From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86F80191F7E for ; Mon, 25 Nov 2024 10:29:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732530571; cv=none; b=GtJKPthqiOHKntvlNwWFEZLzw94aCq7SJglC3qnkckqo/9rgPQEZBQ4y/KZvbjmH05eJCnRnlcN/7RgJovHZUbQY7dvllfCLiYj0LHg4FTYZ+Fsi1KIhcxHWbMh/lEPtwtFHb7BCSKTnXyG6s3G+K83Op5akE9vR40TZw57WOEE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732530571; c=relaxed/simple; bh=JVUhtawvLDRUwEkfSmuT4HO5ooTjF0Ona9TmzrHap6o=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=nskUoqejxkaxNEpVMfeiGSMDmIozj0nPx+kHCUz5hc7c7sT25A/mE4NPy8N/dQ/FD832OQ6RfaI+N0XPRfMWpf0nwJiz4Mkdni9xpTlPBi8iewP1nmnABBvXGH7p+utsAJWf+PH+cWaxY8caLmzRWbTivWmrS9fjiKTxxcHFF30= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=ujIsNFxc; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ujIsNFxc" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=yhWCNY2theg2cAIcWvRbdJeosieUTNG76cgsiJbqd8g=; b=ujIsNFxc4cCSbe0ujQ/UAXc+GK cKKoHJFIjlkQP6coYbEewFrHX9HCutlrZCmXH1iA0Egg1hD1pLpxJQZnrM4Td7832bhzVdIq4CXmh JoKXKTcfKKytiuJmeEOXccsY3Swnh1hZvBxQwq/VRyHLPFzst2y5ZFHxwa+XfKkvzPq+9RAYQ1+d6 VnpJ3DTzQxJLS1QebT+gd15ZlR3b3tS1kwzRKpDkbuvdjeekOAYNyFo5dSnUd2rYdfARO6Q/U3H5u R0bF/ilXwRT7IHe2qW+LGOAQjaQAO7teNOsTardBzjL5kbM8eOw7YbrmHAzzcXdAiLRsPL2RFbw/6 XjbnRjpA==; Received: from [54.239.6.187] (helo=edge-m3-r1-122.e-iad51.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tFWLF-0000000BkB5-3dGI; Mon, 25 Nov 2024 10:29:20 +0000 Message-ID: <8b7cd35ab5fec39b80eda8d5907b641af14c3272.camel@infradead.org> Subject: Re: [EXTERNAL] [RFC PATCH v3 01/20] x86/kexec: Ensure control_code_page is mapped in kexec page tables From: David Woodhouse To: kexec@lists.infradead.org, =?ISO-8859-1?Q?Sch=F6nherr=2C?= "Jan H." Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Kirill A. Shutemov" , Kai Huang , Nikolay Borisov , linux-kernel@vger.kernel.org, Simon Horman , Dave Young , Peter Zijlstra , jpoimboe@kernel.org, bsz@amazon.de Date: Mon, 25 Nov 2024 10:29:17 +0000 In-Reply-To: <20241125100815.2512-2-dwmw2@infradead.org> References: <20241125100815.2512-1-dwmw2@infradead.org> <20241125100815.2512-2-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-/rI6/xS8CNfSLar2S82a" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-/rI6/xS8CNfSLar2S82a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2024-11-25 at 09:54 +0000, David Woodhouse wrote: > From: David Woodhouse >=20 > The control_code_page should be explicitly mapped into the identity > mapped page tables for the relocate_kernel environment. This only seems > to have worked by luck before, because it tended to be within the same > 2MiB or 1GiB large page already mapped for another reason. >=20 > A subsequent commit will reduce the control_code_page to a single 4KiB > page instead of a higher-order allocation, and seems to make it much > *less* likely that we get lucky with its placement. This leads to a > fault when relocate_kernel() first tries to access the page through its > identity-mapped virtual address. This one is confusing me. Jan points out that it shouldn't be needed, because the control page should come from kernel memory and thus should be mapped anyway because the loop immediately below my added code adds *all* of the pfn_mapped[] ranges. And from code inspection he appears to be right, but if I disable the new mapping and add some printks... --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -247,15 +247,18 @@ static int init_pgtable(struct kimage *image, unsigne= d long control_page) info.direct_gbpages =3D true; =20 /* Ensure the control code page itself is in the direct map */ + pr_info("No Map control page at %lx", control_page); +#if 0 result =3D kernel_ident_mapping_init(&info, image->arch.pgd, contro= l_page, control_page + KEXEC_CONTROL_COD= E_MAX_SIZE); if (result) return result; - +#endif for (i =3D 0; i < nr_pfn_mapped; i++) { mstart =3D pfn_mapped[i].start << PAGE_SHIFT; mend =3D pfn_mapped[i].end << PAGE_SHIFT; =20 + pr_info("Map pfn_mapped[%d] %lx - %lx\n", i, mstart, mend); result =3D kernel_ident_mapping_init(&info, image->arch.pgd= , mstart, mend); if (result) ... and run in a version of qemu which dumps the CPU state on triple- fault... + ./loadret [ 0.948097] kexec: No Map control page at 2b32000 [ 0.948103] kexec: Map pfn_mapped[0] 0 - 7ffdd000 [ 0.960192] Freezing user space processes [ 0.961685] Freezing user space processes completed (elapsed 0.001 secon= ds) [ 0.962372] OOM killer disabled. [ 1.088668] ata2: found unknown device (class 0) [ 1.095810] Disabling non-boot CPUs ... [ 1.117990] smpboot: CPU 1 is now offline [ 1.118595] crash hp: kexec_trylock() failed, kdump image may be inaccur= ate RAX=3D0000000080050033 RBX=3D0000000000000000 RCX=3D0000000000000001 RDX=3D= 0000000000400000 RSI=3D0000000002b3205a RDI=3D0000000003a44002 RBP=3Dffff9709c2109400 RSP=3D= 0000000002b33000 R8 =3D0000000000000000 R9 =3D00000000038a0000 R10=3D0000000000000000 R11=3D= 0000000000000001 R12=3D0000000000000000 R13=3D0000000000170ef0 R14=3D00000000fee1dead R15=3D= 0000000000000000 RIP=3Dffff9709c2b32057 RFL=3D00010006 [-----P-] CPL=3D0 II=3D0 A20=3D1 SMM= =3D0 HLT=3D0 ES =3D0018 0000000000000000 ffffffff 00c09300 DPL=3D0 DS [-WA] CS =3D0010 0000000000000000 ffffffff 00a09b00 DPL=3D0 CS64 [-RA] SS =3D0018 0000000000000000 ffffffff 00c09300 DPL=3D0 DS [-WA] DS =3D0018 0000000000000000 ffffffff 00c09300 DPL=3D0 DS [-WA] FS =3D0018 0000000000000000 ffffffff 00c09300 DPL=3D0 DS [-WA] GS =3D0018 0000000000000000 ffffffff 00c09300 DPL=3D0 DS [-WA] LDT=3D0000 0000000000000000 00000000 00000000 TR =3D0040 fffffe2fb91b2000 00004087 00008b00 DPL=3D0 TSS64-busy GDT=3D 0000000000000000 00000000 IDT=3D 0000000000000000 00000000 CR0=3D80050033 CR2=3D0000000002b32ff8 CR3=3D00000000038a0000 CR4=3D00170ef0 DR0=3D0000000000000000 DR1=3D0000000000000000 DR2=3D0000000000000000 DR3=3D= 0000000000000000=20 DR6=3D00000000ffff0ff0 DR7=3D0000000000000400 EFER=3D0000000000000d01 Code=3D04 00 00 49 89 cb 48 8d a6 00 10 00 00 48 81 c6 5a 00 00 00 <56> c3 = cc 6a 00 52 48 8d 05 8c 04 00 00 50 66 ff 30 0f 01 14 24 48 83 c4 0a 8c d8 = 8e d8 48 RIP xxx057 is here, where relocate_kernel first touches the 1:1 mapping of = the control page: /* setup a new stack at the end of the physical control page */ lea PAGE_SIZE(%rsi), %rsp 49: 48 8d a6 00 10 00 00 lea 0x1000(%rsi),%rsp /* jump to identity mapped page */ addq $(identity_mapped - relocate_kernel), %rsi 50: 48 81 c6 5a 00 00 00 add $0x5a,%rsi pushq %rsi 57: 56 push %rsi The control page at 2b32xxx *really* ought to be mapped, as it's clearly within the 0 - 7ffdd000 range. 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