From patchwork Tue Feb 21 16:36:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mingwei Zhang X-Patchwork-Id: 13148195 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97C68C64ED9 for ; Tue, 21 Feb 2023 16:37:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234710AbjBUQhY (ORCPT ); Tue, 21 Feb 2023 11:37:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34806 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234678AbjBUQhV (ORCPT ); Tue, 21 Feb 2023 11:37:21 -0500 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65118279AD for ; Tue, 21 Feb 2023 08:37:19 -0800 (PST) Received: by mail-pf1-x44a.google.com with SMTP id cn3-20020a056a00340300b0059085684b50so2595742pfb.16 for ; Tue, 21 Feb 2023 08:37:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=2iAI7qeN019fW7cnXiCIU1jbXC6JQmM9w058O8z3YH8=; b=XdkwDudCAzkUeqDZelIh5hAd5V3dHZzXBuFYZkqJd4pFfa+UTybJ8/AW+lAhYwqmS+ tbVt7VgxCnQmFM8/M2zF08LXl+P5rYttqkZsSMpRyNm2aUA2qkAZtGyIcbLnnVGKH7MB vhtd85nvW4gXenpyrZSEHHvz0+5qG0Ei5unm5oCB1/Qmmt3XyFzr8cJWPQfnh05mvVAV jpcjB8DFA/xaMuE68egf7ZIkGP57N7Fc7cCyBUTy31SaY7FwcTnTA1B86Fv9eMZ5LzA+ OY1P17jE1KaBI0GR9zW0iasO6w+Zn6hq5XF74zuLr9/ITXX3ToAx4IVTHsLJQoRAX22W ccKg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=2iAI7qeN019fW7cnXiCIU1jbXC6JQmM9w058O8z3YH8=; b=wFnVBQ011rvLM0iQWG+MUHrDCPsImTEH1uV8wJfa/owwg/ebLXXbNbR/FHEHT5Y5al wflfDKLbashJD0O3EpqAmjEknCE2/UmyPKdGrswO9A8QIrc+SRD6cREbzfrrYAckDWmv LRkcnlbqzBK7/CxZcvmJc8KkcWUKFRSmthXEMBXyKL3GNbhixSJre/28nyWlvpQFoPnz 2YdI3szcKAYpc2UDzITapa81bF2zKA+b4jhJqcfL8BRr21ESponlFgBX4iDAVkQq/95k /q07H54HBAIBCgqOxtJSZSoZmLRM7R7Z/x0JW44zYjUU92+5hiJFWVyzISeOIiQ9R5uZ WjcA== X-Gm-Message-State: AO0yUKWuOEkjhg1TIi28DmQGxFM60MOpFFOZKzEKsdGkZhzan+KYAUlR 27XbMt0rFYW3Ad9+/OSJSDnxYqYppqzF X-Google-Smtp-Source: AK7set8LvhHN5qmTlVL5B5s+7zuXmCqcFbefrPXxO60eZ8HvEU34oKqDiVYD48Dd6NrtMWxW9iZ6W1TH5i+F X-Received: from mizhang-super.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1071]) (user=mizhang job=sendgmr) by 2002:a63:2c4f:0:b0:502:2111:ba7c with SMTP id s76-20020a632c4f000000b005022111ba7cmr669064pgs.2.1676997438814; Tue, 21 Feb 2023 08:37:18 -0800 (PST) Reply-To: Mingwei Zhang Date: Tue, 21 Feb 2023 16:36:43 +0000 In-Reply-To: <20230221163655.920289-1-mizhang@google.com> Mime-Version: 1.0 References: <20230221163655.920289-1-mizhang@google.com> X-Mailer: git-send-email 2.39.2.637.g21b0678d19-goog Message-ID: <20230221163655.920289-2-mizhang@google.com> Subject: [PATCH v3 01/13] x86/fpu/xstate: Avoid getting xstate address of init_fpstate if fpstate contains the component From: Mingwei Zhang To: Sean Christopherson , Paolo Bonzini , Thomas Gleixner Cc: "H. Peter Anvin" , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, Mingwei Zhang , Jim Mattson , Venkatesh Srinivas , Aaron Lewis , "Chang S. Bae" , Chao Gao Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Avoid getting xstate address of init_fpstate if fpstate contains the xstate component. Since XTILEDATA (bit 18) was turned off in xinit, when KVM calls __raw_xsave_addr(xinit, 18), it triggers a warning as follows. __raw_xsave_addr() is an internal function that assume caller does the checking, ie., all function arguments should be checked before calling. So, instead of removing the WARNING, add checks in __copy_xstate_to_uabi_buf(). [ 168.814082] ------------[ cut here ]------------ [ 168.814083] WARNING: CPU: 35 PID: 15304 at arch/x86/kernel/fpu/xstate.c:934 __raw_xsave_addr+0xc8/0xe0 [ 168.814088] Modules linked in: kvm_intel dummy bridge stp llc cdc_ncm cdc_eem cdc_ether usbnet mii ehci_pci ehci_hcd vfat fat cdc_acm xhci_pci xhci_hcd idpf(O) [ 168.814100] CPU: 35 PID: 15304 Comm: amx_test Tainted: G S O 6.2.0-smp-DEV #6 [ 168.814103] RIP: 0010:__raw_xsave_addr+0xc8/0xe0 [ 168.814105] Code: 83 f9 40 72 b0 eb 10 48 63 ca 44 8b 04 8d 60 13 1e 82 eb 03 41 89 f8 44 89 c1 48 01 c8 48 83 c4 08 5d c3 cc 0f 0b 31 c0 eb f3 <0f> 0b 48 c7 c7 c7 28 11 82 e8 da 30 b0 00 31 c0 eb e1 66 0f 1f 44 [ 168.814106] RSP: 0018:ff110020ef79bc90 EFLAGS: 00010246 [ 168.814108] RAX: ffffffff821e0340 RBX: 0000000000000012 RCX: 0000000000000012 [ 168.814109] RDX: 0000000000000012 RSI: 80000000000206e7 RDI: 0000000000040000 [ 168.814110] RBP: ff110020ef79bc98 R08: 0000000000000a00 R09: 0000000000000012 [ 168.814112] R10: 0000000000000012 R11: 0000000000000004 R12: ffa00000089f2a40 [ 168.814113] R13: 0000001200000000 R14: 0000000000000012 R15: ff110020ef288b00 [ 168.814114] FS: 00007f1812761300(0000) GS:ff11003fff4c0000(0000) knlGS:0000000000000000 [ 168.814116] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 168.814117] CR2: 00007f1812555008 CR3: 0000002093a80002 CR4: 0000000000373ee0 [ 168.814118] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 168.814119] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400 [ 168.814120] Call Trace: [ 168.814121] [ 168.814122] __copy_xstate_to_uabi_buf+0x3cb/0x520 [ 168.814125] fpu_copy_guest_fpstate_to_uabi+0x29/0x50 [ 168.814127] kvm_arch_vcpu_ioctl+0x9f7/0xee0 [ 168.814130] ? __kmem_cache_free+0x16b/0x220 [ 168.814133] kvm_vcpu_ioctl+0x47c/0x5a0 [ 168.814136] __se_sys_ioctl+0x77/0xc0 [ 168.814138] __x64_sys_ioctl+0x1d/0x20 [ 168.814139] do_syscall_64+0x3d/0x80 [ 168.814142] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 168.814146] RIP: 0033:0x7f1812892c87 [ 168.814148] Code: 5d c3 cc 48 8b 05 39 1d 07 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 cc cc cc cc cc cc cc cc cc cc b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 09 1d 07 00 f7 d8 64 89 01 48 [ 168.814149] RSP: 002b:00007ffc4cebf538 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 168.814151] RAX: ffffffffffffffda RBX: 00007f1812761280 RCX: 00007f1812892c87 [ 168.814152] RDX: 00000000004dcda0 RSI: 000000009000aecf RDI: 0000000000000007 [ 168.814153] RBP: 0000000000002b00 R08: 00000000004d5010 R09: 0000000000002710 [ 168.814154] R10: 00007f1812906980 R11: 0000000000000246 R12: 00000000004d8110 [ 168.814155] R13: 0000000000000004 R14: 00000000004d78b0 R15: 0000000000000004 [ 168.814156] [ 168.814157] ---[ end trace 0000000000000000 ]--- Fixes: e84ba47e313d ("x86/fpu: Hook up PKRU into ptrace()") Signed-off-by: Mingwei Zhang --- arch/x86/kernel/fpu/xstate.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index 714166cc25f2..5cc1426c3800 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -1063,6 +1063,7 @@ void __copy_xstate_to_uabi_buf(struct membuf to, struct fpstate *fpstate, struct xregs_state *xsave = &fpstate->regs.xsave; struct xstate_header header; unsigned int zerofrom; + void *xsave_addr; u64 mask; int i; @@ -1151,10 +1152,11 @@ void __copy_xstate_to_uabi_buf(struct membuf to, struct fpstate *fpstate, pkru.pkru = pkru_val; membuf_write(&to, &pkru, sizeof(pkru)); } else { - copy_feature(header.xfeatures & BIT_ULL(i), &to, - __raw_xsave_addr(xsave, i), - __raw_xsave_addr(xinit, i), - xstate_sizes[i]); + xsave_addr = (header.xfeatures & BIT_ULL(i)) ? + __raw_xsave_addr(xsave, i) : + __raw_xsave_addr(xinit, i); + + membuf_write(&to, xsave_addr, xstate_sizes[i]); } /* * Keep track of the last copied state in the non-compacted