x86: Use find_e820() instead of hard coded trampoline address
Jens found the following crash/regression:
[ 0.000000] found SMP MP-table at [ffff8800000fdd80] fdd80
[ 0.000000] Kernel panic - not syncing: Overlapping early reservations 12-f011 MP-table mpc to 0-fff BIOS data page
and
[ 0.000000] Kernel panic - not syncing: Overlapping early reservations 12-f011 MP-table mpc to 6000-7fff TRAMPOLINE
and bisected it to b24c2a9
("x86: Move find_smp_config()
earlier and avoid bootmem usage").
It turns out the BIOS is using the first 64k for mptable,
without reserving it.
So try to find good range for the real-mode trampoline instead of
hard coding it, in case some bios tries to use that range for sth.
Reported-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Tested-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
LKML-Reference: <4B21630A.6000308@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
parent
ebb682f522
commit
893f38d144
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@ -16,7 +16,6 @@ extern unsigned long initial_code;
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extern unsigned long initial_gs;
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#define TRAMPOLINE_SIZE roundup(trampoline_end - trampoline_data, PAGE_SIZE)
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#define TRAMPOLINE_BASE 0x6000
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extern unsigned long setup_trampoline(void);
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extern void __init reserve_trampoline_memory(void);
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@ -732,7 +732,16 @@ struct early_res {
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char overlap_ok;
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};
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static struct early_res early_res[MAX_EARLY_RES] __initdata = {
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{ 0, PAGE_SIZE, "BIOS data page" }, /* BIOS data page */
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{ 0, PAGE_SIZE, "BIOS data page", 1 }, /* BIOS data page */
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#ifdef CONFIG_X86_32
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/*
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* But first pinch a few for the stack/trampoline stuff
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* FIXME: Don't need the extra page at 4K, but need to fix
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* trampoline before removing it. (see the GDT stuff)
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*/
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{ PAGE_SIZE, PAGE_SIZE, "EX TRAMPOLINE", 1 },
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#endif
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{}
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};
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@ -29,8 +29,6 @@ static void __init i386_default_early_setup(void)
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void __init i386_start_kernel(void)
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{
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reserve_trampoline_memory();
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reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS");
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#ifdef CONFIG_BLK_DEV_INITRD
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@ -98,8 +98,6 @@ void __init x86_64_start_reservations(char *real_mode_data)
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{
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copy_bootdata(__va(real_mode_data));
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reserve_trampoline_memory();
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reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS");
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#ifdef CONFIG_BLK_DEV_INITRD
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@ -945,9 +945,6 @@ void __init early_reserve_e820_mpc_new(void)
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{
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if (enable_update_mptable && alloc_mptable) {
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u64 startt = 0;
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#ifdef CONFIG_X86_TRAMPOLINE
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startt = TRAMPOLINE_BASE;
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#endif
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mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
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}
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}
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@ -73,6 +73,7 @@
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#include <asm/mtrr.h>
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#include <asm/apic.h>
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#include <asm/trampoline.h>
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#include <asm/e820.h>
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#include <asm/mpspec.h>
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#include <asm/setup.h>
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@ -875,6 +876,13 @@ void __init setup_arch(char **cmdline_p)
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reserve_brk();
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/*
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* Find and reserve possible boot-time SMP configuration:
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*/
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find_smp_config();
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reserve_trampoline_memory();
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#ifdef CONFIG_ACPI_SLEEP
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/*
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* Reserve low memory region for sleep support.
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@ -921,11 +929,6 @@ void __init setup_arch(char **cmdline_p)
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early_acpi_boot_init();
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/*
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* Find and reserve possible boot-time SMP configuration:
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*/
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find_smp_config();
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#ifdef CONFIG_ACPI_NUMA
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/*
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* Parse SRAT to discover nodes.
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@ -12,21 +12,19 @@
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#endif
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/* ready for x86_64 and x86 */
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unsigned char *__trampinitdata trampoline_base = __va(TRAMPOLINE_BASE);
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unsigned char *__trampinitdata trampoline_base;
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void __init reserve_trampoline_memory(void)
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{
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#ifdef CONFIG_X86_32
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/*
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* But first pinch a few for the stack/trampoline stuff
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* FIXME: Don't need the extra page at 4K, but need to fix
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* trampoline before removing it. (see the GDT stuff)
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*/
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reserve_early(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, "EX TRAMPOLINE");
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#endif
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unsigned long mem;
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/* Has to be in very low memory so we can execute real-mode AP code. */
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reserve_early(TRAMPOLINE_BASE, TRAMPOLINE_BASE + TRAMPOLINE_SIZE,
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"TRAMPOLINE");
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mem = find_e820_area(0, 1<<20, TRAMPOLINE_SIZE, PAGE_SIZE);
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if (mem == -1L)
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panic("Cannot allocate trampoline\n");
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trampoline_base = __va(mem);
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reserve_early(mem, mem + TRAMPOLINE_SIZE, "TRAMPOLINE");
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}
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/*
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