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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 75E2CC83018 for ; Wed, 2 Dec 2020 18:43:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2AA6E206D5 for ; Wed, 2 Dec 2020 18:43:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389551AbgLBSnZ (ORCPT ); Wed, 2 Dec 2020 13:43:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53948 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389542AbgLBSnX (ORCPT ); Wed, 2 Dec 2020 13:43:23 -0500 Received: from mail-wr1-x444.google.com (mail-wr1-x444.google.com [IPv6:2a00:1450:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6E6CC09424B for ; Wed, 2 Dec 2020 10:42:13 -0800 (PST) Received: by mail-wr1-x444.google.com with SMTP id u12so5195227wrt.0 for ; Wed, 02 Dec 2020 10:42:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=yTPqxuNIHyHcxIGVDRFuzMb//a26J9RNoM2ThcyKbSM=; b=aCv+2fOzVacnmojuOT7cqdovfGr22fjEzJv+MRvW19pxd/At/2+SeBvsnBovv23E0a 4ejG9x3wrILwl7LMVEeZNAy3Oz04NMiHm2Fj4hdnEr9LAkH0YCPP1X0lywRi3nVmOGD7 nkwvoIwyzCN0kTWt4W3zAUBl+ihGtvBa9iAj7T1vlVaWad8lbsjZhFTC3rh2nTTEeoVN /Lvdr5l6vK5yD3B1B66RYBHWXz9OiYZYIBnuFg7gVGUh0Sw1Q8cGh4Im1B7YS4gfugr6 oyO6bJiThSBLLb5BdbTjsa1DmmAbRvnlt4Ys1b6GgaoLrc+4THiITVFGUu94qhXAsFdT AhxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=yTPqxuNIHyHcxIGVDRFuzMb//a26J9RNoM2ThcyKbSM=; b=gTiBTWyikyeY05UrIKeZQKjwf6luAyJY1fckHfC9i+pz+P3oOo5GtCEMtmvqu6kZap 4VqiMbLxhtfP6qo0C4ZAOonCz5p5fdoC9+K1Q4YFNk2Z++PvrUcsYk0mARJaZ8bUVsnx 8HHifWZygrgknCuQ+SBRMD7KCZxjFvzfGaiWH7bJt/iMEbb4gczXe5huk73GgFRnZdM6 10b92ZUemY/6yuvE5auto+cTa3/b7B3yn8CiKNtoaWi5Rc52w+r2phFLq3TRjR+VLxhl r/MsvOP5iZN7COCZ5f8oWAIApLhs0/7gz8IQ8EwM0S415xLtBaanxeBgt4eU9P+bKnBh GmOQ== X-Gm-Message-State: AOAM530i9awFAhtD9mwstQNUm9p7V1FHhuRszzlwBY7eXrqYQfe9+9C6 eGhCi/A8yZUKSrNm09GaD9MZCg== X-Google-Smtp-Source: ABdhPJylrxzOOF0czEtZ7fv5Klvs9l0NUYOehr4kbC+Jl1sFVyJ7nzp854Drk3FK4NwPazSOzLk5iA== X-Received: by 2002:a5d:504f:: with SMTP id h15mr5035439wrt.402.1606934532259; Wed, 02 Dec 2020 10:42:12 -0800 (PST) Received: from localhost ([2a01:4b00:8523:2d03:5ddd:b7c5:e3c9:e87a]) by smtp.gmail.com with ESMTPSA id b200sm3008640wmb.10.2020.12.02.10.42.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Dec 2020 10:42:11 -0800 (PST) From: David Brazdil To: kvmarm@lists.cs.columbia.edu Cc: Jonathan Corbet , Catalin Marinas , Will Deacon , Marc Zyngier , James Morse , Julien Thierry , Suzuki K Poulose , Dennis Zhou , Tejun Heo , Christoph Lameter , Mark Rutland , Lorenzo Pieralisi , Sudeep Holla , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel-team@android.com, David Brazdil Subject: [PATCH v4 20/26] kvm: arm64: Add function to enter host from KVM nVHE hyp code Date: Wed, 2 Dec 2020 18:41:16 +0000 Message-Id: <20201202184122.26046-21-dbrazdil@google.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201202184122.26046-1-dbrazdil@google.com> References: <20201202184122.26046-1-dbrazdil@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org All nVHE hyp code is currently executed as handlers of host's HVCs. This will change as nVHE starts intercepting host's PSCI CPU_ON SMCs. The newly booted CPU will need to initialize EL2 state and then enter the host. Add __host_enter function that branches into the existing host state-restoring code after the trap handler would have returned. Signed-off-by: David Brazdil --- arch/arm64/kvm/hyp/nvhe/host.S | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S index 2b56f0bdf874..a820dfdc9c25 100644 --- a/arch/arm64/kvm/hyp/nvhe/host.S +++ b/arch/arm64/kvm/hyp/nvhe/host.S @@ -39,6 +39,7 @@ SYM_FUNC_START(__host_exit) bl handle_trap /* Restore host regs x0-x17 */ +__host_enter_restore_full: ldp x0, x1, [x29, #CPU_XREG_OFFSET(0)] ldp x2, x3, [x29, #CPU_XREG_OFFSET(2)] ldp x4, x5, [x29, #CPU_XREG_OFFSET(4)] @@ -61,6 +62,14 @@ __host_enter_without_restoring: sb SYM_FUNC_END(__host_exit) +/* + * void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt); + */ +SYM_FUNC_START(__host_enter) + mov x29, x0 + b __host_enter_restore_full +SYM_FUNC_END(__host_enter) + /* * void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par); */ -- 2.29.2.454.gaff20da3a2-goog 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=-16.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 08202C64E7C for ; Wed, 2 Dec 2020 18:42:21 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 7D6C3206D5 for ; Wed, 2 Dec 2020 18:42:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7D6C3206D5 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 152F24B3FE; Wed, 2 Dec 2020 13:42:18 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TWaLTB9f2Rt7; Wed, 2 Dec 2020 13:42:17 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 1F8894B406; Wed, 2 Dec 2020 13:42:17 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 930244B3CE for ; Wed, 2 Dec 2020 13:42:15 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6CyMFgxlpn6W for ; Wed, 2 Dec 2020 13:42:14 -0500 (EST) Received: from mail-wr1-f66.google.com (mail-wr1-f66.google.com [209.85.221.66]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 89C074B420 for ; Wed, 2 Dec 2020 13:42:13 -0500 (EST) Received: by mail-wr1-f66.google.com with SMTP id p8so5163410wrx.5 for ; Wed, 02 Dec 2020 10:42:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=yTPqxuNIHyHcxIGVDRFuzMb//a26J9RNoM2ThcyKbSM=; b=aCv+2fOzVacnmojuOT7cqdovfGr22fjEzJv+MRvW19pxd/At/2+SeBvsnBovv23E0a 4ejG9x3wrILwl7LMVEeZNAy3Oz04NMiHm2Fj4hdnEr9LAkH0YCPP1X0lywRi3nVmOGD7 nkwvoIwyzCN0kTWt4W3zAUBl+ihGtvBa9iAj7T1vlVaWad8lbsjZhFTC3rh2nTTEeoVN /Lvdr5l6vK5yD3B1B66RYBHWXz9OiYZYIBnuFg7gVGUh0Sw1Q8cGh4Im1B7YS4gfugr6 oyO6bJiThSBLLb5BdbTjsa1DmmAbRvnlt4Ys1b6GgaoLrc+4THiITVFGUu94qhXAsFdT AhxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=yTPqxuNIHyHcxIGVDRFuzMb//a26J9RNoM2ThcyKbSM=; b=nEOjYbQAFNKbthw/C9FUkcAGwxQAiM5wuf9lNRpasrAf3xLfVYDw/qrAldvLmpXrX6 4fvoFDok169FAvs8qAs8BBl3lxIR1J5/OgFk3kfYoSkH0Saq40i4WNndLT1kU6gJ3tcx mSqrFgYvHR0IhP/2N1DVb4rLtMkuKw6y+bg/oTDx75Hv1Z4o2YXjQ48LGD40dzGPyu5k pxd3eAcjKQgGvMODjc1MSAmxJdiWlHNrE1bOFvbAr6FZFydnfAgoDNXp+/Qw++TyMc3J +KxfYn1X+1T4KtXz29NqCkJ1XOk4XGdxE2fFC6TQlzYbt8hZHr1uov+T9Y4LqImtwWNL 4qLQ== X-Gm-Message-State: AOAM532wJvnmNCN0ZBcpIDj9qybCkTupPj6/4qtHYLwQierqa4bPJ8td 4GvTZkt5bdKmiCV5Smr+Xaa4XhzF9Q3aZA== X-Google-Smtp-Source: ABdhPJylrxzOOF0czEtZ7fv5Klvs9l0NUYOehr4kbC+Jl1sFVyJ7nzp854Drk3FK4NwPazSOzLk5iA== X-Received: by 2002:a5d:504f:: with SMTP id h15mr5035439wrt.402.1606934532259; Wed, 02 Dec 2020 10:42:12 -0800 (PST) Received: from localhost ([2a01:4b00:8523:2d03:5ddd:b7c5:e3c9:e87a]) by smtp.gmail.com with ESMTPSA id b200sm3008640wmb.10.2020.12.02.10.42.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Dec 2020 10:42:11 -0800 (PST) From: David Brazdil To: kvmarm@lists.cs.columbia.edu Subject: [PATCH v4 20/26] kvm: arm64: Add function to enter host from KVM nVHE hyp code Date: Wed, 2 Dec 2020 18:41:16 +0000 Message-Id: <20201202184122.26046-21-dbrazdil@google.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201202184122.26046-1-dbrazdil@google.com> References: <20201202184122.26046-1-dbrazdil@google.com> MIME-Version: 1.0 Cc: Lorenzo Pieralisi , kernel-team@android.com, Jonathan Corbet , Catalin Marinas , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Sudeep Holla , linux-arm-kernel@lists.infradead.org, Marc Zyngier , Tejun Heo , Dennis Zhou , Christoph Lameter , Will Deacon X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu All nVHE hyp code is currently executed as handlers of host's HVCs. This will change as nVHE starts intercepting host's PSCI CPU_ON SMCs. The newly booted CPU will need to initialize EL2 state and then enter the host. Add __host_enter function that branches into the existing host state-restoring code after the trap handler would have returned. Signed-off-by: David Brazdil --- arch/arm64/kvm/hyp/nvhe/host.S | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S index 2b56f0bdf874..a820dfdc9c25 100644 --- a/arch/arm64/kvm/hyp/nvhe/host.S +++ b/arch/arm64/kvm/hyp/nvhe/host.S @@ -39,6 +39,7 @@ SYM_FUNC_START(__host_exit) bl handle_trap /* Restore host regs x0-x17 */ +__host_enter_restore_full: ldp x0, x1, [x29, #CPU_XREG_OFFSET(0)] ldp x2, x3, [x29, #CPU_XREG_OFFSET(2)] ldp x4, x5, [x29, #CPU_XREG_OFFSET(4)] @@ -61,6 +62,14 @@ __host_enter_without_restoring: sb SYM_FUNC_END(__host_exit) +/* + * void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt); + */ +SYM_FUNC_START(__host_enter) + mov x29, x0 + b __host_enter_restore_full +SYM_FUNC_END(__host_enter) + /* * void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par); */ -- 2.29.2.454.gaff20da3a2-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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=-18.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 5F648C71155 for ; Wed, 2 Dec 2020 18:47:35 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 D119721741 for ; Wed, 2 Dec 2020 18:47:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D119721741 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+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=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Zxj8I5wY/RHZ9H+PfDqMSs2OXtw1VOksdniY2dfs2qY=; b=PSaA8pmuGXfcNNwwDWBqzki7B 5Gt4ZqhbP+84sA7fl0x861Sc9iBvR26R1W3y8dpi17rFtvwgyR7hkfBFZROy62PUjGgXE2NaM7XUG zDJ8vvA817cYdWrdhstJNNscwe9XJtafa1L3sFKGh9GIcTRdP75Udxo1Zs5v3+bE+9NhlqnZPhpcq z0zF0xBw8GQFOoaGYvDKgQI4JJE/6vPpb25euhD4OWQ2gtv7TCJkLUtp0ZQJUplBnE+OqsWpYUTJq M/uxrpkBtALfDwyy9D0zqKLIl5jgt1Zh0rLAYxfmlVdnR+b7syER7+tihrrAQbMGYUEMt2+6ZPIqB olJylEDhA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kkX87-0001vt-N9; Wed, 02 Dec 2020 18:45:31 +0000 Received: from mail-wr1-x441.google.com ([2a00:1450:4864:20::441]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kkX4v-0008PT-Bz for linux-arm-kernel@lists.infradead.org; Wed, 02 Dec 2020 18:42:15 +0000 Received: by mail-wr1-x441.google.com with SMTP id o1so5163726wrx.7 for ; Wed, 02 Dec 2020 10:42:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=yTPqxuNIHyHcxIGVDRFuzMb//a26J9RNoM2ThcyKbSM=; b=aCv+2fOzVacnmojuOT7cqdovfGr22fjEzJv+MRvW19pxd/At/2+SeBvsnBovv23E0a 4ejG9x3wrILwl7LMVEeZNAy3Oz04NMiHm2Fj4hdnEr9LAkH0YCPP1X0lywRi3nVmOGD7 nkwvoIwyzCN0kTWt4W3zAUBl+ihGtvBa9iAj7T1vlVaWad8lbsjZhFTC3rh2nTTEeoVN /Lvdr5l6vK5yD3B1B66RYBHWXz9OiYZYIBnuFg7gVGUh0Sw1Q8cGh4Im1B7YS4gfugr6 oyO6bJiThSBLLb5BdbTjsa1DmmAbRvnlt4Ys1b6GgaoLrc+4THiITVFGUu94qhXAsFdT AhxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=yTPqxuNIHyHcxIGVDRFuzMb//a26J9RNoM2ThcyKbSM=; b=mSnCJC1kIMaoUaX/c6lnGCwi+L72IuiS7YFF18siy4zJLIO6mBuaNx8jqFov0uZZ7t c0b1vHsjLmhLRwCxUqla2qUnw3bO8/r0JrYaiF4j2cUDHC6DvZih3osJkVP1R4d/qWsr sGz97x+Ust3ITIiFzQEmVxHDNQ1bFvTN8ncNosUFJVMrC/8tPDj2tAfaU57D8uXtHOXx E54K9pr3p1+VbnMWTb+1HprgojJq2VFgGP9fqAodM37XlxskL17HpvC1d1FZHx/Qn1V4 KeoXjQbkPBtjEjLVWEcxtFby+ztxYDv+CEzU54BFDZsKYDDimkXhTzX6oYqIvgXqXcvE 8Piw== X-Gm-Message-State: AOAM533wWvacN7mCkPgYQ0ckde4c6DnrceI1DhdZw1bzC0fNjOxtx+ou ID5TfIa9o+JOYMXlnUVijW575A== X-Google-Smtp-Source: ABdhPJylrxzOOF0czEtZ7fv5Klvs9l0NUYOehr4kbC+Jl1sFVyJ7nzp854Drk3FK4NwPazSOzLk5iA== X-Received: by 2002:a5d:504f:: with SMTP id h15mr5035439wrt.402.1606934532259; Wed, 02 Dec 2020 10:42:12 -0800 (PST) Received: from localhost ([2a01:4b00:8523:2d03:5ddd:b7c5:e3c9:e87a]) by smtp.gmail.com with ESMTPSA id b200sm3008640wmb.10.2020.12.02.10.42.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Dec 2020 10:42:11 -0800 (PST) From: David Brazdil To: kvmarm@lists.cs.columbia.edu Subject: [PATCH v4 20/26] kvm: arm64: Add function to enter host from KVM nVHE hyp code Date: Wed, 2 Dec 2020 18:41:16 +0000 Message-Id: <20201202184122.26046-21-dbrazdil@google.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201202184122.26046-1-dbrazdil@google.com> References: <20201202184122.26046-1-dbrazdil@google.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201202_134213_496603_2EC6BADA X-CRM114-Status: GOOD ( 14.35 ) 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 , Lorenzo Pieralisi , kernel-team@android.com, Jonathan Corbet , Catalin Marinas , Suzuki K Poulose , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Sudeep Holla , James Morse , linux-arm-kernel@lists.infradead.org, Marc Zyngier , Tejun Heo , Dennis Zhou , Christoph Lameter , David Brazdil , Will Deacon , Julien Thierry Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org All nVHE hyp code is currently executed as handlers of host's HVCs. This will change as nVHE starts intercepting host's PSCI CPU_ON SMCs. The newly booted CPU will need to initialize EL2 state and then enter the host. Add __host_enter function that branches into the existing host state-restoring code after the trap handler would have returned. Signed-off-by: David Brazdil --- arch/arm64/kvm/hyp/nvhe/host.S | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S index 2b56f0bdf874..a820dfdc9c25 100644 --- a/arch/arm64/kvm/hyp/nvhe/host.S +++ b/arch/arm64/kvm/hyp/nvhe/host.S @@ -39,6 +39,7 @@ SYM_FUNC_START(__host_exit) bl handle_trap /* Restore host regs x0-x17 */ +__host_enter_restore_full: ldp x0, x1, [x29, #CPU_XREG_OFFSET(0)] ldp x2, x3, [x29, #CPU_XREG_OFFSET(2)] ldp x4, x5, [x29, #CPU_XREG_OFFSET(4)] @@ -61,6 +62,14 @@ __host_enter_without_restoring: sb SYM_FUNC_END(__host_exit) +/* + * void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt); + */ +SYM_FUNC_START(__host_enter) + mov x29, x0 + b __host_enter_restore_full +SYM_FUNC_END(__host_enter) + /* * void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par); */ -- 2.29.2.454.gaff20da3a2-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel