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Tue, 23 Feb 2021 15:48:03 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C0698AE045; Tue, 23 Feb 2021 15:48:00 +0000 (GMT) Received: from linux.ibm.com (unknown [9.145.51.238]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Tue, 23 Feb 2021 15:48:00 +0000 (GMT) Date: Tue, 23 Feb 2021 17:47:58 +0200 From: Mike Rapoport To: George Kennedy Cc: David Hildenbrand , Andrey Konovalov , Andrew Morton , Catalin Marinas , Vincenzo Frascino , Dmitry Vyukov , Konrad Rzeszutek Wilk , Will Deacon , Andrey Ryabinin , Alexander Potapenko , Marco Elver , Peter Collingbourne , Evgenii Stepanov , Branislav Rankov , Kevin Brodsky , Christoph Hellwig , kasan-dev , Linux ARM , Linux Memory Management List , LKML , Dhaval Giani Subject: Re: [PATCH] mm, kasan: don't poison boot memory Message-ID: <20210223154758.GF1741768@linux.ibm.com> References: <797fae72-e3ea-c0b0-036a-9283fa7f2317@oracle.com> <1ac78f02-d0af-c3ff-cc5e-72d6b074fc43@redhat.com> <56c97056-6d8b-db0e-e303-421ee625abe3@redhat.com> <20210222215502.GB1741768@linux.ibm.com> <9773282a-2854-25a4-9faa-9da5dd34e371@oracle.com> <20210223103321.GD1741768@linux.ibm.com> <3ef9892f-d657-207f-d4cf-111f98dcb55c@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <3ef9892f-d657-207f-d4cf-111f98dcb55c@oracle.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-02-23_08:2021-02-23,2021-02-23 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=999 phishscore=0 spamscore=0 impostorscore=0 malwarescore=0 bulkscore=0 adultscore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102230131 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi George, On Tue, Feb 23, 2021 at 09:35:32AM -0500, George Kennedy wrote: > > On 2/23/2021 5:33 AM, Mike Rapoport wrote: > > (re-added CC) > > > > On Mon, Feb 22, 2021 at 08:24:59PM -0500, George Kennedy wrote: > > > On 2/22/2021 4:55 PM, Mike Rapoport wrote: > > > > On Mon, Feb 22, 2021 at 01:42:56PM -0500, George Kennedy wrote: > > > > > On 2/22/2021 11:13 AM, David Hildenbrand wrote: > > > > > > On 22.02.21 16:13, George Kennedy wrote: > > > > > > > > > > > > The PFN 0xbe453 looks a little strange, though. Do we expect ACPI tables > > > > > > close to 3 GiB ? No idea. Could it be that you are trying to map a wrong > > > > > > table? Just a guess. > > > > > > > > > > > > > What would be  the correct way to reserve the page so that the above > > > > > > > would not be hit? > > > > > > I would have assumed that if this is a binary blob, that someone (which > > > > > > I think would be acpi code) reserved via memblock_reserve() early during > > > > > > boot. > > > > > > > > > > > > E.g., see drivers/acpi/tables.c:acpi_table_upgrade()->memblock_reserve(). > > > > > acpi_table_upgrade() gets called, but bails out before memblock_reserve() is > > > > > called. Thus, it appears no pages are getting reserved. > > > > acpi_table_upgrade() does not actually reserve memory but rather open > > > > codes memblock allocation with memblock_find_in_range() + > > > > memblock_reserve(), so it does not seem related anyway. > > > > > > > > Do you have by chance a full boot log handy? > > > Hello Mike, > > > > > > Are you after the console output? See attached. > > > > > > It includes my patch to set PG_Reserved along with the dump_page() debug > > > that David asked for - see: "page:" > > So, iBFT is indeed at pfn 0xbe453: > > > > [ 0.077698] ACPI: iBFT 0x00000000BE453000 000800 (v01 BOCHS BXPCFACP 00000000 00000000) > > and it's in E820_TYPE_RAM region rather than in ACPI data: > > > > [ 0.000000] BIOS-e820: [mem 0x0000000000810000-0x00000000008fffff] ACPI NVS > > [ 0.000000] BIOS-e820: [mem 0x0000000000900000-0x00000000be49afff] usable > > [ 0.000000] BIOS-e820: [mem 0x00000000be49b000-0x00000000be49bfff] ACPI data > > > > I could not find anywhere in x86 setup or in ACPI tables parsing the code > > that reserves this memory or any other ACPI data for that matter. It could > > be that I've missed some copying of the data to statically allocated > > initial_tables, but AFAICS any ACPI data that was not marked as such in > > e820 tables by BIOS resides in memory that is considered as free. > > > > Close... > > Applied the patch, see "[   30.136157] iBFT detected.", but now hit the > following (missing iounmap()? see full console output attached): > > diff --git a/drivers/firmware/iscsi_ibft_find.c > b/drivers/firmware/iscsi_ibft_find.c > index 64bb945..2e5e040 100644 > --- a/drivers/firmware/iscsi_ibft_find.c > +++ b/drivers/firmware/iscsi_ibft_find.c > @@ -80,6 +80,21 @@ static int __init find_ibft_in_mem(void) >  done: >         return len; >  } > + > +static void __init acpi_find_ibft_region(void) > +{ > +       int i; > +       struct acpi_table_header *table = NULL; > + > +       if (acpi_disabled) > +               return; > + > +       for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) { > +               acpi_get_table(ibft_signs[i].sign, 0, &table); > +               ibft_addr = (struct acpi_table_ibft *)table; Can you try adding acpi_put_table(table); here? > +       } > +} > + -- Sincerely yours, Mike.