBtaak9IVS8S GuRhCnsv2Gq5QB/X5C1LxYjkmMkoo+vH05/4H8kkUR2Oz1L29iSCtyQVAh9RFSsJR4Aa uqSP+5dT0ttoAQRLwNW/jA1ynLCBTE++JHFbNCwSrc7N7hItu2RhW2qa8dwYwpYTgp8n h6T0YUj6P11VcPlqpHcPIDikQBO69LP03XdlfJEq3012HbJqFEa1VTjrOofp62u+AfUQ lwKOTPj/ImjY+dwUgTEP5Je7oFraeGNrmNxiNs5zVLCDub7Xkjd4ke4kuphZnEluuHfE rTlA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1714495829; x=1715100629; 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=yOBKxxu7GyLSVYEkd97aCGdSreO6dnD3GZWBKg4jO3k=; b=mYZnK3X96TbyNmTG4IAOOIKM3Z3hs8I22TSSlY3N1ZuHLk9jB2TjCYPRSXKWBTzQtC 6zuNKb6AK8041XU7z7l4JZjSkPrsDCl4nBSc+x0Wk+EIQJUHg9IgdOOlcKS3cLscaY6T PPNeH1t34BzLW2bm/oSTcDisVM437lSXA902+5bIn0DcPNz51jMrlSa62qqk2KIBW3SK M2dnnMSnydn6WBUcJTa3WLwUSuim4TQfYIwuAtasrbcFKgz4wDM0mPTgLKb8RhmvHYE/ rMNcCP7PAOh/BSCrbQMmDaEA+pRk99PENNB+B26jq4c2W+iTFO2h/xwSgiRXF+sAyWtg 9qfQ== X-Gm-Message-State: AOJu0YyMAlh/Kw3n+xy/Cq3oS403zKeisCHHshqZQxfdU7kYqDWnughz dbfBj1TV5okTlSKjIBogIdHcxk6pH4VBHvqOBE/9qWYMmOsz9HaWBG2ePLIt X-Google-Smtp-Source: AGHT+IG1D0QzmbnS0ErFMJ7lJMDglr0F3Y/2LZElzamvzuLYF8jqyCZc9cG7FMYyaCBToshoVVfqkw== X-Received: by 2002:ac2:5327:0:b0:513:1a9c:ae77 with SMTP id f7-20020ac25327000000b005131a9cae77mr26233lfh.52.1714495829133; Tue, 30 Apr 2024 09:50:29 -0700 (PDT) Received: from gmail.com (213-67-3-247-no600.tbcn.telia.com. [213.67.3.247]) by smtp.gmail.com with ESMTPSA id b1-20020ac25621000000b00518b294570asm4561021lff.135.2024.04.30.09.50.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Apr 2024 09:50:28 -0700 (PDT) From: "Edgar E. Iglesias" To: qemu-devel@nongnu.org Cc: edgar.iglesias@gmail.com, sstabellini@kernel.org, jgross@suse.com, "Edgar E. Iglesias" , Anthony Perard , Paul Durrant , xen-devel@lists.xenproject.org Subject: [PATCH v4 11/17] xen: mapcache: Make MCACHE_BUCKET_SHIFT runtime configurable Date: Tue, 30 Apr 2024 18:49:33 +0200 Message-Id: <20240430164939.925307-12-edgar.iglesias@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240430164939.925307-1-edgar.iglesias@gmail.com> References: <20240430164939.925307-1-edgar.iglesias@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::132; envelope-from=edgar.iglesias@gmail.com; helo=mail-lf1-x132.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: "Edgar E. Iglesias" Make MCACHE_BUCKET_SHIFT runtime configurable per cache instance. Signed-off-by: Edgar E. Iglesias Reviewed-by: Stefano Stabellini --- hw/xen/xen-mapcache.c | 52 ++++++++++++++++++++++++++----------------- 1 file changed, 31 insertions(+), 21 deletions(-) diff --git a/hw/xen/xen-mapcache.c b/hw/xen/xen-mapcache.c index 72a7e25e3e..4f98d284dd 100644 --- a/hw/xen/xen-mapcache.c +++ b/hw/xen/xen-mapcache.c @@ -23,13 +23,10 @@ #if HOST_LONG_BITS == 32 -# define MCACHE_BUCKET_SHIFT 16 # define MCACHE_MAX_SIZE (1UL<<31) /* 2GB Cap */ #else -# define MCACHE_BUCKET_SHIFT 20 # define MCACHE_MAX_SIZE (1UL<<35) /* 32GB Cap */ #endif -#define MCACHE_BUCKET_SIZE (1UL << MCACHE_BUCKET_SHIFT) /* This is the size of the virtual address space reserve to QEMU that will not * be use by MapCache. @@ -65,7 +62,8 @@ typedef struct MapCache { /* For most cases (>99.9%), the page address is the same. */ MapCacheEntry *last_entry; unsigned long max_mcache_size; - unsigned int mcache_bucket_shift; + unsigned int bucket_shift; + unsigned long bucket_size; phys_offset_to_gaddr_t phys_offset_to_gaddr; QemuMutex lock; @@ -95,6 +93,7 @@ static inline int test_bits(int nr, int size, const unsigned long *addr) static MapCache *xen_map_cache_init_single(phys_offset_to_gaddr_t f, void *opaque, + unsigned int bucket_shift, unsigned long max_size) { unsigned long size; @@ -108,12 +107,14 @@ static MapCache *xen_map_cache_init_single(phys_offset_to_gaddr_t f, QTAILQ_INIT(&mc->locked_entries); + mc->bucket_shift = bucket_shift; + mc->bucket_size = 1UL << bucket_shift; mc->max_mcache_size = max_size; mc->nr_buckets = (((mc->max_mcache_size >> XC_PAGE_SHIFT) + - (1UL << (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)) - 1) >> - (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)); + (1UL << (bucket_shift - XC_PAGE_SHIFT)) - 1) >> + (bucket_shift - XC_PAGE_SHIFT)); size = mc->nr_buckets * sizeof(MapCacheEntry); size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1); @@ -126,6 +127,13 @@ void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque) { struct rlimit rlimit_as; unsigned long max_mcache_size; + unsigned int bucket_shift; + + if (HOST_LONG_BITS == 32) { + bucket_shift = 16; + } else { + bucket_shift = 20; + } if (geteuid() == 0) { rlimit_as.rlim_cur = RLIM_INFINITY; @@ -146,7 +154,9 @@ void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque) } } - mapcache = xen_map_cache_init_single(f, opaque, max_mcache_size); + mapcache = xen_map_cache_init_single(f, opaque, + bucket_shift, + max_mcache_size); setrlimit(RLIMIT_AS, &rlimit_as); } @@ -195,7 +205,7 @@ static void xen_remap_bucket(MapCache *mc, entry->valid_mapping = NULL; for (i = 0; i < nb_pfn; i++) { - pfns[i] = (address_index << (MCACHE_BUCKET_SHIFT-XC_PAGE_SHIFT)) + i; + pfns[i] = (address_index << (mc->bucket_shift - XC_PAGE_SHIFT)) + i; } /* @@ -266,8 +276,8 @@ static uint8_t *xen_map_cache_unlocked(MapCache *mc, bool dummy = false; tryagain: - address_index = phys_addr >> MCACHE_BUCKET_SHIFT; - address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1); + address_index = phys_addr >> mc->bucket_shift; + address_offset = phys_addr & (mc->bucket_size - 1); trace_xen_map_cache(phys_addr); @@ -294,14 +304,14 @@ tryagain: return mc->last_entry->vaddr_base + address_offset; } - /* size is always a multiple of MCACHE_BUCKET_SIZE */ + /* size is always a multiple of mc->bucket_size */ if (size) { cache_size = size + address_offset; - if (cache_size % MCACHE_BUCKET_SIZE) { - cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE); + if (cache_size % mc->bucket_size) { + cache_size += mc->bucket_size - (cache_size % mc->bucket_size); } } else { - cache_size = MCACHE_BUCKET_SIZE; + cache_size = mc->bucket_size; } entry = &mc->entry[address_index % mc->nr_buckets]; @@ -419,7 +429,7 @@ static ram_addr_t xen_ram_addr_from_mapcache_single(MapCache *mc, void *ptr) trace_xen_ram_addr_from_mapcache_not_in_cache(ptr); raddr = RAM_ADDR_INVALID; } else { - raddr = (reventry->paddr_index << MCACHE_BUCKET_SHIFT) + + raddr = (reventry->paddr_index << mc->bucket_shift) + ((unsigned long) ptr - (unsigned long) entry->vaddr_base); } mapcache_unlock(mc); @@ -582,8 +592,8 @@ static uint8_t *xen_replace_cache_entry_unlocked(MapCache *mc, hwaddr address_index, address_offset; hwaddr test_bit_size, cache_size = size; - address_index = old_phys_addr >> MCACHE_BUCKET_SHIFT; - address_offset = old_phys_addr & (MCACHE_BUCKET_SIZE - 1); + address_index = old_phys_addr >> mc->bucket_shift; + address_offset = old_phys_addr & (mc->bucket_size - 1); assert(size); /* test_bit_size is always a multiple of XC_PAGE_SIZE */ @@ -592,8 +602,8 @@ static uint8_t *xen_replace_cache_entry_unlocked(MapCache *mc, test_bit_size += XC_PAGE_SIZE - (test_bit_size % XC_PAGE_SIZE); } cache_size = size + address_offset; - if (cache_size % MCACHE_BUCKET_SIZE) { - cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE); + if (cache_size % mc->bucket_size) { + cache_size += mc->bucket_size - (cache_size % mc->bucket_size); } entry = &mc->entry[address_index % mc->nr_buckets]; @@ -606,8 +616,8 @@ static uint8_t *xen_replace_cache_entry_unlocked(MapCache *mc, return NULL; } - address_index = new_phys_addr >> MCACHE_BUCKET_SHIFT; - address_offset = new_phys_addr & (MCACHE_BUCKET_SIZE - 1); + address_index = new_phys_addr >> mc->bucket_shift; + address_offset = new_phys_addr & (mc->bucket_size - 1); trace_xen_replace_cache_entry_dummy(old_phys_addr, new_phys_addr);