From nobody Wed May 14 12:28:55 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=none (zoho.com: 198.145.21.10 is neither permitted nor denied by domain of lists.01.org) smtp.mailfrom=edk2-devel-bounces@lists.01.org Return-Path: Received: from ml01.01.org (ml01.01.org [198.145.21.10]) by mx.zohomail.com with SMTPS id 1510783038952246.61182805254361; Wed, 15 Nov 2017 13:57:18 -0800 (PST) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 7C3B421B00DF4; Wed, 15 Nov 2017 13:53:04 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id F3C4B21B00DEE for ; Wed, 15 Nov 2017 13:53:02 -0800 (PST) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 92D054E341; Wed, 15 Nov 2017 21:57:11 +0000 (UTC) Received: from lacos-laptop-7.usersys.redhat.com (ovpn-122-47.rdu2.redhat.com [10.10.122.47]) by smtp.corp.redhat.com (Postfix) with ESMTP id 976E19ECE4; Wed, 15 Nov 2017 21:57:10 +0000 (UTC) X-Original-To: edk2-devel@lists.01.org Received-SPF: none (zoho.com: 198.145.21.10 is neither permitted nor denied by domain of lists.01.org) client-ip=198.145.21.10; envelope-from=edk2-devel-bounces@lists.01.org; helo=ml01.01.org; Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=209.132.183.28; helo=mx1.redhat.com; envelope-from=lersek@redhat.com; receiver=edk2-devel@lists.01.org From: Laszlo Ersek To: edk2-devel-01 Date: Wed, 15 Nov 2017 22:57:02 +0100 Message-Id: <20171115215703.16491-4-lersek@redhat.com> In-Reply-To: <20171115215703.16491-1-lersek@redhat.com> References: <20171115215703.16491-1-lersek@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Wed, 15 Nov 2017 21:57:11 +0000 (UTC) Subject: [edk2] [PATCH v2 3/4] OvmfPkg/Sec/X64: seed the temporary RAM with PcdInitValueInTempStack X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jordan Justen , Ard Biesheuvel MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Errors-To: edk2-devel-bounces@lists.01.org Sender: "edk2-devel" X-ZohoMail: RSF_4 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" This allows the PEI core to report the maximum temporary SEC/PEI stack usage on the DEBUG_INFO level, in the PeiCheckAndSwitchStack() function [MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c]: * Normal boot: > Temp Stack : BaseAddress=3D0x814000 Length=3D0x4000 > Temp Heap : BaseAddress=3D0x810000 Length=3D0x4000 > Total temporary memory: 32768 bytes. > temporary memory stack ever used: 5080 bytes. <---- > temporary memory heap used for HobList: 8080 bytes. > temporary memory heap occupied by memory pages: 0 bytes. * S3 resume (no SMM / PEI decompression) > Temp Stack : BaseAddress=3D0x814000 Length=3D0x4000 > Temp Heap : BaseAddress=3D0x810000 Length=3D0x4000 > Total temporary memory: 32768 bytes. > temporary memory stack ever used: 5048 bytes. <---- > temporary memory heap used for HobList: 7112 bytes. > temporary memory heap occupied by memory pages: 0 bytes. I unit-tested this change by transitorily adding an infinite loop right after the "rep stosq", and dumping the guest's temp SEC/PEI RAM (32KB currently) while the guest was stuck in the loop. The dump includes one dword from before and after the temp SEC/PEI RAM: > $ virsh qemu-monitor-command GUEST_NAME --hmp 'xp /8194wx 0x80FFFC' > > 000000000080fffc: 0x00000000 0x5aa55aa5 0x5aa55aa5 0x5aa55aa5 > 000000000081000c: 0x5aa55aa5 0x5aa55aa5 0x5aa55aa5 0x5aa55aa5 > ... > 0000000000817fec: 0x5aa55aa5 0x5aa55aa5 0x5aa55aa5 0x5aa55aa5 > 0000000000817ffc: 0x5aa55aa5 0x00000000 Cc: Ard Biesheuvel Cc: Jordan Justen Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3D747 Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Laszlo Ersek Reviewed-by: Ard Biesheuvel --- Notes: v2: - update comment on ES [Jordan] - document the other segment registers too [Jordan] - move seeding to top of routine, for consistency with the IA32 version - replace runtime right shift with compile-time division [Jordan] - compose qword-to-write at compile-time, not at runtime - drop Ard's Reviewed-by OvmfPkg/Sec/X64/SecEntry.nasm | 21 ++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/OvmfPkg/Sec/X64/SecEntry.nasm b/OvmfPkg/Sec/X64/SecEntry.nasm index f40427aa8e04..7c55032ac962 100644 --- a/OvmfPkg/Sec/X64/SecEntry.nasm +++ b/OvmfPkg/Sec/X64/SecEntry.nasm @@ -30,12 +30,33 @@ extern ASM_PFX(SecCoreStartupWithStack) ; @param[in] RAX Initial value of the EAX register (BIST: Built-in Self= Test) ; @param[in] DI 'BP': boot-strap processor, or 'AP': application proce= ssor ; @param[in] RBP Pointer to the start of the Boot Firmware Volume +; @param[in] DS Selector allowing flat access to all addresses +; @param[in] ES Selector allowing flat access to all addresses +; @param[in] FS Selector allowing flat access to all addresses +; @param[in] GS Selector allowing flat access to all addresses +; @param[in] SS Selector allowing flat access to all addresses ; ; @return None This routine does not return ; global ASM_PFX(_ModuleEntryPoint) ASM_PFX(_ModuleEntryPoint): =20 + ; + ; Fill the temporary RAM with the initial stack value. + ; The loop below will seed the heap as well, but that's harmless. + ; + mov rax, (FixedPcdGet32 ( \ + PcdInitValueInTempStack \ + ) << 32) | \ + FixedPcdGet32 (PcdInitValueInTempStack) ; qword to s= tore + mov rdi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) ; base addre= ss, + ; relative= to + ; ES + mov rcx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 8 ; qword count + cld ; store from= base + ; up + rep stosq + ; ; Load temporary RAM stack based on PCDs ; --=20 2.14.1.3.gb7cf6e02401b _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel