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Message-ID: <20210226111730.GL1854360@linux.ibm.com>
Date: Fri, 26 Feb 2021 13:17:30 +0200
From: Mike Rapoport <rppt@...ux.ibm.com>
To: George Kennedy <george.kennedy@...cle.com>
Cc: David Hildenbrand <david@...hat.com>,
Andrey Konovalov <andreyknvl@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Catalin Marinas <catalin.marinas@....com>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Konrad Rzeszutek Wilk <konrad@...nok.org>,
Will Deacon <will.deacon@....com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Alexander Potapenko <glider@...gle.com>,
Marco Elver <elver@...gle.com>,
Peter Collingbourne <pcc@...gle.com>,
Evgenii Stepanov <eugenis@...gle.com>,
Branislav Rankov <Branislav.Rankov@....com>,
Kevin Brodsky <kevin.brodsky@....com>,
Christoph Hellwig <hch@...radead.org>,
kasan-dev <kasan-dev@...glegroups.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux Memory Management List <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
Dhaval Giani <dhaval.giani@...cle.com>
Subject: Re: [PATCH] mm, kasan: don't poison boot memory
Hi George,
On Thu, Feb 25, 2021 at 08:19:18PM -0500, George Kennedy wrote:
>
> Mike,
>
> To get rid of the 0x00000000BE453000 hardcoding, I added the following patch
> to your above patch to get the iBFT table "address" to use with
> memblock_reserve():
>
> diff --git a/drivers/acpi/acpica/tbfind.c b/drivers/acpi/acpica/tbfind.c
> index 56d81e4..4bc7bf3 100644
> --- a/drivers/acpi/acpica/tbfind.c
> +++ b/drivers/acpi/acpica/tbfind.c
> @@ -120,3 +120,34 @@
> (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
> return_ACPI_STATUS(status);
> }
> +
> +acpi_physical_address
> +acpi_tb_find_table_address(char *signature)
> +{
> + acpi_physical_address address = 0;
> + struct acpi_table_desc *table_desc;
> + int i;
> +
> + ACPI_FUNCTION_TRACE(tb_find_table_address);
> +
> +printk(KERN_ERR "XXX acpi_tb_find_table_address: signature=%s\n",
> signature);
> +
> + (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
> + for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
> + if (memcmp(&(acpi_gbl_root_table_list.tables[i].signature),
> + signature, ACPI_NAMESEG_SIZE)) {
> +
> + /* Not the requested table */
> +
> + continue;
> + }
> +
> + /* Table with matching signature has been found */
> + table_desc = &acpi_gbl_root_table_list.tables[i];
> + address = table_desc->address;
> + }
> +
> + (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
> +printk(KERN_ERR "XXX acpi_tb_find_table_address(EXIT): address=%llx\n",
> address);
> + return address;
> +}
> diff --git a/drivers/firmware/iscsi_ibft_find.c
> b/drivers/firmware/iscsi_ibft_find.c
> index 95fc1a6..0de70b4 100644
> --- a/drivers/firmware/iscsi_ibft_find.c
> +++ b/drivers/firmware/iscsi_ibft_find.c
> @@ -28,6 +28,8 @@
>
> #include <asm/mmzone.h>
>
> +extern acpi_physical_address acpi_tb_find_table_address(char *signature);
> +
> /*
> * Physical location of iSCSI Boot Format Table.
> */
> @@ -116,24 +118,32 @@ void __init reserve_ibft_region(void)
> {
> struct acpi_table_ibft *table;
> unsigned long size;
> + acpi_physical_address address;
>
> table = find_ibft();
> if (!table)
> return;
>
> size = PAGE_ALIGN(table->header.length);
> + address = acpi_tb_find_table_address(table->header.signature);
> #if 0
> printk(KERN_ERR "XXX reserve_ibft_region: table=%llx,
> virt_to_phys(table)=%llx, size=%lx\n",
> (u64)table, virt_to_phys(table), size);
> memblock_reserve(virt_to_phys(table), size);
> #else
> -printk(KERN_ERR "XXX reserve_ibft_region: table=%llx, 0x00000000BE453000,
> size=%lx\n",
> - (u64)table, size);
> - memblock_reserve(0x00000000BE453000, size);
> +printk(KERN_ERR "XXX reserve_ibft_region: table=%llx, address=%llx,
> size=%lx\n",
> + (u64)table, address, size);
> + if (address)
> + memblock_reserve(address, size);
> + else
> + printk(KERN_ERR "%s: Can't find table address\n", __func__);
> #endif
>
> - if (efi_enabled(EFI_BOOT))
> + if (efi_enabled(EFI_BOOT)) {
> +printk(KERN_ERR "XXX reserve_ibft_region: calling acpi_put_table(%llx)\n",
> (u64)&table->header);
> acpi_put_table(&table->header);
> - else
> + } else {
> ibft_addr = table;
> +printk(KERN_ERR "XXX reserve_ibft_region: ibft_addr=%llx\n",
> (u64)ibft_addr);
> + }
> }
>
> Debug from the above:
> [ 0.050646] ACPI: Early table checksum verification disabled
> [ 0.051778] ACPI: RSDP 0x00000000BFBFA014 000024 (v02 BOCHS )
> [ 0.052922] ACPI: XSDT 0x00000000BFBF90E8 00004C (v01 BOCHS BXPCFACP
> 00000001 01000013)
> [ 0.054623] ACPI: FACP 0x00000000BFBF5000 000074 (v01 BOCHS BXPCFACP
> 00000001 BXPC 00000001)
> [ 0.056326] ACPI: DSDT 0x00000000BFBF6000 00238D (v01 BOCHS BXPCDSDT
> 00000001 BXPC 00000001)
> [ 0.058016] ACPI: FACS 0x00000000BFBFD000 000040
> [ 0.058940] ACPI: APIC 0x00000000BFBF4000 000090 (v01 BOCHS BXPCAPIC
> 00000001 BXPC 00000001)
> [ 0.060627] ACPI: HPET 0x00000000BFBF3000 000038 (v01 BOCHS BXPCHPET
> 00000001 BXPC 00000001)
> [ 0.062304] ACPI: BGRT 0x00000000BE49B000 000038 (v01 INTEL EDK2
> 00000002 01000013)
> [ 0.063987] ACPI: iBFT 0x00000000BE453000 000800 (v01 BOCHS BXPCFACP
> 00000000 00000000)
> [ 0.065683] XXX acpi_tb_find_table_address: signature=iBFT
> [ 0.066754] XXX acpi_tb_find_table_address(EXIT): address=be453000
> [ 0.067959] XXX reserve_ibft_region: table=ffffffffff240000,
> address=be453000, size=1000
> [ 0.069534] XXX reserve_ibft_region: calling
> acpi_put_table(ffffffffff240000)
>
> Not sure if it's the right thing to do, but added
> "acpi_tb_find_table_address()" to return the physical address of a table to
> use with memblock_reserve().
>
> virt_to_phys(table) does not seem to return the physical address for the
> iBFT table (it would be nice if struct acpi_table_header also had a
> "address" element for the physical address of the table).
virt_to_phys() does not work that early because then it is mapped with
early_memremap() which uses different virtual to physical scheme.
I'd say that acpi_tb_find_table_address() makes sense if we'd like to
reserve ACPI tables outside of drivers/acpi.
But probably we should simply reserve all the tables during
acpi_table_init() so that any table that firmware put in the normal memory
will be surely reserved.
> Ran 10 successful boots with the above without failure.
That's good news indeed :)
> George
> >
> >
--
Sincerely yours,
Mike.
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