diff options
authorKristina Martsenko <kristina.martsenko@arm.com>2018-01-15 15:23:49 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2018-01-15 18:20:26 +0000
commit98732d1b189b626a7593afd02dc3d2dc3f6c545a (patch)
parent6a205420758af5625429a2e77a2654abbf59ac09 (diff)
KVM: arm/arm64: fix HYP ID map extension to 52 bits
Commit fa2a8445b1d3 incorrectly masks the index of the HYP ID map pgd entry, causing a non-VHE kernel to hang during boot. This happens when VA_BITS=48 and the ID map text is in 52-bit physical memory. In this case we don't need an extra table level but need more entries in the top-level table, so we need to map into hyp_pgd and need to use __kvm_idmap_ptrs_per_pgd to mask in the extra bits. However, __create_hyp_mappings currently masks by PTRS_PER_PGD instead. Fix it so that we always use __kvm_idmap_ptrs_per_pgd for the HYP ID map. This ensures that we use the larger mask for the top-level ID map table when it has more entries. In all other cases, PTRS_PER_PGD is used as normal. Fixes: fa2a8445b1d3 ("arm64: allow ID map to be extended to 52 bits") Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
1 files changed, 6 insertions, 12 deletions
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index 761787befd3b..876caf531d32 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -623,21 +623,15 @@ static int create_hyp_pud_mappings(pgd_t *pgd, unsigned long start,
return 0;
-static int __create_hyp_mappings(pgd_t *pgdp,
+static int __create_hyp_mappings(pgd_t *pgdp, unsigned long ptrs_per_pgd,
unsigned long start, unsigned long end,
unsigned long pfn, pgprot_t prot)
pgd_t *pgd;
pud_t *pud;
- unsigned long addr, next, ptrs_per_pgd = PTRS_PER_PGD;
+ unsigned long addr, next;
int err = 0;
- /*
- * If it's not the hyp_pgd, fall back to the kvm idmap layout.
- */
- if (pgdp != hyp_pgd)
- ptrs_per_pgd = __kvm_idmap_ptrs_per_pgd();
addr = start & PAGE_MASK;
end = PAGE_ALIGN(end);
@@ -705,8 +699,8 @@ int create_hyp_mappings(void *from, void *to, pgprot_t prot)
int err;
phys_addr = kvm_kaddr_to_phys(from + virt_addr - start);
- err = __create_hyp_mappings(hyp_pgd, virt_addr,
- virt_addr + PAGE_SIZE,
+ err = __create_hyp_mappings(hyp_pgd, PTRS_PER_PGD,
+ virt_addr, virt_addr + PAGE_SIZE,
if (err)
@@ -737,7 +731,7 @@ int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr)
if (!is_vmalloc_addr(from) || !is_vmalloc_addr(to - 1))
return -EINVAL;
- return __create_hyp_mappings(hyp_pgd, start, end,
+ return __create_hyp_mappings(hyp_pgd, PTRS_PER_PGD, start, end,
__phys_to_pfn(phys_addr), PAGE_HYP_DEVICE);
@@ -1743,7 +1737,7 @@ static int kvm_map_idmap_text(pgd_t *pgd)
int err;
/* Create the idmap in the boot page tables */
- err = __create_hyp_mappings(pgd,
+ err = __create_hyp_mappings(pgd, __kvm_idmap_ptrs_per_pgd(),
hyp_idmap_start, hyp_idmap_end,