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/*
* Copyright (C) 2012 - Virtual Open Systems and Columbia University
* Author: Christoffer Dall <c.dall@virtualopensystems.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __ARM_KVM_MMU_H__
#define __ARM_KVM_MMU_H__
#include <asm/cacheflush.h>
#include <asm/pgalloc.h>
#include <asm/idmap.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 (~0UL)
#define HYP_PAGE_OFFSET PAGE_OFFSET
#define KERN_TO_HYP(kva) (kva)
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);
int kvm_alloc_stage2_pgd(struct kvm *kvm);
void kvm_free_stage2_pgd(struct kvm *kvm);
int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
phys_addr_t pa, unsigned long size);
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);
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;
if (hsr_ec == HSR_EC_IABT)
return false;
else if ((hsr & HSR_ISV) && !(hsr & HSR_WNR))
return false;
else
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();
}
}
#endif /* __ARM_KVM_MMU_H__ */
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