Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

[linux-2.6-microblaze.git] / arch / arm64 / mm / init.c

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index b16be52..37a8175 100644 (file)
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -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);