From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6D989CA9EAB for ; Fri, 18 Oct 2019 16:11:33 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 3ED1721D7C for ; Fri, 18 Oct 2019 16:11:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="fQxG2Z0W"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="gMmfpLUm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3ED1721D7C Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:To:From:Subject:References:Mime-Version :Message-Id:In-Reply-To:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=luCzNxDO82sWMFEn0Gs+MBJbhsDGsvd8vNrsp7AsHf4=; b=fQxG2Z0W9ZPUb8 Vgr9VTEyGiSYq2S7lSnH7UNxfvyocPqo7caokYMGPi5n7DRa6jpQt10gEepG3RreLFzp1Wb1KQcH6 sH7kA8lB1BSbt/w2aE+4HzKkicLCWfBAg3BNxL+H7z3PMt7PodQuCVdYvj2rUy96TLeksgdjuF9IZ HgHEBLM/w40Dejq2gtA2t3N0bnsKdEhS9JXTyfiwUiywj/xeURkOrK0IBFFtTO6ry/ILEqLbnITjf ANLXOk7pEXiMGcTsN1tgNOnK66qlGygqa1ip67514AA9VH+Ebsuy5kQ7UK0UqPp6lmxnJkPRffUAh oE2RV+zL+gcsO/8Zz5UQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iLUqX-0001xV-SN; Fri, 18 Oct 2019 16:11:21 +0000 Received: from mail-pl1-x649.google.com ([2607:f8b0:4864:20::649]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iLUq1-0001TB-C9 for linux-arm-kernel@lists.infradead.org; Fri, 18 Oct 2019 16:10:50 +0000 Received: by mail-pl1-x649.google.com with SMTP id 99so4015047plc.18 for ; Fri, 18 Oct 2019 09:10:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=fOGiRQkTcafFw3kdPLJfkScWMPKQ55OPiVpVgBq1L2Y=; b=gMmfpLUmWSms+DWxdPHIfAD6vs9RBHnPXI+iTSb/gCG+R7cNXs2b5uBPJCYTEo7izz /Raf56KKS95suuvqh1yzOQjpOZYsH/4vRvMlKN0ZIyyBfnU2AeT4YoERdtJm3yrC4+vY 0OxEL7940UbAaXzNMVID1dP6HRdAhIQ6wFjNYG57zbpFHwZ0WwfTPVCFFZhJpOF/t3A9 9CLRQ0xV3QFyyGRY1rJZV9hFziEOlin2nV27aZ33hx/xGULb4Cz9V3pJJJy/KJcOVnua JRuCV/9ChbbioD0f/pMbO9vPUsu8raQ2egyKkU/VBLQwhJoGxgstGPYnuLnJSbGzElKZ XzGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=fOGiRQkTcafFw3kdPLJfkScWMPKQ55OPiVpVgBq1L2Y=; b=XkgsXViKQeZsY+lxmDKhmewHS4m3TuI0xjjoGBWtjXAoDDiffzN8GlOQFsy0xZ6Utz HUKbpTFyRxtjYs8meH4TJDk7BmLZ5iHySgUjjuB8zcUBYO22waWpsfWnvfryjl1wUkSr ZSmeCRc6PV22X+MJrD0qqknna29QZuutvZ8O0HOEB0q0hrvr56dYm+EyDXxbrd7BrzGZ 1IjUdJeX4+wK46bNW/H/EE6UUMhyB/YVGdkb0GhAXf9aynkeZTraIE9mzjKE4DpNR1ue LRys8hS2mhUZb9AhC9uq9l8+a+EeBth0gSLno51nyEbvcK3Kd3wnu8gBhAsM7FfQTKE/ 9C3g== X-Gm-Message-State: APjAAAWg0nweXBhDsyJmUdTRpII65XLrvoT0gd1NNjK/HlM/7Rb3MWN2 TP+vCz9OIY3AxCax0GJ0OP3XSGH41YdIstRbwTE= X-Google-Smtp-Source: APXvYqxdcdFBRFb0HNyGzQvnCMLB0keAhMf4yh0jcUv/6ytScnNhV6MYVkz//a3X1pTXSJd9ILJJXg39d/ovVZN0Qvw= X-Received: by 2002:a63:3c5a:: with SMTP id i26mr10727727pgn.207.1571415047168; Fri, 18 Oct 2019 09:10:47 -0700 (PDT) Date: Fri, 18 Oct 2019 09:10:16 -0700 In-Reply-To: <20191018161033.261971-1-samitolvanen@google.com> Message-Id: <20191018161033.261971-2-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> X-Mailer: git-send-email 2.23.0.866.gb869b98d4c-goog Subject: [PATCH 01/18] arm64: mm: don't use x18 in idmap_kpti_install_ng_mappings From: Sami Tolvanen To: Will Deacon , Catalin Marinas , Steven Rostedt , Ard Biesheuvel X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191018_091049_441622_9933EBF0 X-CRM114-Status: GOOD ( 10.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Kees Cook , kernel-hardening@lists.openwall.com, Nick Desaulniers , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Sami Tolvanen , Laura Abbott , Dave Martin , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org idmap_kpti_install_ng_mappings uses x18 as a temporary register, which will result in a conflict when x18 is reserved. Use x16 and x17 instead where needed. Signed-off-by: Sami Tolvanen --- arch/arm64/mm/proc.S | 63 ++++++++++++++++++++++---------------------- 1 file changed, 32 insertions(+), 31 deletions(-) diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index a1e0592d1fbc..fdabf40a83c8 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -250,15 +250,15 @@ ENTRY(idmap_kpti_install_ng_mappings) /* We're the boot CPU. Wait for the others to catch up */ sevl 1: wfe - ldaxr w18, [flag_ptr] - eor w18, w18, num_cpus - cbnz w18, 1b + ldaxr w17, [flag_ptr] + eor w17, w17, num_cpus + cbnz w17, 1b /* We need to walk swapper, so turn off the MMU. */ pre_disable_mmu_workaround - mrs x18, sctlr_el1 - bic x18, x18, #SCTLR_ELx_M - msr sctlr_el1, x18 + mrs x17, sctlr_el1 + bic x17, x17, #SCTLR_ELx_M + msr sctlr_el1, x17 isb /* Everybody is enjoying the idmap, so we can rewrite swapper. */ @@ -281,9 +281,9 @@ skip_pgd: isb /* We're done: fire up the MMU again */ - mrs x18, sctlr_el1 - orr x18, x18, #SCTLR_ELx_M - msr sctlr_el1, x18 + mrs x17, sctlr_el1 + orr x17, x17, #SCTLR_ELx_M + msr sctlr_el1, x17 isb /* @@ -353,46 +353,47 @@ skip_pte: b.ne do_pte b next_pmd + .unreq cpu + .unreq num_cpus + .unreq swapper_pa + .unreq cur_pgdp + .unreq end_pgdp + .unreq pgd + .unreq cur_pudp + .unreq end_pudp + .unreq pud + .unreq cur_pmdp + .unreq end_pmdp + .unreq pmd + .unreq cur_ptep + .unreq end_ptep + .unreq pte + /* Secondary CPUs end up here */ __idmap_kpti_secondary: /* Uninstall swapper before surgery begins */ - __idmap_cpu_set_reserved_ttbr1 x18, x17 + __idmap_cpu_set_reserved_ttbr1 x16, x17 /* Increment the flag to let the boot CPU we're ready */ -1: ldxr w18, [flag_ptr] - add w18, w18, #1 - stxr w17, w18, [flag_ptr] +1: ldxr w16, [flag_ptr] + add w16, w16, #1 + stxr w17, w16, [flag_ptr] cbnz w17, 1b /* Wait for the boot CPU to finish messing around with swapper */ sevl 1: wfe - ldxr w18, [flag_ptr] - cbnz w18, 1b + ldxr w16, [flag_ptr] + cbnz w16, 1b /* All done, act like nothing happened */ - offset_ttbr1 swapper_ttb, x18 + offset_ttbr1 swapper_ttb, x16 msr ttbr1_el1, swapper_ttb isb ret - .unreq cpu - .unreq num_cpus - .unreq swapper_pa .unreq swapper_ttb .unreq flag_ptr - .unreq cur_pgdp - .unreq end_pgdp - .unreq pgd - .unreq cur_pudp - .unreq end_pudp - .unreq pud - .unreq cur_pmdp - .unreq end_pmdp - .unreq pmd - .unreq cur_ptep - .unreq end_ptep - .unreq pte ENDPROC(idmap_kpti_install_ng_mappings) .popsection #endif -- 2.23.0.866.gb869b98d4c-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel