From patchwork Wed Nov 15 07:14:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiaoyao Li X-Patchwork-Id: 13456320 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7E16C3D9F for ; Wed, 15 Nov 2023 07:21:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="f5BHMbgc" Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31ABCF4 for ; Tue, 14 Nov 2023 23:21:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700032882; x=1731568882; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ZgD+c7cgl4xI9mSHGyCukzqHgX84Y6X00rtUW2LkDpQ=; b=f5BHMbgcAIYBH+NpZbJywKGdqqZ0phics0SKzu8nVsWGtS8Umvr1zFtw AH+c5EHDr1UFizMSpyyv5OWuHfzQtm1wjfnth+dJMH4xH+618pvHEykEz Ick9nSOEw2JvNSAlPGHCLX9BAprAnwgrVLCgZPzU1txwE5QD7kNJmzVtP kgnC01QKFvoaKQVzx7wQxoKtpBj49o0pT2NXne69W4BQIt1GEhVGbXxWW C8UK5qg14mmtMM1+vWjRejygwHzveFAY4gAcImnqnpfh41PgOad1tAx09 LrKlyKuEunW0JuAAeCfxn1BwdvNLvnLPwJR8svXqTHUfgnozY3NhZ0uWn A==; X-IronPort-AV: E=McAfee;i="6600,9927,10894"; a="390623264" X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="390623264" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Nov 2023 23:21:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10894"; a="714800007" X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="714800007" Received: from lxy-clx-4s.sh.intel.com ([10.239.48.52]) by orsmga003.jf.intel.com with ESMTP; 14 Nov 2023 23:21:06 -0800 From: Xiaoyao Li To: Paolo Bonzini , David Hildenbrand , Igor Mammedov , "Michael S . Tsirkin" , Marcel Apfelbaum , Richard Henderson , Peter Xu , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Cornelia Huck , =?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= , Eric Blake , Markus Armbruster , Marcelo Tosatti Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, xiaoyao.li@intel.com, Michael Roth , Sean Christopherson , Claudio Fontana , Gerd Hoffmann , Isaku Yamahata , Chenyi Qiang Subject: [PATCH v3 43/70] i386/tdx: Track RAM entries for TDX VM Date: Wed, 15 Nov 2023 02:14:52 -0500 Message-Id: <20231115071519.2864957-44-xiaoyao.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231115071519.2864957-1-xiaoyao.li@intel.com> References: <20231115071519.2864957-1-xiaoyao.li@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The RAM of TDX VM can be classified into two types: - TDX_RAM_UNACCEPTED: default type of TDX memory, which needs to be accepted by TDX guest before it can be used and will be all-zeros after being accepted. - TDX_RAM_ADDED: the RAM that is ADD'ed to TD guest before running, and can be used directly. E.g., TD HOB and TEMP MEM that needed by TDVF. Maintain TdxRamEntries[] which grabs the initial RAM info from e820 table and mark each RAM range as default type TDX_RAM_UNACCEPTED. Then turn the range of TD HOB and TEMP MEM to TDX_RAM_ADDED since these ranges will be ADD'ed before TD runs and no need to be accepted runtime. The TdxRamEntries[] are later used to setup the memory TD resource HOB that passes memory info from QEMU to TDVF. Signed-off-by: Xiaoyao Li Acked-by: Gerd Hoffmann --- Changes in v3: - use enum TdxRamType in struct TdxRamEntry; (Isaku) - Fix the indention; (Daniel) Changes in v1: - simplify the algorithm of tdx_accept_ram_range() (Suggested-by: Gerd Hoffman) (1) Change the existing entry to cover the accepted ram range. (2) If there is room before the accepted ram range add a TDX_RAM_UNACCEPTED entry for that. (3) If there is room after the accepted ram range add a TDX_RAM_UNACCEPTED entry for that. --- target/i386/kvm/tdx.c | 111 ++++++++++++++++++++++++++++++++++++++++++ target/i386/kvm/tdx.h | 14 ++++++ 2 files changed, 125 insertions(+) diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c index 03c7f7ab2720..8b60d1c65a7d 100644 --- a/target/i386/kvm/tdx.c +++ b/target/i386/kvm/tdx.c @@ -22,6 +22,7 @@ #include "sysemu/sysemu.h" #include "exec/address-spaces.h" +#include "hw/i386/e820_memory_layout.h" #include "hw/i386/x86.h" #include "hw/i386/tdvf.h" #include "kvm_i386.h" @@ -459,11 +460,117 @@ static void update_tdx_cpuid_lookup_by_tdx_caps(void) (tdx_caps->xfam_fixed1 & CPUID_XSTATE_XSS_MASK) >> 32; } +static void tdx_add_ram_entry(uint64_t address, uint64_t length, + enum TdxRamType type) +{ + uint32_t nr_entries = tdx_guest->nr_ram_entries; + tdx_guest->ram_entries = g_renew(TdxRamEntry, tdx_guest->ram_entries, + nr_entries + 1); + + tdx_guest->ram_entries[nr_entries].address = address; + tdx_guest->ram_entries[nr_entries].length = length; + tdx_guest->ram_entries[nr_entries].type = type; + tdx_guest->nr_ram_entries++; +} + +static int tdx_accept_ram_range(uint64_t address, uint64_t length) +{ + uint64_t head_start, tail_start, head_length, tail_length; + uint64_t tmp_address, tmp_length; + TdxRamEntry *e; + int i; + + for (i = 0; i < tdx_guest->nr_ram_entries; i++) { + e = &tdx_guest->ram_entries[i]; + + if (address + length <= e->address || + e->address + e->length <= address) { + continue; + } + + /* + * The to-be-accepted ram range must be fully contained by one + * RAM entry. + */ + if (e->address > address || + e->address + e->length < address + length) { + return -EINVAL; + } + + if (e->type == TDX_RAM_ADDED) { + return -EINVAL; + } + + break; + } + + if (i == tdx_guest->nr_ram_entries) { + return -1; + } + + tmp_address = e->address; + tmp_length = e->length; + + e->address = address; + e->length = length; + e->type = TDX_RAM_ADDED; + + head_length = address - tmp_address; + if (head_length > 0) { + head_start = tmp_address; + tdx_add_ram_entry(head_start, head_length, TDX_RAM_UNACCEPTED); + } + + tail_start = address + length; + if (tail_start < tmp_address + tmp_length) { + tail_length = tmp_address + tmp_length - tail_start; + tdx_add_ram_entry(tail_start, tail_length, TDX_RAM_UNACCEPTED); + } + + return 0; +} + +static int tdx_ram_entry_compare(const void *lhs_, const void* rhs_) +{ + const TdxRamEntry *lhs = lhs_; + const TdxRamEntry *rhs = rhs_; + + if (lhs->address == rhs->address) { + return 0; + } + if (le64_to_cpu(lhs->address) > le64_to_cpu(rhs->address)) { + return 1; + } + return -1; +} + +static void tdx_init_ram_entries(void) +{ + unsigned i, j, nr_e820_entries; + + nr_e820_entries = e820_get_num_entries(); + tdx_guest->ram_entries = g_new(TdxRamEntry, nr_e820_entries); + + for (i = 0, j = 0; i < nr_e820_entries; i++) { + uint64_t addr, len; + + if (e820_get_entry(i, E820_RAM, &addr, &len)) { + tdx_guest->ram_entries[j].address = addr; + tdx_guest->ram_entries[j].length = len; + tdx_guest->ram_entries[j].type = TDX_RAM_UNACCEPTED; + j++; + } + } + tdx_guest->nr_ram_entries = j; +} + static void tdx_finalize_vm(Notifier *notifier, void *unused) { TdxFirmware *tdvf = &tdx_guest->tdvf; TdxFirmwareEntry *entry; + tdx_init_ram_entries(); + for_each_tdx_fw_entry(tdvf, entry) { switch (entry->type) { case TDVF_SECTION_TYPE_BFV: @@ -474,12 +581,16 @@ static void tdx_finalize_vm(Notifier *notifier, void *unused) case TDVF_SECTION_TYPE_TEMP_MEM: entry->mem_ptr = qemu_ram_mmap(-1, entry->size, qemu_real_host_page_size(), 0, 0); + tdx_accept_ram_range(entry->address, entry->size); break; default: error_report("Unsupported TDVF section %d", entry->type); exit(1); } } + + qsort(tdx_guest->ram_entries, tdx_guest->nr_ram_entries, + sizeof(TdxRamEntry), &tdx_ram_entry_compare); } static Notifier tdx_machine_done_notify = { diff --git a/target/i386/kvm/tdx.h b/target/i386/kvm/tdx.h index a46af433135f..3a35a2bc0900 100644 --- a/target/i386/kvm/tdx.h +++ b/target/i386/kvm/tdx.h @@ -15,6 +15,17 @@ typedef struct TdxGuestClass { ConfidentialGuestSupportClass parent_class; } TdxGuestClass; +enum TdxRamType{ + TDX_RAM_UNACCEPTED, + TDX_RAM_ADDED, +}; + +typedef struct TdxRamEntry { + uint64_t address; + uint64_t length; + enum TdxRamType type; +} TdxRamEntry; + typedef struct TdxGuest { ConfidentialGuestSupport parent_obj; @@ -27,6 +38,9 @@ typedef struct TdxGuest { char *mrownerconfig; /* base64 encoded sha348 digest */ TdxFirmware tdvf; + + uint32_t nr_ram_entries; + TdxRamEntry *ram_entries; } TdxGuest; #ifdef CONFIG_TDX