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KVM: arm64: Fix HYP idmap unmap when using 52bit PA

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Unmapping the idmap range using 52bit PA is quite broken, as we
don't take into account the right number of PGD entries, and rely
on PTRS_PER_PGD. The result is that pgd_index() truncates the
address, and we end-up in the weed.

Let's introduce a new unmap_hyp_idmap_range() that knows about this,
together with a kvm_pgd_index() helper, which hides a bit of the
complexity of the issue.

Fixes: 98732d1b18 ("KVM: arm/arm64: fix HYP ID map extension to 52 bits")
Reported-by: James Morse <james.morse@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2018-03-14 15:17:33 +00:00
parent 46fef158f1
commit 3ddd455653
1 changed files with 21 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
virt/kvm/arm/mmu.c
View File

@ -479,7 +479,13 @@ static void unmap_hyp_puds(pgd_t *pgd, phys_addr_t addr, phys_addr_t end)
clear_hyp_pgd_entry(pgd);
}
static void unmap_hyp_range(pgd_t *pgdp, phys_addr_t start, u64 size)
static unsigned int kvm_pgd_index(unsigned long addr, unsigned int ptrs_per_pgd)
{
return (addr >> PGDIR_SHIFT) & (ptrs_per_pgd - 1);
}
static void __unmap_hyp_range(pgd_t *pgdp, unsigned long ptrs_per_pgd,
phys_addr_t start, u64 size)
{
pgd_t *pgd;
phys_addr_t addr = start, end = start + size;
@ -489,7 +495,7 @@ static void unmap_hyp_range(pgd_t *pgdp, phys_addr_t start, u64 size)
* We don't unmap anything from HYP, except at the hyp tear down.
* Hence, we don't have to invalidate the TLBs here.
*/
pgd = pgdp + pgd_index(addr);
pgd = pgdp + kvm_pgd_index(addr, ptrs_per_pgd);
do {
next = pgd_addr_end(addr, end);
if (!pgd_none(*pgd))
@ -497,6 +503,16 @@ static void unmap_hyp_range(pgd_t *pgdp, phys_addr_t start, u64 size)
} while (pgd++, addr = next, addr != end);
}
static void unmap_hyp_range(pgd_t *pgdp, phys_addr_t start, u64 size)
{
__unmap_hyp_range(pgdp, PTRS_PER_PGD, start, size);
}
static void unmap_hyp_idmap_range(pgd_t *pgdp, phys_addr_t start, u64 size)
{
__unmap_hyp_range(pgdp, __kvm_idmap_ptrs_per_pgd(), start, size);
}
/**
* free_hyp_pgds - free Hyp-mode page tables
*
@ -512,13 +528,13 @@ void free_hyp_pgds(void)
mutex_lock(&kvm_hyp_pgd_mutex);
if (boot_hyp_pgd) {
unmap_hyp_range(boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
unmap_hyp_idmap_range(boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
free_pages((unsigned long)boot_hyp_pgd, hyp_pgd_order);
boot_hyp_pgd = NULL;
}
if (hyp_pgd) {
unmap_hyp_range(hyp_pgd, hyp_idmap_start, PAGE_SIZE);
unmap_hyp_idmap_range(hyp_pgd, hyp_idmap_start, PAGE_SIZE);
unmap_hyp_range(hyp_pgd, kern_hyp_va(PAGE_OFFSET),
(uintptr_t)high_memory - PAGE_OFFSET);
unmap_hyp_range(hyp_pgd, kern_hyp_va(VMALLOC_START),
@ -634,7 +650,7 @@ static int __create_hyp_mappings(pgd_t *pgdp, unsigned long ptrs_per_pgd,
addr = start & PAGE_MASK;
end = PAGE_ALIGN(end);
do {
pgd = pgdp + ((addr >> PGDIR_SHIFT) & (ptrs_per_pgd - 1));
pgd = pgdp + kvm_pgd_index(addr, ptrs_per_pgd);
if (pgd_none(*pgd)) {
pud = pud_alloc_one(NULL, addr);