From patchwork Mon Mar 6 14:13:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 13161262 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EFBB8C6FD1C for ; Mon, 6 Mar 2023 14:20:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229707AbjCFOU3 (ORCPT ); Mon, 6 Mar 2023 09:20:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52644 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231388AbjCFOTw (ORCPT ); Mon, 6 Mar 2023 09:19:52 -0500 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EAA7D448D; Mon, 6 Mar 2023 06:19:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678112345; x=1709648345; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=xci5WG0k+f/0Um3+k+Oe8afMa9mtUe76NlmilpanBT8=; b=gTuSL8B7QhIlZnK8/muCtbdbZA3AkkqLWOZXZYubuLqaHIylHhNPED1G pt+zibt6Uq3C2MOEHozyBtpP3txHv7I1on/byzOOvb1SJzW135E9EQqQd l/u7JOLmRpaLHf8hSSntfTs+z2kDFpWDtb/K7M9L//Ctay7us4h2R362z EjkUcNYfOBJIgZqfCz3xrerqo4t68ueyLaK5GTqqnojtPCKJtyMbwVKRy NeOFxqNArUwwI1NIjqJ6fDkA/otwHKXZB7OqeVVTbBsXfob/RTFeYv3nd 9v9NHlcv2iNnV5Kv2RYSudv5Ll+ARIJ/Ew4E6BHogL4XWsMUE5Ho4uTxS A==; X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="337080242" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="337080242" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Mar 2023 06:15:23 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="765232434" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="765232434" Received: from jwhisle1-mobl2.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.212.92.57]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Mar 2023 06:15:18 -0800 From: Kai Huang To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: linux-mm@kvack.org, dave.hansen@intel.com, peterz@infradead.org, tglx@linutronix.de, seanjc@google.com, pbonzini@redhat.com, dan.j.williams@intel.com, rafael.j.wysocki@intel.com, kirill.shutemov@linux.intel.com, ying.huang@intel.com, reinette.chatre@intel.com, len.brown@intel.com, tony.luck@intel.com, ak@linux.intel.com, isaku.yamahata@intel.com, chao.gao@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, david@redhat.com, bagasdotme@gmail.com, sagis@google.com, imammedo@redhat.com, kai.huang@intel.com Subject: [PATCH v10 11/16] x86/virt/tdx: Designate reserved areas for all TDMRs Date: Tue, 7 Mar 2023 03:13:56 +1300 Message-Id: <602d53e58b15d0593a489f59ef27953d6b2b0ece.1678111292.git.kai.huang@intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org As the last step of constructing TDMRs, populate reserved areas for all TDMRs. For each TDMR, put all memory holes within this TDMR to the reserved areas. And for all PAMTs which overlap with this TDMR, put all the overlapping parts to reserved areas too. Signed-off-by: Kai Huang Reviewed-by: Isaku Yamahata --- v9 -> v10: - No change. v8 -> v9: - Added comment around 'tdmr_add_rsvd_area()' to point out it doesn't do optimization to save reserved areas. (Dave). v7 -> v8: (Dave) - "set_up" -> "populate" in function name change (Dave). - Improved comment suggested by Dave. - Other changes due to 'struct tdmr_info_list'. v6 -> v7: - No change. v5 -> v6: - Rebase due to using 'tdx_memblock' instead of memblock. - Split tdmr_set_up_rsvd_areas() into two functions to handle memory hole and PAMT respectively. - Added Isaku's Reviewed-by. --- arch/x86/virt/vmx/tdx/tdx.c | 220 ++++++++++++++++++++++++++++++++++-- 1 file changed, 212 insertions(+), 8 deletions(-) diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c index 8f66cab1902e..99d2e8d939d3 100644 --- a/arch/x86/virt/vmx/tdx/tdx.c +++ b/arch/x86/virt/vmx/tdx/tdx.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include @@ -792,6 +793,210 @@ static unsigned long tdmrs_count_pamt_pages(struct tdmr_info_list *tdmr_list) return pamt_npages; } +static int tdmr_add_rsvd_area(struct tdmr_info *tdmr, int *p_idx, u64 addr, + u64 size, u16 max_reserved_per_tdmr) +{ + struct tdmr_reserved_area *rsvd_areas = tdmr->reserved_areas; + int idx = *p_idx; + + /* Reserved area must be 4K aligned in offset and size */ + if (WARN_ON(addr & ~PAGE_MASK || size & ~PAGE_MASK)) + return -EINVAL; + + if (idx >= max_reserved_per_tdmr) { + pr_warn("initialization failed: TDMR [0x%llx, 0x%llx): reserved areas exhausted.\n", + tdmr->base, tdmr_end(tdmr)); + return -ENOSPC; + } + + /* + * Consume one reserved area per call. Make no effort to + * optimize or reduce the number of reserved areas which are + * consumed by contiguous reserved areas, for instance. + */ + rsvd_areas[idx].offset = addr - tdmr->base; + rsvd_areas[idx].size = size; + + *p_idx = idx + 1; + + return 0; +} + +/* + * Go through @tmb_list to find holes between memory areas. If any of + * those holes fall within @tdmr, set up a TDMR reserved area to cover + * the hole. + */ +static int tdmr_populate_rsvd_holes(struct list_head *tmb_list, + struct tdmr_info *tdmr, + int *rsvd_idx, + u16 max_reserved_per_tdmr) +{ + struct tdx_memblock *tmb; + u64 prev_end; + int ret; + + /* + * Start looking for reserved blocks at the + * beginning of the TDMR. + */ + prev_end = tdmr->base; + list_for_each_entry(tmb, tmb_list, list) { + u64 start, end; + + start = PFN_PHYS(tmb->start_pfn); + end = PFN_PHYS(tmb->end_pfn); + + /* Break if this region is after the TDMR */ + if (start >= tdmr_end(tdmr)) + break; + + /* Exclude regions before this TDMR */ + if (end < tdmr->base) + continue; + + /* + * Skip over memory areas that + * have already been dealt with. + */ + if (start <= prev_end) { + prev_end = end; + continue; + } + + /* Add the hole before this region */ + ret = tdmr_add_rsvd_area(tdmr, rsvd_idx, prev_end, + start - prev_end, + max_reserved_per_tdmr); + if (ret) + return ret; + + prev_end = end; + } + + /* Add the hole after the last region if it exists. */ + if (prev_end < tdmr_end(tdmr)) { + ret = tdmr_add_rsvd_area(tdmr, rsvd_idx, prev_end, + tdmr_end(tdmr) - prev_end, + max_reserved_per_tdmr); + if (ret) + return ret; + } + + return 0; +} + +/* + * Go through @tdmr_list to find all PAMTs. If any of those PAMTs + * overlaps with @tdmr, set up a TDMR reserved area to cover the + * overlapping part. + */ +static int tdmr_populate_rsvd_pamts(struct tdmr_info_list *tdmr_list, + struct tdmr_info *tdmr, + int *rsvd_idx, + u16 max_reserved_per_tdmr) +{ + int i, ret; + + for (i = 0; i < tdmr_list->nr_consumed_tdmrs; i++) { + struct tdmr_info *tmp = tdmr_entry(tdmr_list, i); + unsigned long pamt_start_pfn, pamt_npages; + u64 pamt_start, pamt_end; + + tdmr_get_pamt(tmp, &pamt_start_pfn, &pamt_npages); + /* Each TDMR must already have PAMT allocated */ + WARN_ON_ONCE(!pamt_npages || !pamt_start_pfn); + + pamt_start = PFN_PHYS(pamt_start_pfn); + pamt_end = PFN_PHYS(pamt_start_pfn + pamt_npages); + + /* Skip PAMTs outside of the given TDMR */ + if ((pamt_end <= tdmr->base) || + (pamt_start >= tdmr_end(tdmr))) + continue; + + /* Only mark the part within the TDMR as reserved */ + if (pamt_start < tdmr->base) + pamt_start = tdmr->base; + if (pamt_end > tdmr_end(tdmr)) + pamt_end = tdmr_end(tdmr); + + ret = tdmr_add_rsvd_area(tdmr, rsvd_idx, pamt_start, + pamt_end - pamt_start, + max_reserved_per_tdmr); + if (ret) + return ret; + } + + return 0; +} + +/* Compare function called by sort() for TDMR reserved areas */ +static int rsvd_area_cmp_func(const void *a, const void *b) +{ + struct tdmr_reserved_area *r1 = (struct tdmr_reserved_area *)a; + struct tdmr_reserved_area *r2 = (struct tdmr_reserved_area *)b; + + if (r1->offset + r1->size <= r2->offset) + return -1; + if (r1->offset >= r2->offset + r2->size) + return 1; + + /* Reserved areas cannot overlap. The caller must guarantee. */ + WARN_ON_ONCE(1); + return -1; +} + +/* + * Populate reserved areas for the given @tdmr, including memory holes + * (via @tmb_list) and PAMTs (via @tdmr_list). + */ +static int tdmr_populate_rsvd_areas(struct tdmr_info *tdmr, + struct list_head *tmb_list, + struct tdmr_info_list *tdmr_list, + u16 max_reserved_per_tdmr) +{ + int ret, rsvd_idx = 0; + + ret = tdmr_populate_rsvd_holes(tmb_list, tdmr, &rsvd_idx, + max_reserved_per_tdmr); + if (ret) + return ret; + + ret = tdmr_populate_rsvd_pamts(tdmr_list, tdmr, &rsvd_idx, + max_reserved_per_tdmr); + if (ret) + return ret; + + /* TDX requires reserved areas listed in address ascending order */ + sort(tdmr->reserved_areas, rsvd_idx, sizeof(struct tdmr_reserved_area), + rsvd_area_cmp_func, NULL); + + return 0; +} + +/* + * Populate reserved areas for all TDMRs in @tdmr_list, including memory + * holes (via @tmb_list) and PAMTs. + */ +static int tdmrs_populate_rsvd_areas_all(struct tdmr_info_list *tdmr_list, + struct list_head *tmb_list, + u16 max_reserved_per_tdmr) +{ + int i; + + for (i = 0; i < tdmr_list->nr_consumed_tdmrs; i++) { + int ret; + + ret = tdmr_populate_rsvd_areas(tdmr_entry(tdmr_list, i), + tmb_list, tdmr_list, max_reserved_per_tdmr); + if (ret) + return ret; + } + + return 0; +} + /* * Construct a list of TDMRs on the preallocated space in @tdmr_list * to cover all TDX memory regions in @tmb_list based on the TDX module @@ -811,14 +1016,13 @@ static int construct_tdmrs(struct list_head *tmb_list, sysinfo->pamt_entry_size); if (ret) return ret; - /* - * TODO: - * - * - Designate reserved areas for each TDMR. - * - * Return -EINVAL until constructing TDMRs is done - */ - return -EINVAL; + + ret = tdmrs_populate_rsvd_areas_all(tdmr_list, tmb_list, + sysinfo->max_reserved_per_tdmr); + if (ret) + tdmrs_free_pamt_all(tdmr_list); + + return ret; } static int init_tdx_module(void)