From patchwork Wed Oct 25 07:07:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chao Du X-Patchwork-Id: 13435751 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 2F55BC25B47 for ; Wed, 25 Oct 2023 09:11:27 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qvZtQ-0005xw-LC; Wed, 25 Oct 2023 05:09:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qvXzj-0003ac-9e; Wed, 25 Oct 2023 03:07:59 -0400 Received: from zg8tmtu5ljg5lje1ms4xmtka.icoremail.net ([159.89.151.119]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qvXzg-0000y8-0B; Wed, 25 Oct 2023 03:07:59 -0400 Received: from localhost.localdomain (unknown [10.12.130.31]) by app1 (Coremail) with SMTP id TAJkCgAHbkW9vjhlKukAAA--.2473S4; Wed, 25 Oct 2023 15:07:41 +0800 (CST) From: Chao Du To: qemu-devel@nongnu.org, qemu-arm@nongnu.org Subject: [PATCH] target/arm: kvm64: remove a redundant KVM_CAP_SET_GUEST_DEBUG probe Date: Wed, 25 Oct 2023 07:07:26 +0000 Message-Id: <20231025070726.22689-1-duchao@eswincomputing.com> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID: TAJkCgAHbkW9vjhlKukAAA--.2473S4 X-Coremail-Antispam: 1UD129KBjvJXoWxJr4DKw1DAw4fur4Uur17ZFb_yoW8tr1fp3 Z3Crs3Jr4ktasxJw1xArsrZr13JrWkKwnFy34FvryrGasxKw15AFWvkrZ5CFyrurWI9r15 tF4vyF4Sva1kXr7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvS14x267AKxVWUJVW8JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26F1j6w1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4U JVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lc7CjxVAKzI0EY4vE 52x082I5MxkIecxEwVCm-wCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8Jw C20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAF wI0_Jrv_JF1lIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjx v20xvEc7CjxVAFwI0_Jr0_Gr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2 jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Jr0_GrUvcSsGvfC2KfnxnUUI43 ZEXa7VUU6RRtUUUUU== X-CM-SenderInfo: xgxfxt3r6h245lqf0zpsxwx03jof0z/ Received-SPF: pass client-ip=159.89.151.119; envelope-from=duchao@eswincomputing.com; helo=zg8tmtu5ljg5lje1ms4xmtka.icoremail.net 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, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Wed, 25 Oct 2023 05:09:34 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org The KVM_CAP_SET_GUEST_DEBUG is probed during kvm_init(). gdbserver will fail to start if the CAP is not supported. So no need to make another probe here, like other targets. Signed-off-by: Chao Du Reviewed-by: Richard Henderson --- target/arm/kvm64.c | 28 +++++++--------------------- 1 file changed, 7 insertions(+), 21 deletions(-) diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index 4bb68646e4..b0bf59b5a1 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -31,13 +31,9 @@ #include "hw/acpi/acpi.h" #include "hw/acpi/ghes.h" -static bool have_guest_debug; void kvm_arm_init_debug(KVMState *s) { - have_guest_debug = kvm_check_extension(s, - KVM_CAP_SET_GUEST_DEBUG); - max_hw_wps = kvm_check_extension(s, KVM_CAP_GUEST_DEBUG_HW_WPS); hw_watchpoints = g_array_sized_new(true, true, sizeof(HWWatchpoint), max_hw_wps); @@ -1140,33 +1136,23 @@ static const uint32_t brk_insn = 0xd4200000; int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp) { - if (have_guest_debug) { - if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) || - cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&brk_insn, 4, 1)) { - return -EINVAL; - } - return 0; - } else { - error_report("guest debug not supported on this kernel"); + if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) || + cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&brk_insn, 4, 1)) { return -EINVAL; } + return 0; } int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp) { static uint32_t brk; - if (have_guest_debug) { - if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&brk, 4, 0) || - brk != brk_insn || - cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 1)) { - return -EINVAL; - } - return 0; - } else { - error_report("guest debug not supported on this kernel"); + if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&brk, 4, 0) || + brk != brk_insn || + cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 1)) { return -EINVAL; } + return 0; } /* See v8 ARM ARM D7.2.27 ESR_ELx, Exception Syndrome Register