ARM: KVM: perform HYP initilization for hotplugged CPUs

[linux-2.6-microblaze.git] / arch / arm / include / asm / kvm_mmu.h

diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index 421a20b..472ac70 100644 (file)
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -19,9 +19,33 @@
 #ifndef __ARM_KVM_MMU_H__
 #define __ARM_KVM_MMU_H__
 
+#include <asm/memory.h>
+#include <asm/page.h>
+
+/*
+ * We directly use the kernel VA for the HYP, as we can directly share
+ * the mapping (HTTBR "covers" TTBR1).
+ */
+#define HYP_PAGE_OFFSET_MASK   UL(~0)
+#define HYP_PAGE_OFFSET                PAGE_OFFSET
+#define KERN_TO_HYP(kva)       (kva)
+
+/*
+ * Our virtual mapping for the boot-time MMU-enable code. Must be
+ * shared across all the page-tables. Conveniently, we use the vectors
+ * page, where no kernel data will ever be shared with HYP.
+ */
+#define TRAMPOLINE_VA          UL(CONFIG_VECTORS_BASE)
+
+#ifndef __ASSEMBLY__
+
+#include <asm/cacheflush.h>
+#include <asm/pgalloc.h>
+
 int create_hyp_mappings(void *from, void *to);
 int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
-void free_hyp_pmds(void);
+void free_boot_hyp_pgd(void);
+void free_hyp_pgds(void);
 
 int kvm_alloc_stage2_pgd(struct kvm *kvm);
 void kvm_free_stage2_pgd(struct kvm *kvm);
@@ -33,9 +57,21 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run);
 void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
 
 phys_addr_t kvm_mmu_get_httbr(void);
+phys_addr_t kvm_mmu_get_boot_httbr(void);
+phys_addr_t kvm_get_idmap_vector(void);
 int kvm_mmu_init(void);
 void kvm_clear_hyp_idmap(void);
 
+static inline void kvm_set_pte(pte_t *pte, pte_t new_pte)
+{
+       pte_val(*pte) = new_pte;
+       /*
+        * flush_pmd_entry just takes a void pointer and cleans the necessary
+        * cache entries, so we can reuse the function for ptes.
+        */
+       flush_pmd_entry(pte);
+}
+
 static inline bool kvm_is_write_fault(unsigned long hsr)
 {
        unsigned long hsr_ec = hsr >> HSR_EC_SHIFT;
@@ -47,4 +83,53 @@ static inline bool kvm_is_write_fault(unsigned long hsr)
                return true;
 }
 
+static inline void kvm_clean_pgd(pgd_t *pgd)
+{
+       clean_dcache_area(pgd, PTRS_PER_S2_PGD * sizeof(pgd_t));
+}
+
+static inline void kvm_clean_pmd_entry(pmd_t *pmd)
+{
+       clean_pmd_entry(pmd);
+}
+
+static inline void kvm_clean_pte(pte_t *pte)
+{
+       clean_pte_table(pte);
+}
+
+static inline void kvm_set_s2pte_writable(pte_t *pte)
+{
+       pte_val(*pte) |= L_PTE_S2_RDWR;
+}
+
+struct kvm;
+
+static inline void coherent_icache_guest_page(struct kvm *kvm, gfn_t gfn)
+{
+       /*
+        * If we are going to insert an instruction page and the icache is
+        * either VIPT or PIPT, there is a potential problem where the host
+        * (or another VM) may have used the same page as this guest, and we
+        * read incorrect data from the icache.  If we're using a PIPT cache,
+        * we can invalidate just that page, but if we are using a VIPT cache
+        * we need to invalidate the entire icache - damn shame - as written
+        * in the ARM ARM (DDI 0406C.b - Page B3-1393).
+        *
+        * VIVT caches are tagged using both the ASID and the VMID and doesn't
+        * need any kind of flushing (DDI 0406C.b - Page B3-1392).
+        */
+       if (icache_is_pipt()) {
+               unsigned long hva = gfn_to_hva(kvm, gfn);
+               __cpuc_coherent_user_range(hva, hva + PAGE_SIZE);
+       } else if (!icache_is_vivt_asid_tagged()) {
+               /* any kind of VIPT cache */
+               __flush_icache_all();
+       }
+}
+
+#define kvm_flush_dcache_to_poc(a,l)   __cpuc_flush_dcache_area((a), (l))
+
+#endif /* !__ASSEMBLY__ */
+
 #endif /* __ARM_KVM_MMU_H__ */