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arm64 fixes:

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- Limit the linear region to 51-bit when KVM is running in nVHE mode
   otherwise, depending on the placement of the ID map, kernel-VA to
   hyp-VA translations may produce addresses that either conflict with
   other HYP mappings or generate addresses outside of the 52-bit
   addressable range.
 
 - Instruct kmemleak not to scan the memory reserved for kdump as this
   range is removed from the kernel linear map and therefore not
   accessible.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - Limit the linear region to 51-bit when KVM is running in nVHE mode.

   Otherwise, depending on the placement of the ID map, kernel-VA to
   hyp-VA translations may produce addresses that either conflict with
   other HYP mappings or generate addresses outside of the 52-bit
   addressable range.

 - Instruct kmemleak not to scan the memory reserved for kdump as this
   range is removed from the kernel linear map and therefore not
   accessible.

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: kdump: Skip kmemleak scan reserved memory for kdump
  arm64: mm: limit linear region to 51 bits for KVM in nVHE mode
This commit is contained in:
Linus Torvalds 2021-09-10 11:58:20 -07:00
commit e99f23c5bf
1 changed files with 21 additions and 1 deletions
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22
arch/arm64/mm/init.c
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@ -30,6 +30,7 @@
#include <linux/crash_dump.h>
#include <linux/hugetlb.h>
#include <linux/acpi_iort.h>
#include <linux/kmemleak.h>
#include <asm/boot.h>
#include <asm/fixmap.h>
@ -101,6 +102,11 @@ static void __init reserve_crashkernel(void)
pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
crash_base, crash_base + crash_size, crash_size >> 20);
/*
* The crashkernel memory will be removed from the kernel linear
* map. Inform kmemleak so that it won't try to access it.
*/
kmemleak_ignore_phys(crash_base);
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
}
@ -222,7 +228,21 @@ early_param("mem", early_mem);
void __init arm64_memblock_init(void)
{
const s64 linear_region_size = PAGE_END - _PAGE_OFFSET(vabits_actual);
s64 linear_region_size = PAGE_END - _PAGE_OFFSET(vabits_actual);
/*
* Corner case: 52-bit VA capable systems running KVM in nVHE mode may
* be limited in their ability to support a linear map that exceeds 51
* bits of VA space, depending on the placement of the ID map. Given
* that the placement of the ID map may be randomized, let's simply
* limit the kernel's linear map to 51 bits as well if we detect this
* configuration.
*/
if (IS_ENABLED(CONFIG_KVM) && vabits_actual == 52 &&
is_hyp_mode_available() && !is_kernel_in_hyp_mode()) {
pr_info("Capping linear region to 51 bits for KVM in nVHE mode on LVA capable hardware.\n");
linear_region_size = min_t(u64, linear_region_size, BIT(51));
}
/* Remove memory above our supported physical address size */
memblock_remove(1ULL << PHYS_MASK_SHIFT, ULLONG_MAX);