From patchwork Wed Jan 20 22:44:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 1429472 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4DLgjG1sbfz9sT6 for ; Thu, 21 Jan 2021 09:50:42 +1100 (AEDT) Received: from localhost ([::1]:48804 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l2MJE-0001b4-7V for incoming@patchwork.ozlabs.org; Wed, 20 Jan 2021 17:50:40 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:56580) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l2MDf-0003sm-Nr; Wed, 20 Jan 2021 17:44:56 -0500 Received: from mail.csgraf.de ([188.138.100.120]:45200 helo=zulu616.server4you.de) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l2MDd-0001V5-MB; Wed, 20 Jan 2021 17:44:55 -0500 Received: from localhost.localdomain (dynamic-077-002-091-253.77.2.pool.telefonica.de [77.2.91.253]) by csgraf.de (Postfix) with ESMTPSA id BCA273900565; Wed, 20 Jan 2021 23:44:49 +0100 (CET) From: Alexander Graf To: qemu-devel@nongnu.org Subject: [PATCH v6 06/11] hvf: Simplify post reset/init/loadvm hooks Date: Wed, 20 Jan 2021 23:44:39 +0100 Message-Id: <20210120224444.71840-7-agraf@csgraf.de> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20210120224444.71840-1-agraf@csgraf.de> References: <20210120224444.71840-1-agraf@csgraf.de> MIME-Version: 1.0 Received-SPF: pass client-ip=188.138.100.120; envelope-from=agraf@csgraf.de; helo=zulu616.server4you.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Eduardo Habkost , Richard Henderson , Cameron Esfahani , Roman Bolshakov , qemu-arm@nongnu.org, Frank Yang , Paolo Bonzini , Peter Collingbourne Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The hooks we have that call us after reset, init and loadvm really all just want to say "The reference of all register state is in the QEMU vcpu struct, please push it". We already have a working pushing mechanism though called cpu->vcpu_dirty, so we can just reuse that for all of the above, syncing state properly the next time we actually execute a vCPU. This fixes PSCI resets on ARM, as they modify CPU state even after the post init call has completed, but before we execute the vCPU again. To also make the scheme work for x86, we have to make sure we don't move stale eflags into our env when the vcpu state is dirty. Signed-off-by: Alexander Graf Reviewed-by: Roman Bolshakov Tested-by: Roman Bolshakov --- accel/hvf/hvf-cpus.c | 27 +++++++-------------------- target/i386/hvf/x86hvf.c | 5 ++++- 2 files changed, 11 insertions(+), 21 deletions(-) diff --git a/accel/hvf/hvf-cpus.c b/accel/hvf/hvf-cpus.c index 2c6796604a..a324da2757 100644 --- a/accel/hvf/hvf-cpus.c +++ b/accel/hvf/hvf-cpus.c @@ -275,39 +275,26 @@ static void hvf_cpu_synchronize_state(CPUState *cpu) } } -static void do_hvf_cpu_synchronize_post_reset(CPUState *cpu, - run_on_cpu_data arg) +static void do_hvf_cpu_synchronize_set_dirty(CPUState *cpu, + run_on_cpu_data arg) { - hvf_put_registers(cpu); - cpu->vcpu_dirty = false; + /* QEMU state is the reference, push it to HVF now and on next entry */ + cpu->vcpu_dirty = true; } static void hvf_cpu_synchronize_post_reset(CPUState *cpu) { - run_on_cpu(cpu, do_hvf_cpu_synchronize_post_reset, RUN_ON_CPU_NULL); -} - -static void do_hvf_cpu_synchronize_post_init(CPUState *cpu, - run_on_cpu_data arg) -{ - hvf_put_registers(cpu); - cpu->vcpu_dirty = false; + run_on_cpu(cpu, do_hvf_cpu_synchronize_set_dirty, RUN_ON_CPU_NULL); } static void hvf_cpu_synchronize_post_init(CPUState *cpu) { - run_on_cpu(cpu, do_hvf_cpu_synchronize_post_init, RUN_ON_CPU_NULL); -} - -static void do_hvf_cpu_synchronize_pre_loadvm(CPUState *cpu, - run_on_cpu_data arg) -{ - cpu->vcpu_dirty = true; + run_on_cpu(cpu, do_hvf_cpu_synchronize_set_dirty, RUN_ON_CPU_NULL); } static void hvf_cpu_synchronize_pre_loadvm(CPUState *cpu) { - run_on_cpu(cpu, do_hvf_cpu_synchronize_pre_loadvm, RUN_ON_CPU_NULL); + run_on_cpu(cpu, do_hvf_cpu_synchronize_set_dirty, RUN_ON_CPU_NULL); } static void hvf_vcpu_destroy(CPUState *cpu) diff --git a/target/i386/hvf/x86hvf.c b/target/i386/hvf/x86hvf.c index 0f2aeb1cf8..3111c0be4c 100644 --- a/target/i386/hvf/x86hvf.c +++ b/target/i386/hvf/x86hvf.c @@ -435,7 +435,10 @@ int hvf_process_events(CPUState *cpu_state) X86CPU *cpu = X86_CPU(cpu_state); CPUX86State *env = &cpu->env; - env->eflags = rreg(cpu_state->hvf->fd, HV_X86_RFLAGS); + if (!cpu_state->vcpu_dirty) { + /* light weight sync for CPU_INTERRUPT_HARD and IF_MASK */ + env->eflags = rreg(cpu_state->hvf->fd, HV_X86_RFLAGS); + } if (cpu_state->interrupt_request & CPU_INTERRUPT_INIT) { cpu_synchronize_state(cpu_state);