252 lines
7.2 KiB
C
252 lines
7.2 KiB
C
/*
|
|
* Copyright (C) 2012,2013 - ARM Ltd
|
|
* Author: Marc Zyngier <marc.zyngier@arm.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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef __ARM64_KVM_MMU_H__
|
|
#define __ARM64_KVM_MMU_H__
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/memory.h>
|
|
|
|
/*
|
|
* As we only have the TTBR0_EL2 register, we cannot express
|
|
* "negative" addresses. This makes it impossible to directly share
|
|
* mappings with the kernel.
|
|
*
|
|
* Instead, give the HYP mode its own VA region at a fixed offset from
|
|
* the kernel by just masking the top bits (which are all ones for a
|
|
* kernel address).
|
|
*/
|
|
#define HYP_PAGE_OFFSET_SHIFT VA_BITS
|
|
#define HYP_PAGE_OFFSET_MASK ((UL(1) << HYP_PAGE_OFFSET_SHIFT) - 1)
|
|
#define HYP_PAGE_OFFSET (PAGE_OFFSET & HYP_PAGE_OFFSET_MASK)
|
|
|
|
/*
|
|
* Our virtual mapping for the idmap-ed MMU-enable code. Must be
|
|
* shared across all the page-tables. Conveniently, we use the last
|
|
* possible page, where no kernel mapping will ever exist.
|
|
*/
|
|
#define TRAMPOLINE_VA (HYP_PAGE_OFFSET_MASK & PAGE_MASK)
|
|
|
|
/*
|
|
* KVM_MMU_CACHE_MIN_PAGES is the number of stage2 page table translation
|
|
* levels in addition to the PGD and potentially the PUD which are
|
|
* pre-allocated (we pre-allocate the fake PGD and the PUD when the Stage-2
|
|
* tables use one level of tables less than the kernel.
|
|
*/
|
|
#ifdef CONFIG_ARM64_64K_PAGES
|
|
#define KVM_MMU_CACHE_MIN_PAGES 1
|
|
#else
|
|
#define KVM_MMU_CACHE_MIN_PAGES 2
|
|
#endif
|
|
|
|
#ifdef __ASSEMBLY__
|
|
|
|
/*
|
|
* Convert a kernel VA into a HYP VA.
|
|
* reg: VA to be converted.
|
|
*/
|
|
.macro kern_hyp_va reg
|
|
and \reg, \reg, #HYP_PAGE_OFFSET_MASK
|
|
.endm
|
|
|
|
#else
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/cachetype.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
#define KERN_TO_HYP(kva) ((unsigned long)kva - PAGE_OFFSET + HYP_PAGE_OFFSET)
|
|
|
|
/*
|
|
* We currently only support a 40bit IPA.
|
|
*/
|
|
#define KVM_PHYS_SHIFT (40)
|
|
#define KVM_PHYS_SIZE (1UL << KVM_PHYS_SHIFT)
|
|
#define KVM_PHYS_MASK (KVM_PHYS_SIZE - 1UL)
|
|
|
|
int create_hyp_mappings(void *from, void *to);
|
|
int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
|
|
void free_boot_hyp_pgd(void);
|
|
void free_hyp_pgds(void);
|
|
|
|
void stage2_unmap_vm(struct kvm *kvm);
|
|
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, bool writable);
|
|
|
|
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);
|
|
|
|
#define kvm_set_pte(ptep, pte) set_pte(ptep, pte)
|
|
#define kvm_set_pmd(pmdp, pmd) set_pmd(pmdp, pmd)
|
|
|
|
static inline void kvm_clean_pgd(pgd_t *pgd) {}
|
|
static inline void kvm_clean_pmd(pmd_t *pmd) {}
|
|
static inline void kvm_clean_pmd_entry(pmd_t *pmd) {}
|
|
static inline void kvm_clean_pte(pte_t *pte) {}
|
|
static inline void kvm_clean_pte_entry(pte_t *pte) {}
|
|
|
|
static inline void kvm_set_s2pte_writable(pte_t *pte)
|
|
{
|
|
pte_val(*pte) |= PTE_S2_RDWR;
|
|
}
|
|
|
|
static inline void kvm_set_s2pmd_writable(pmd_t *pmd)
|
|
{
|
|
pmd_val(*pmd) |= PMD_S2_RDWR;
|
|
}
|
|
|
|
#define kvm_pgd_addr_end(addr, end) pgd_addr_end(addr, end)
|
|
#define kvm_pud_addr_end(addr, end) pud_addr_end(addr, end)
|
|
#define kvm_pmd_addr_end(addr, end) pmd_addr_end(addr, end)
|
|
|
|
/*
|
|
* In the case where PGDIR_SHIFT is larger than KVM_PHYS_SHIFT, we can address
|
|
* the entire IPA input range with a single pgd entry, and we would only need
|
|
* one pgd entry. Note that in this case, the pgd is actually not used by
|
|
* the MMU for Stage-2 translations, but is merely a fake pgd used as a data
|
|
* structure for the kernel pgtable macros to work.
|
|
*/
|
|
#if PGDIR_SHIFT > KVM_PHYS_SHIFT
|
|
#define PTRS_PER_S2_PGD_SHIFT 0
|
|
#else
|
|
#define PTRS_PER_S2_PGD_SHIFT (KVM_PHYS_SHIFT - PGDIR_SHIFT)
|
|
#endif
|
|
#define PTRS_PER_S2_PGD (1 << PTRS_PER_S2_PGD_SHIFT)
|
|
#define S2_PGD_ORDER get_order(PTRS_PER_S2_PGD * sizeof(pgd_t))
|
|
|
|
#define kvm_pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_S2_PGD - 1))
|
|
|
|
/*
|
|
* If we are concatenating first level stage-2 page tables, we would have less
|
|
* than or equal to 16 pointers in the fake PGD, because that's what the
|
|
* architecture allows. In this case, (4 - CONFIG_PGTABLE_LEVELS)
|
|
* represents the first level for the host, and we add 1 to go to the next
|
|
* level (which uses contatenation) for the stage-2 tables.
|
|
*/
|
|
#if PTRS_PER_S2_PGD <= 16
|
|
#define KVM_PREALLOC_LEVEL (4 - CONFIG_PGTABLE_LEVELS + 1)
|
|
#else
|
|
#define KVM_PREALLOC_LEVEL (0)
|
|
#endif
|
|
|
|
static inline void *kvm_get_hwpgd(struct kvm *kvm)
|
|
{
|
|
pgd_t *pgd = kvm->arch.pgd;
|
|
pud_t *pud;
|
|
|
|
if (KVM_PREALLOC_LEVEL == 0)
|
|
return pgd;
|
|
|
|
pud = pud_offset(pgd, 0);
|
|
if (KVM_PREALLOC_LEVEL == 1)
|
|
return pud;
|
|
|
|
BUG_ON(KVM_PREALLOC_LEVEL != 2);
|
|
return pmd_offset(pud, 0);
|
|
}
|
|
|
|
static inline unsigned int kvm_get_hwpgd_size(void)
|
|
{
|
|
if (KVM_PREALLOC_LEVEL > 0)
|
|
return PTRS_PER_S2_PGD * PAGE_SIZE;
|
|
return PTRS_PER_S2_PGD * sizeof(pgd_t);
|
|
}
|
|
|
|
static inline bool kvm_page_empty(void *ptr)
|
|
{
|
|
struct page *ptr_page = virt_to_page(ptr);
|
|
return page_count(ptr_page) == 1;
|
|
}
|
|
|
|
#define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep)
|
|
|
|
#ifdef __PAGETABLE_PMD_FOLDED
|
|
#define kvm_pmd_table_empty(kvm, pmdp) (0)
|
|
#else
|
|
#define kvm_pmd_table_empty(kvm, pmdp) \
|
|
(kvm_page_empty(pmdp) && (!(kvm) || KVM_PREALLOC_LEVEL < 2))
|
|
#endif
|
|
|
|
#ifdef __PAGETABLE_PUD_FOLDED
|
|
#define kvm_pud_table_empty(kvm, pudp) (0)
|
|
#else
|
|
#define kvm_pud_table_empty(kvm, pudp) \
|
|
(kvm_page_empty(pudp) && (!(kvm) || KVM_PREALLOC_LEVEL < 1))
|
|
#endif
|
|
|
|
|
|
struct kvm;
|
|
|
|
#define kvm_flush_dcache_to_poc(a,l) __flush_dcache_area((a), (l))
|
|
|
|
static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
|
|
{
|
|
return (vcpu_sys_reg(vcpu, SCTLR_EL1) & 0b101) == 0b101;
|
|
}
|
|
|
|
static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu, pfn_t pfn,
|
|
unsigned long size,
|
|
bool ipa_uncached)
|
|
{
|
|
void *va = page_address(pfn_to_page(pfn));
|
|
|
|
if (!vcpu_has_cache_enabled(vcpu) || ipa_uncached)
|
|
kvm_flush_dcache_to_poc(va, size);
|
|
|
|
if (!icache_is_aliasing()) { /* PIPT */
|
|
flush_icache_range((unsigned long)va,
|
|
(unsigned long)va + size);
|
|
} else if (!icache_is_aivivt()) { /* non ASID-tagged VIVT */
|
|
/* any kind of VIPT cache */
|
|
__flush_icache_all();
|
|
}
|
|
}
|
|
|
|
static inline void __kvm_flush_dcache_pte(pte_t pte)
|
|
{
|
|
struct page *page = pte_page(pte);
|
|
kvm_flush_dcache_to_poc(page_address(page), PAGE_SIZE);
|
|
}
|
|
|
|
static inline void __kvm_flush_dcache_pmd(pmd_t pmd)
|
|
{
|
|
struct page *page = pmd_page(pmd);
|
|
kvm_flush_dcache_to_poc(page_address(page), PMD_SIZE);
|
|
}
|
|
|
|
static inline void __kvm_flush_dcache_pud(pud_t pud)
|
|
{
|
|
struct page *page = pud_page(pud);
|
|
kvm_flush_dcache_to_poc(page_address(page), PUD_SIZE);
|
|
}
|
|
|
|
#define kvm_virt_to_phys(x) __virt_to_phys((unsigned long)(x))
|
|
|
|
void stage2_flush_vm(struct kvm *kvm);
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* __ARM64_KVM_MMU_H__ */
|