[PATCH] mm, kasan: don't poison boot memory
Mike Rapoport
rppt at linux.ibm.com
Thu Feb 25 09:57:00 EST 2021
On Thu, Feb 25, 2021 at 07:38:19AM -0500, George Kennedy wrote:
> On 2/25/2021 3:53 AM, Mike Rapoport wrote:
> > 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 :(
> No worries. Thanks for all your help. Does this patch go on top of your
> previous patch or is it standalone?
This is standalone.
> George
> > 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.
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