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[213.67.3.247]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-2e95bcd7c20sm1491561fa.33.2024.05.24.03.51.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 May 2024 03:51:56 -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: a3e90c24-19bb-11ef-b4bb-af5377834399 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1716547916; x=1717152716; 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=oKmmum6z28VcY8ouSg3YJA3bHZvP87XkBXtO/hd8PR8=; b=dQHWug0UlN40N6YIbgnyJtYw6nyjlpIX2Srd7N+YUqHdNXQdbrH7S12OwLtQJJLe2T XmQRLNgf0IpHPvUVlP3XAGjLm37pfjyAWSsgPAOGLIHl11Z/1juo7i8jXh0PqpkOkww/ BmhacJkobhIK2mZtIFTqSdvbwlanNwX8Pe052Q5Hl1DUV0wpDndRUANd1w+ZZbT2nbFf Oy/asv5LBx+brESTw9j+z2fLLADmqOgZ/ad9qx5n6v0NqrbVg5AOWNSmFj+nEY7D2MBe xsHHRXq3Jss4iITLE2UoQBr6gTEwAv5EdR55kG9/WJhLPM9weeJRR+YGTjRqdZN7IDSL 4Vow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716547916; x=1717152716; 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=oKmmum6z28VcY8ouSg3YJA3bHZvP87XkBXtO/hd8PR8=; b=GwyqCGjIFGy4F5T13OtaTp+rmp2/H+weqHpamZN4tGomll4vmMSJ/JSm6Cp6DNkKkB U8fObKoyeERkJ7h3TzQuSW2Nj+c/M2x/Fw0TeptRG/ckxgLUkwpRrTi0/nqZXt+RRZpX EjjyGD5uw62PD6zLuV3RtxgmXoUnxH6zMGCgwzKQApG9vqD/a5pNEygBpqxnyR4yyv5z SmB91gUb6HyQe4H6Q9ORpAtDPZJtpCqjhpvMIQh23K5xykMSsad8iJYhCWZxlYOUi1Dw 5HPl1p+X5OdsYxKePkbw4KJKcYq4CQaqh79IfCkqqauTQNVV/dxModYtytcaQ9ScA8wm XvGQ== X-Forwarded-Encrypted: i=1; AJvYcCWZMFzThER9vTRX30lgcVaX087c5gfSxKhOJziaG6Dpz3P1UqF9n5nl19/kDIiwzA61zn0NpsMMqdkczMVxHMQ5V2WAWdB5HVkucw2k+wY= X-Gm-Message-State: AOJu0YxRUxLK1qYML5HbqelcFxTwC9JMLBvuuuStNNuYoUVD0UYwVQPQ 7k9d0yt93j51g1T/zW5QfP11YhwL+phBERq1D/lf1FSXnIjf/LunHUNTlH+R X-Google-Smtp-Source: AGHT+IEGg/j9kr5jKj/tv+syV4xN0QPHZQ3VcNTdBVPyyQs2WD0/L2C8QLd0gT/jlHUTsM+RTiWqvg== X-Received: by 2002:a2e:b784:0:b0:2e0:6313:fe3a with SMTP id 38308e7fff4ca-2e95b256875mr16230641fa.35.1716547916526; Fri, 24 May 2024 03:51:56 -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 v7 1/8] xen: mapcache: Make MCACHE_BUCKET_SHIFT runtime configurable Date: Fri, 24 May 2024 12:51:45 +0200 Message-Id: <20240524105152.1301842-2-edgar.iglesias@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240524105152.1301842-1-edgar.iglesias@gmail.com> References: <20240524105152.1301842-1-edgar.iglesias@gmail.com> MIME-Version: 1.0 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 | 54 ++++++++++++++++++++++++++----------------- 1 file changed, 33 insertions(+), 21 deletions(-) diff --git a/hw/xen/xen-mapcache.c b/hw/xen/xen-mapcache.c index fa6813b1ad..bc860f4373 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; @@ -95,11 +93,14 @@ 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; MapCache *mc; + assert(bucket_shift >= XC_PAGE_SHIFT); + mc = g_new0(MapCache, 1); mc->phys_offset_to_gaddr = f; @@ -108,12 +109,14 @@ 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 +129,13 @@ 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 +156,9 @@ 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 +207,7 @@ 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 +278,8 @@ 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 +306,14 @@ 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]; @@ -422,7 +434,7 @@ 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); @@ -585,8 +597,8 @@ 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 */ @@ -595,8 +607,8 @@ 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]; @@ -609,8 +621,8 @@ 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);