From patchwork Thu Sep 26 13:53:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Chao Gao X-Patchwork-Id: 11162791 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 62B7017D4 for ; Thu, 26 Sep 2019 13:51:19 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3D209207FF for ; Thu, 26 Sep 2019 13:51:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3D209207FF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1iDU9c-000266-GP; Thu, 26 Sep 2019 13:49:56 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1iDU9b-00025f-8E for xen-devel@lists.xenproject.org; Thu, 26 Sep 2019 13:49:55 +0000 X-Inumbo-ID: 7f0a89b2-e064-11e9-8628-bc764e2007e4 Received: from mga04.intel.com (unknown [192.55.52.120]) by localhost (Halon) with ESMTPS id 7f0a89b2-e064-11e9-8628-bc764e2007e4; Thu, 26 Sep 2019 13:49:45 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Sep 2019 06:49:44 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,552,1559545200"; d="scan'208";a="189126035" Received: from gao-cwp.sh.intel.com ([10.239.159.26]) by fmsmga008.fm.intel.com with ESMTP; 26 Sep 2019 06:49:42 -0700 From: Chao Gao To: xen-devel@lists.xenproject.org Date: Thu, 26 Sep 2019 21:53:31 +0800 Message-Id: <1569506015-26938-4-git-send-email-chao.gao@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1569506015-26938-1-git-send-email-chao.gao@intel.com> References: <1569506015-26938-1-git-send-email-chao.gao@intel.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v11 3/7] microcode: reduce memory allocation and copy when creating a patch X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Sergey Dyasli , Ashok Raj , Wei Liu , Andrew Cooper , Jan Beulich , Chao Gao , =?utf-8?q?R?= =?utf-8?q?oger_Pau_Monn=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To create a microcode patch from a vendor-specific update, allocate_microcode_patch() copied everything from the update. It is not efficient. Essentially, we just need to go through ucodes in the blob, find the one with the newest revision and install it into the microcode_patch. In the process, buffers like mc_amd, equiv_cpu_table (on AMD side), and mc (on Intel side) can be reused. microcode_patch now is allocated after it is sure that there is a matching ucode. Signed-off-by: Chao Gao Reviewed-by: Roger Pau Monné Reviewed-by: Jan Beulich --- Changes in v11: - correct parameter type issues of get_next_ucode_from_buffer Changes in v10: - avoid unnecessary type casting * introduce compare_header on AMD side * specify the type of the first parameter of get_next_ucode_from_buffer() on Intel side Changes in v9: - new --- xen/arch/x86/microcode_amd.c | 112 +++++++++++++++++------------------------ xen/arch/x86/microcode_intel.c | 67 +++++++++--------------- 2 files changed, 69 insertions(+), 110 deletions(-) diff --git a/xen/arch/x86/microcode_amd.c b/xen/arch/x86/microcode_amd.c index 0199308..9a8f179 100644 --- a/xen/arch/x86/microcode_amd.c +++ b/xen/arch/x86/microcode_amd.c @@ -194,36 +194,6 @@ static bool match_cpu(const struct microcode_patch *patch) return patch && (microcode_fits(patch->mc_amd) == NEW_UCODE); } -static struct microcode_patch *alloc_microcode_patch( - const struct microcode_amd *mc_amd) -{ - struct microcode_patch *microcode_patch = xmalloc(struct microcode_patch); - struct microcode_amd *cache = xmalloc(struct microcode_amd); - void *mpb = xmalloc_bytes(mc_amd->mpb_size); - struct equiv_cpu_entry *equiv_cpu_table = - xmalloc_bytes(mc_amd->equiv_cpu_table_size); - - if ( !microcode_patch || !cache || !mpb || !equiv_cpu_table ) - { - xfree(microcode_patch); - xfree(cache); - xfree(mpb); - xfree(equiv_cpu_table); - return ERR_PTR(-ENOMEM); - } - - memcpy(mpb, mc_amd->mpb, mc_amd->mpb_size); - cache->mpb = mpb; - cache->mpb_size = mc_amd->mpb_size; - memcpy(equiv_cpu_table, mc_amd->equiv_cpu_table, - mc_amd->equiv_cpu_table_size); - cache->equiv_cpu_table = equiv_cpu_table; - cache->equiv_cpu_table_size = mc_amd->equiv_cpu_table_size; - microcode_patch->mc_amd = cache; - - return microcode_patch; -} - static void free_patch(void *mc) { struct microcode_amd *mc_amd = mc; @@ -236,6 +206,17 @@ static void free_patch(void *mc) } } +static enum microcode_match_result compare_header( + const struct microcode_header_amd *new_header, + const struct microcode_header_amd *old_header) +{ + if ( new_header->processor_rev_id == old_header->processor_rev_id ) + return (new_header->patch_id > old_header->patch_id) ? NEW_UCODE + : OLD_UCODE; + + return MIS_UCODE; +} + static enum microcode_match_result compare_patch( const struct microcode_patch *new, const struct microcode_patch *old) { @@ -246,11 +227,7 @@ static enum microcode_match_result compare_patch( ASSERT(microcode_fits(new->mc_amd) != MIS_UCODE); ASSERT(microcode_fits(new->mc_amd) != MIS_UCODE); - if ( new_header->processor_rev_id == old_header->processor_rev_id ) - return (new_header->patch_id > old_header->patch_id) ? - NEW_UCODE : OLD_UCODE; - - return MIS_UCODE; + return compare_header(new_header, old_header); } static int apply_microcode(const struct microcode_patch *patch) @@ -328,18 +305,10 @@ static int get_ucode_from_buffer_amd( return -EINVAL; } - if ( mc_amd->mpb_size < mpbuf->len ) - { - if ( mc_amd->mpb ) - { - xfree(mc_amd->mpb); - mc_amd->mpb_size = 0; - } - mc_amd->mpb = xmalloc_bytes(mpbuf->len); - if ( mc_amd->mpb == NULL ) - return -ENOMEM; - mc_amd->mpb_size = mpbuf->len; - } + mc_amd->mpb = xmalloc_bytes(mpbuf->len); + if ( !mc_amd->mpb ) + return -ENOMEM; + mc_amd->mpb_size = mpbuf->len; memcpy(mc_amd->mpb, mpbuf->data, mpbuf->len); pr_debug("microcode: CPU%d size %zu, block size %u offset %zu equivID %#x rev %#x\n", @@ -459,8 +428,9 @@ static struct microcode_patch *cpu_request_microcode(const void *buf, size_t bufsize) { struct microcode_amd *mc_amd; + struct microcode_header_amd *saved = NULL; struct microcode_patch *patch = NULL; - size_t offset = 0; + size_t offset = 0, saved_size = 0; int error = 0; unsigned int current_cpu_id; unsigned int equiv_cpu_id; @@ -550,29 +520,22 @@ static struct microcode_patch *cpu_request_microcode(const void *buf, while ( (error = get_ucode_from_buffer_amd(mc_amd, buf, bufsize, &offset)) == 0 ) { - struct microcode_patch *new_patch = alloc_microcode_patch(mc_amd); - - if ( IS_ERR(new_patch) ) - { - error = PTR_ERR(new_patch); - break; - } - /* - * If the new patch covers current CPU, compare patches and store the + * If the new ucode covers current CPU, compare ucodes and store the * one with higher revision. */ - if ( (microcode_fits(new_patch->mc_amd) != MIS_UCODE) && - (!patch || (compare_patch(new_patch, patch) == NEW_UCODE)) ) + if ( (microcode_fits(mc_amd) != MIS_UCODE) && + (!saved || (compare_header(mc_amd->mpb, saved) == NEW_UCODE)) ) { - struct microcode_patch *tmp = patch; - - patch = new_patch; - new_patch = tmp; + xfree(saved); + saved = mc_amd->mpb; + saved_size = mc_amd->mpb_size; + } + else + { + xfree(mc_amd->mpb); + mc_amd->mpb = NULL; } - - if ( new_patch ) - microcode_free_patch(new_patch); if ( offset >= bufsize ) break; @@ -601,7 +564,22 @@ static struct microcode_patch *cpu_request_microcode(const void *buf, *(const uint32_t *)(buf + offset) == UCODE_MAGIC ) break; } - free_patch(mc_amd); + + if ( saved ) + { + mc_amd->mpb = saved; + mc_amd->mpb_size = saved_size; + patch = xmalloc(struct microcode_patch); + if ( patch ) + patch->mc_amd = mc_amd; + else + { + free_patch(mc_amd); + error = -ENOMEM; + } + } + else + free_patch(mc_amd); out: if ( error && !patch ) diff --git a/xen/arch/x86/microcode_intel.c b/xen/arch/x86/microcode_intel.c index 1b3ac93..c083e17 100644 --- a/xen/arch/x86/microcode_intel.c +++ b/xen/arch/x86/microcode_intel.c @@ -285,25 +285,6 @@ static enum microcode_match_result compare_patch( : OLD_UCODE; } -static struct microcode_patch *alloc_microcode_patch( - const struct microcode_header_intel *mc_header) -{ - unsigned long total_size = get_totalsize(mc_header); - void *new_mc = xmalloc_bytes(total_size); - struct microcode_patch *new_patch = xmalloc(struct microcode_patch); - - if ( !new_patch || !new_mc ) - { - xfree(new_patch); - xfree(new_mc); - return ERR_PTR(-ENOMEM); - } - memcpy(new_mc, mc_header, total_size); - new_patch->mc_intel = new_mc; - - return new_patch; -} - static int apply_microcode(const struct microcode_patch *patch) { unsigned long flags; @@ -352,8 +333,9 @@ static int apply_microcode(const struct microcode_patch *patch) return 0; } -static long get_next_ucode_from_buffer(void **mc, const u8 *buf, - unsigned long size, long offset) +static long get_next_ucode_from_buffer(struct microcode_intel **mc, + const uint8_t *buf, unsigned long size, + unsigned long offset) { struct microcode_header_intel *mc_header; unsigned long total_size; @@ -385,47 +367,46 @@ static struct microcode_patch *cpu_request_microcode(const void *buf, { long offset = 0; int error = 0; - void *mc; + struct microcode_intel *mc, *saved = NULL; struct microcode_patch *patch = NULL; while ( (offset = get_next_ucode_from_buffer(&mc, buf, size, offset)) > 0 ) { - struct microcode_patch *new_patch; - error = microcode_sanity_check(mc); if ( error ) - break; - - new_patch = alloc_microcode_patch(mc); - if ( IS_ERR(new_patch) ) { - error = PTR_ERR(new_patch); + xfree(mc); break; } /* - * If the new patch covers current CPU, compare patches and store the + * If the new update covers current CPU, compare updates and store the * one with higher revision. */ - if ( (microcode_update_match(&new_patch->mc_intel->hdr) != MIS_UCODE) && - (!patch || (compare_patch(new_patch, patch) == NEW_UCODE)) ) + if ( (microcode_update_match(&mc->hdr) != MIS_UCODE) && + (!saved || (mc->hdr.rev > saved->hdr.rev)) ) { - struct microcode_patch *tmp = patch; - - patch = new_patch; - new_patch = tmp; + xfree(saved); + saved = mc; } - - if ( new_patch ) - microcode_free_patch(new_patch); - - xfree(mc); + else + xfree(mc); } - if ( offset > 0 ) - xfree(mc); if ( offset < 0 ) error = offset; + if ( saved ) + { + patch = xmalloc(struct microcode_patch); + if ( patch ) + patch->mc_intel = saved; + else + { + xfree(saved); + error = -ENOMEM; + } + } + if ( error && !patch ) patch = ERR_PTR(error);