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authorMarc Zyngier <marc.zyngier@arm.com>2013-04-12 19:12:03 +0100
committerChristoffer Dall <cdall@cs.columbia.edu>2013-04-28 22:23:08 -0700
commit2fb410596ca917fe6419be61ee5bc1782b17d947 (patch)
tree9b17527736eb0d7936c9d720721d946768ab5361 /arch/arm/kvm/mmu.c
parent3562c76dcb9ce84853c835eec12a911bf3a8e2da (diff)
downloadvexpress-lsk-2fb410596ca917fe6419be61ee5bc1782b17d947.tar.gz
ARM: KVM: move to a KVM provided HYP idmap
After the HYP page table rework, it is pretty easy to let the KVM code provide its own idmap, rather than expecting the kernel to provide it. It takes actually less code to do so. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
Diffstat (limited to 'arch/arm/kvm/mmu.c')
-rw-r--r--arch/arm/kvm/mmu.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 96d61daa23b..bfc59279de1 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -32,6 +32,7 @@
extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
+static pgd_t *hyp_pgd;
static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
@@ -715,12 +716,33 @@ phys_addr_t kvm_mmu_get_httbr(void)
int kvm_mmu_init(void)
{
+ unsigned long hyp_idmap_start = virt_to_phys(__hyp_idmap_text_start);
+ unsigned long hyp_idmap_end = virt_to_phys(__hyp_idmap_text_end);
+ int err;
+
+ hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
if (!hyp_pgd) {
kvm_err("Hyp mode PGD not allocated\n");
- return -ENOMEM;
+ err = -ENOMEM;
+ goto out;
+ }
+
+ /* Create the idmap in the boot page tables */
+ err = __create_hyp_mappings(boot_hyp_pgd,
+ hyp_idmap_start, hyp_idmap_end,
+ __phys_to_pfn(hyp_idmap_start),
+ PAGE_HYP);
+
+ if (err) {
+ kvm_err("Failed to idmap %lx-%lx\n",
+ hyp_idmap_start, hyp_idmap_end);
+ goto out;
}
return 0;
+out:
+ kfree(hyp_pgd);
+ return err;
}
/**