From nobody Thu Nov 13 20:39:58 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=intel.com ARC-Seal: i=1; a=rsa-sha256; t=1582551674; cv=none; d=zohomail.com; s=zohoarc; b=JLQSDKhtPwzVO+dnczYgcyU61sGSwJfgqpEOxM8ALMHgPj/gHeSwLm++rCJhOv+Y79iqIezt5x+AuE4fmwT9FPzC//C8sCXBiU+vvl2D/FueF7CGKTTzP8n3vtZiZ/5t0N/R9F2RoAlBK1krN4MkA8SKtAmFquTzuMveaRvfJdA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1582551674; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=MkiBhNGTrr8ZVq5JuWIfvMMWgcKDj++XML5q+IfFZas=; b=Od4a0ZcOaWAXPQviN++MWrAhywjDFuJUdXgEEBndXl4mPJlxbaAUJSAum5IYoiB1aaHhTMjnGzNkUFKJBwxf4lz/DvF+yMSNE/JJJpoAMKoKDy6gxUU1+Foa+GN3cu9M0iCCI/xcKwSee3SRMNIWLT8Pqe8Q3VuWmartIErCRwc= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1582551673930229.57026138376875; Mon, 24 Feb 2020 05:41:13 -0800 (PST) Received: from localhost ([::1]:36570 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j6Dyy-0003HA-9l for importer@patchew.org; Mon, 24 Feb 2020 08:41:12 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:42268) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j6Dxv-0001pb-R8 for qemu-devel@nongnu.org; Mon, 24 Feb 2020 08:40:11 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j6Dxs-0004IZ-2Q for qemu-devel@nongnu.org; Mon, 24 Feb 2020 08:40:07 -0500 Received: from mga04.intel.com ([192.55.52.120]:21084) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j6Dxr-0004HT-QP for qemu-devel@nongnu.org; Mon, 24 Feb 2020 08:40:04 -0500 Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 24 Feb 2020 05:39:57 -0800 Received: from snr.bj.intel.com ([10.240.193.90]) by FMSMGA003.fm.intel.com with ESMTP; 24 Feb 2020 05:39:55 -0800 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,480,1574150400"; d="scan'208";a="284354727" From: Luwei Kang To: pbonzini@redhat.com, rth@twiddle.net, ehabkost@redhat.com Subject: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT Date: Tue, 25 Feb 2020 05:38:30 +0800 Message-Id: <1582580312-19864-2-git-send-email-luwei.kang@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1582580312-19864-1-git-send-email-luwei.kang@intel.com> References: <1582580312-19864-1-git-send-email-luwei.kang@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.120 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: Luwei Kang , qemu-devel@nongnu.org, beeman.strong@intel.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The Intel PT packets which contain IP payloads will have LIP values, and it will include the CS base component if the CPUID.(EAX=3D14H,ECX=3D0H).ECX.[b= it31] is set. But it will disabled the Intel PT in kvm guest because of the need of live migration safe(c078ca9 i386: Disable Intel PT if packets IP payloads have LIP values). This patch will revert the previous limitation because the Intel new hardwa= re will set this bit and LIP =3D=3D RIP for most/all real code. Signed-off-by: Luwei Kang --- target/i386/cpu.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 69f518a..8c0d1e4 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -688,8 +688,6 @@ static CPUCacheInfo legacy_l3_cache =3D { * bit[02]: Support Single-Range Output scheme; */ #define INTEL_PT_MINIMAL_ECX 0x7 -/* generated packets which contain IP payloads have LIP values */ -#define INTEL_PT_IP_LIP (1 << 31) #define INTEL_PT_ADDR_RANGES_NUM 0x2 /* Number of configurable address ran= ges */ #define INTEL_PT_ADDR_RANGES_NUM_MASK 0x3 #define INTEL_PT_MTC_BITMAP (0x0249 << 16) /* Support ART(0,3,6,9) */ @@ -6281,8 +6279,7 @@ static void x86_cpu_filter_features(X86CPU *cpu, bool= verbose) ((eax_1 & INTEL_PT_ADDR_RANGES_NUM_MASK) < INTEL_PT_ADDR_RANGES_NUM) || ((ebx_1 & (INTEL_PT_PSB_BITMAP | INTEL_PT_CYCLE_BITMAP)) !=3D - (INTEL_PT_PSB_BITMAP | INTEL_PT_CYCLE_BITMAP)) || - (ecx_0 & INTEL_PT_IP_LIP)) { + (INTEL_PT_PSB_BITMAP | INTEL_PT_CYCLE_BITMAP))) { /* * Processor Trace capabilities aren't configurable, so if the * host can't emulate the capabilities we report on --=20 1.8.3.1