From: Mike Rapoport <rppt@linux.ibm.com>
To: George Kennedy <george.kennedy@oracle.com>
Cc: David Hildenbrand <david@redhat.com>,
Andrey Konovalov <andreyknvl@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Dmitry Vyukov <dvyukov@google.com>,
Konrad Rzeszutek Wilk <konrad@darnok.org>,
Will Deacon <will.deacon@arm.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Peter Collingbourne <pcc@google.com>,
Evgenii Stepanov <eugenis@google.com>,
Branislav Rankov <Branislav.Rankov@arm.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Christoph Hellwig <hch@infradead.org>,
kasan-dev <kasan-dev@googlegroups.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Memory Management List <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Dhaval Giani <dhaval.giani@oracle.com>
Subject: Re: [PATCH] mm, kasan: don't poison boot memory
Date: Thu, 25 Feb 2021 10:53:00 +0200 [thread overview]
Message-ID: <20210225085300.GB1854360@linux.ibm.com> (raw)
In-Reply-To: <9b7251d1-7b90-db4f-fa5e-80165e1cbb4b@oracle.com>
Hi George,
> On 2/24/2021 5:37 AM, Mike Rapoport wrote:
> > On Tue, Feb 23, 2021 at 04:46:28PM -0500, George Kennedy wrote:
> > > Mike,
> > >
> > > Still no luck.
> > >
> > > [ 30.193723] iscsi: registered transport (iser)
> > > [ 30.195970] iBFT detected.
> > > [ 30.196571] BUG: unable to handle page fault for address: ffffffffff240004
> > Hmm, we cannot set ibft_addr to early pointer to the ACPI table.
> > Let's try something more disruptive and move the reservation back to
> > iscsi_ibft_find.c.
> >
> > diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
> > index 7bdc0239a943..c118dd54a747 100644
> > --- a/arch/x86/kernel/acpi/boot.c
> > +++ b/arch/x86/kernel/acpi/boot.c
> > @@ -1551,6 +1551,7 @@ void __init acpi_boot_table_init(void)
> > if (acpi_disabled)
> > return;
> > +#if 0
> > /*
> > * Initialize the ACPI boot-time table parser.
> > */
> > @@ -1558,6 +1559,7 @@ void __init acpi_boot_table_init(void)
> > disable_acpi();
> > return;
> > }
> > +#endif
> > acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
> > diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> > index d883176ef2ce..c615ce96c9a2 100644
> > --- a/arch/x86/kernel/setup.c
> > +++ b/arch/x86/kernel/setup.c
> > @@ -570,16 +570,6 @@ void __init reserve_standard_io_resources(void)
> > }
> > -static __init void reserve_ibft_region(void)
> > -{
> > - unsigned long addr, size = 0;
> > -
> > - addr = find_ibft_region(&size);
> > -
> > - if (size)
> > - memblock_reserve(addr, size);
> > -}
> > -
> > static bool __init snb_gfx_workaround_needed(void)
> > {
> > #ifdef CONFIG_PCI
> > @@ -1032,6 +1022,12 @@ void __init setup_arch(char **cmdline_p)
> > */
> > find_smp_config();
> > + /*
> > + * Initialize the ACPI boot-time table parser.
> > + */
> > + if (acpi_table_init())
> > + disable_acpi();
> > +
> > reserve_ibft_region();
> > early_alloc_pgt_buf();
> > diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c
> > index 64bb94523281..01be513843d6 100644
> > --- a/drivers/firmware/iscsi_ibft_find.c
> > +++ b/drivers/firmware/iscsi_ibft_find.c
> > @@ -47,7 +47,25 @@ static const struct {
> > #define VGA_MEM 0xA0000 /* VGA buffer */
> > #define VGA_SIZE 0x20000 /* 128kB */
> > -static int __init find_ibft_in_mem(void)
> > +static void __init *acpi_find_ibft_region(void)
> > +{
> > + int i;
> > + struct acpi_table_header *table = NULL;
> > + acpi_status status;
> > +
> > + if (acpi_disabled)
> > + return NULL;
> > +
> > + for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
> > + status = acpi_get_table(ibft_signs[i].sign, 0, &table);
> > + if (ACPI_SUCCESS(status))
> > + return table;
> > + }
> > +
> > + return NULL;
> > +}
> > +
> > +static void __init *find_ibft_in_mem(void)
> > {
> > unsigned long pos;
> > unsigned int len = 0;
> > @@ -70,35 +88,44 @@ static int __init find_ibft_in_mem(void)
> > /* if the length of the table extends past 1M,
> > * the table cannot be valid. */
> > if (pos + len <= (IBFT_END-1)) {
> > - ibft_addr = (struct acpi_table_ibft *)virt;
> > pr_info("iBFT found at 0x%lx.\n", pos);
> > - goto done;
> > + return virt;
> > }
> > }
> > }
> > }
> > -done:
> > - return len;
> > +
> > + return NULL;
> > }
> > +
> > +static void __init *find_ibft(void)
> > +{
> > + /* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will
> > + * only use ACPI for this */
> > + if (!efi_enabled(EFI_BOOT))
> > + return find_ibft_in_mem();
> > + else
> > + return acpi_find_ibft_region();
> > +}
> > +
> > /*
> > * Routine used to find the iSCSI Boot Format Table. The logical
> > * kernel address is set in the ibft_addr global variable.
> > */
> > -unsigned long __init find_ibft_region(unsigned long *sizep)
> > +void __init reserve_ibft_region(void)
> > {
> > - ibft_addr = NULL;
> > + struct acpi_table_ibft *table;
> > + unsigned long size;
> > - /* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will
> > - * only use ACPI for this */
> > + table = find_ibft();
> > + if (!table)
> > + return;
> > - if (!efi_enabled(EFI_BOOT))
> > - find_ibft_in_mem();
> > -
> > - if (ibft_addr) {
> > - *sizep = PAGE_ALIGN(ibft_addr->header.length);
> > - return (u64)virt_to_phys(ibft_addr);
> > - }
> > + size = PAGE_ALIGN(table->header.length);
> > + memblock_reserve(virt_to_phys(table), size);
> > - *sizep = 0;
> > - return 0;
> > + if (efi_enabled(EFI_BOOT))
> > + acpi_put_table(&table->header);
> > + else
> > + ibft_addr = table;
> > }
> > diff --git a/include/linux/iscsi_ibft.h b/include/linux/iscsi_ibft.h
> > index b7b45ca82bea..da813c891990 100644
> > --- a/include/linux/iscsi_ibft.h
> > +++ b/include/linux/iscsi_ibft.h
> > @@ -26,13 +26,9 @@ extern struct acpi_table_ibft *ibft_addr;
> > * mapped address is set in the ibft_addr variable.
> > */
> > #ifdef CONFIG_ISCSI_IBFT_FIND
> > -unsigned long find_ibft_region(unsigned long *sizep);
> > +void reserve_ibft_region(void);
> > #else
> > -static inline unsigned long find_ibft_region(unsigned long *sizep)
> > -{
> > - *sizep = 0;
> > - return 0;
> > -}
> > +static inline void reserve_ibft_region(void) {}
> > #endif
> > #endif /* ISCSI_IBFT_H */
>
> Still no luck Mike,
>
> We're back to the original problem where the only thing that worked was to
> run "SetPageReserved(page)" before calling "kmap(page)". The page is being
> "freed" before ibft_init() is called as a result of the recent buddy page
> freeing changes.
I keep missing some little details each time :(
Ok, let's try from the different angle.
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 4b9b329a5a92..ec43e1447336 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -7,6 +7,8 @@
*
*****************************************************************************/
+#include <linux/memblock.h>
+
#include <acpi/acpi.h>
#include "accommon.h"
#include "actables.h"
@@ -339,6 +341,21 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
acpi_tb_parse_fadt();
}
+ if (ACPI_SUCCESS(status) &&
+ ACPI_COMPARE_NAMESEG(&acpi_gbl_root_table_list.
+ tables[table_index].signature,
+ ACPI_SIG_IBFT)) {
+ struct acpi_table_header *ibft;
+ struct acpi_table_desc *desc;
+
+ desc = &acpi_gbl_root_table_list.tables[table_index];
+ status = acpi_tb_get_table(desc, &ibft);
+ if (ACPI_SUCCESS(status)) {
+ memblock_reserve(address, ibft->length);
+ acpi_tb_put_table(desc);
+ }
+ }
+
next_table:
table_entry += table_entry_size;
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2021-02-25 8:53 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-17 20:56 [PATCH] mm, kasan: don't poison boot memory Andrey Konovalov
2021-02-18 8:55 ` David Hildenbrand
2021-02-18 19:40 ` Andrey Konovalov
2021-02-18 19:46 ` David Hildenbrand
2021-02-18 20:26 ` Andrey Konovalov
2021-02-19 0:06 ` George Kennedy
2021-02-19 0:09 ` Andrey Konovalov
2021-02-19 16:45 ` George Kennedy
2021-02-19 23:04 ` George Kennedy
2021-02-22 9:52 ` David Hildenbrand
2021-02-22 15:13 ` George Kennedy
2021-02-22 16:13 ` David Hildenbrand
2021-02-22 16:39 ` David Hildenbrand
2021-02-22 17:40 ` Konrad Rzeszutek Wilk
2021-02-22 18:45 ` Mike Rapoport
2021-02-22 18:42 ` George Kennedy
2021-02-22 21:55 ` Mike Rapoport
[not found] ` <9773282a-2854-25a4-9faa-9da5dd34e371@oracle.com>
2021-02-23 10:33 ` Mike Rapoport
[not found] ` <3ef9892f-d657-207f-d4cf-111f98dcb55c@oracle.com>
2021-02-23 15:47 ` Mike Rapoport
2021-02-23 18:05 ` George Kennedy
2021-02-23 20:09 ` Mike Rapoport
2021-02-23 21:16 ` George Kennedy
2021-02-23 21:32 ` Mike Rapoport
2021-02-23 21:46 ` George Kennedy
2021-02-24 10:37 ` Mike Rapoport
2021-02-24 14:22 ` George Kennedy
2021-02-25 8:53 ` Mike Rapoport [this message]
2021-02-25 12:38 ` George Kennedy
2021-02-25 14:57 ` Mike Rapoport
2021-02-25 15:22 ` George Kennedy
2021-02-25 16:06 ` George Kennedy
2021-02-25 16:07 ` Mike Rapoport
2021-02-25 16:31 ` George Kennedy
2021-02-25 17:23 ` David Hildenbrand
2021-02-25 17:41 ` Mike Rapoport
2021-02-25 17:50 ` Mike Rapoport
2021-02-25 17:33 ` George Kennedy
2021-02-26 1:19 ` George Kennedy
2021-02-26 11:17 ` Mike Rapoport
2021-02-26 16:16 ` George Kennedy
2021-02-28 18:08 ` Mike Rapoport
2021-03-01 14:29 ` George Kennedy
2021-03-02 1:20 ` George Kennedy
2021-03-02 9:57 ` Mike Rapoport
2021-02-23 21:26 ` George Kennedy
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