mirror of https://gitee.com/openkylin/linux.git
403 lines
10 KiB
C
403 lines
10 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Copyright SUSE Linux Products GmbH 2010
|
|
*
|
|
* Authors: Alexander Graf <agraf@suse.de>
|
|
*/
|
|
|
|
#ifndef __ASM_KVM_BOOK3S_64_H__
|
|
#define __ASM_KVM_BOOK3S_64_H__
|
|
|
|
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
|
|
static inline struct kvmppc_book3s_shadow_vcpu *svcpu_get(struct kvm_vcpu *vcpu)
|
|
{
|
|
preempt_disable();
|
|
return &get_paca()->shadow_vcpu;
|
|
}
|
|
|
|
static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu)
|
|
{
|
|
preempt_enable();
|
|
}
|
|
#endif
|
|
|
|
#define SPAPR_TCE_SHIFT 12
|
|
|
|
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
|
|
#define KVM_DEFAULT_HPT_ORDER 24 /* 16MB HPT by default */
|
|
extern unsigned long kvm_rma_pages;
|
|
#endif
|
|
|
|
#define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */
|
|
|
|
/*
|
|
* We use a lock bit in HPTE dword 0 to synchronize updates and
|
|
* accesses to each HPTE, and another bit to indicate non-present
|
|
* HPTEs.
|
|
*/
|
|
#define HPTE_V_HVLOCK 0x40UL
|
|
#define HPTE_V_ABSENT 0x20UL
|
|
|
|
/*
|
|
* We use this bit in the guest_rpte field of the revmap entry
|
|
* to indicate a modified HPTE.
|
|
*/
|
|
#define HPTE_GR_MODIFIED (1ul << 62)
|
|
|
|
/* These bits are reserved in the guest view of the HPTE */
|
|
#define HPTE_GR_RESERVED HPTE_GR_MODIFIED
|
|
|
|
static inline long try_lock_hpte(unsigned long *hpte, unsigned long bits)
|
|
{
|
|
unsigned long tmp, old;
|
|
|
|
asm volatile(" ldarx %0,0,%2\n"
|
|
" and. %1,%0,%3\n"
|
|
" bne 2f\n"
|
|
" ori %0,%0,%4\n"
|
|
" stdcx. %0,0,%2\n"
|
|
" beq+ 2f\n"
|
|
" mr %1,%3\n"
|
|
"2: isync"
|
|
: "=&r" (tmp), "=&r" (old)
|
|
: "r" (hpte), "r" (bits), "i" (HPTE_V_HVLOCK)
|
|
: "cc", "memory");
|
|
return old == 0;
|
|
}
|
|
|
|
static inline int __hpte_actual_psize(unsigned int lp, int psize)
|
|
{
|
|
int i, shift;
|
|
unsigned int mask;
|
|
|
|
/* start from 1 ignoring MMU_PAGE_4K */
|
|
for (i = 1; i < MMU_PAGE_COUNT; i++) {
|
|
|
|
/* invalid penc */
|
|
if (mmu_psize_defs[psize].penc[i] == -1)
|
|
continue;
|
|
/*
|
|
* encoding bits per actual page size
|
|
* PTE LP actual page size
|
|
* rrrr rrrz >=8KB
|
|
* rrrr rrzz >=16KB
|
|
* rrrr rzzz >=32KB
|
|
* rrrr zzzz >=64KB
|
|
* .......
|
|
*/
|
|
shift = mmu_psize_defs[i].shift - LP_SHIFT;
|
|
if (shift > LP_BITS)
|
|
shift = LP_BITS;
|
|
mask = (1 << shift) - 1;
|
|
if ((lp & mask) == mmu_psize_defs[psize].penc[i])
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static inline unsigned long compute_tlbie_rb(unsigned long v, unsigned long r,
|
|
unsigned long pte_index)
|
|
{
|
|
int b_psize = MMU_PAGE_4K, a_psize = MMU_PAGE_4K;
|
|
unsigned int penc;
|
|
unsigned long rb = 0, va_low, sllp;
|
|
unsigned int lp = (r >> LP_SHIFT) & ((1 << LP_BITS) - 1);
|
|
|
|
if (v & HPTE_V_LARGE) {
|
|
for (b_psize = 0; b_psize < MMU_PAGE_COUNT; b_psize++) {
|
|
|
|
/* valid entries have a shift value */
|
|
if (!mmu_psize_defs[b_psize].shift)
|
|
continue;
|
|
|
|
a_psize = __hpte_actual_psize(lp, b_psize);
|
|
if (a_psize != -1)
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* Ignore the top 14 bits of va
|
|
* v have top two bits covering segment size, hence move
|
|
* by 16 bits, Also clear the lower HPTE_V_AVPN_SHIFT (7) bits.
|
|
* AVA field in v also have the lower 23 bits ignored.
|
|
* For base page size 4K we need 14 .. 65 bits (so need to
|
|
* collect extra 11 bits)
|
|
* For others we need 14..14+i
|
|
*/
|
|
/* This covers 14..54 bits of va*/
|
|
rb = (v & ~0x7fUL) << 16; /* AVA field */
|
|
/*
|
|
* AVA in v had cleared lower 23 bits. We need to derive
|
|
* that from pteg index
|
|
*/
|
|
va_low = pte_index >> 3;
|
|
if (v & HPTE_V_SECONDARY)
|
|
va_low = ~va_low;
|
|
/*
|
|
* get the vpn bits from va_low using reverse of hashing.
|
|
* In v we have va with 23 bits dropped and then left shifted
|
|
* HPTE_V_AVPN_SHIFT (7) bits. Now to find vsid we need
|
|
* right shift it with (SID_SHIFT - (23 - 7))
|
|
*/
|
|
if (!(v & HPTE_V_1TB_SEG))
|
|
va_low ^= v >> (SID_SHIFT - 16);
|
|
else
|
|
va_low ^= v >> (SID_SHIFT_1T - 16);
|
|
va_low &= 0x7ff;
|
|
|
|
switch (b_psize) {
|
|
case MMU_PAGE_4K:
|
|
sllp = ((mmu_psize_defs[a_psize].sllp & SLB_VSID_L) >> 6) |
|
|
((mmu_psize_defs[a_psize].sllp & SLB_VSID_LP) >> 4);
|
|
rb |= sllp << 5; /* AP field */
|
|
rb |= (va_low & 0x7ff) << 12; /* remaining 11 bits of AVA */
|
|
break;
|
|
default:
|
|
{
|
|
int aval_shift;
|
|
/*
|
|
* remaining 7bits of AVA/LP fields
|
|
* Also contain the rr bits of LP
|
|
*/
|
|
rb |= (va_low & 0x7f) << 16;
|
|
/*
|
|
* Now clear not needed LP bits based on actual psize
|
|
*/
|
|
rb &= ~((1ul << mmu_psize_defs[a_psize].shift) - 1);
|
|
/*
|
|
* AVAL field 58..77 - base_page_shift bits of va
|
|
* we have space for 58..64 bits, Missing bits should
|
|
* be zero filled. +1 is to take care of L bit shift
|
|
*/
|
|
aval_shift = 64 - (77 - mmu_psize_defs[b_psize].shift) + 1;
|
|
rb |= ((va_low << aval_shift) & 0xfe);
|
|
|
|
rb |= 1; /* L field */
|
|
penc = mmu_psize_defs[b_psize].penc[a_psize];
|
|
rb |= penc << 12; /* LP field */
|
|
break;
|
|
}
|
|
}
|
|
rb |= (v >> 54) & 0x300; /* B field */
|
|
return rb;
|
|
}
|
|
|
|
static inline unsigned long hpte_page_size(unsigned long h, unsigned long l)
|
|
{
|
|
int size, a_psize;
|
|
/* Look at the 8 bit LP value */
|
|
unsigned int lp = (l >> LP_SHIFT) & ((1 << LP_BITS) - 1);
|
|
|
|
/* only handle 4k, 64k and 16M pages for now */
|
|
if (!(h & HPTE_V_LARGE))
|
|
return 1ul << 12;
|
|
else {
|
|
for (size = 0; size < MMU_PAGE_COUNT; size++) {
|
|
/* valid entries have a shift value */
|
|
if (!mmu_psize_defs[size].shift)
|
|
continue;
|
|
|
|
a_psize = __hpte_actual_psize(lp, size);
|
|
if (a_psize != -1)
|
|
return 1ul << mmu_psize_defs[a_psize].shift;
|
|
}
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned long hpte_rpn(unsigned long ptel, unsigned long psize)
|
|
{
|
|
return ((ptel & HPTE_R_RPN) & ~(psize - 1)) >> PAGE_SHIFT;
|
|
}
|
|
|
|
static inline int hpte_is_writable(unsigned long ptel)
|
|
{
|
|
unsigned long pp = ptel & (HPTE_R_PP0 | HPTE_R_PP);
|
|
|
|
return pp != PP_RXRX && pp != PP_RXXX;
|
|
}
|
|
|
|
static inline unsigned long hpte_make_readonly(unsigned long ptel)
|
|
{
|
|
if ((ptel & HPTE_R_PP0) || (ptel & HPTE_R_PP) == PP_RWXX)
|
|
ptel = (ptel & ~HPTE_R_PP) | PP_RXXX;
|
|
else
|
|
ptel |= PP_RXRX;
|
|
return ptel;
|
|
}
|
|
|
|
static inline int hpte_cache_flags_ok(unsigned long ptel, unsigned long io_type)
|
|
{
|
|
unsigned int wimg = ptel & HPTE_R_WIMG;
|
|
|
|
/* Handle SAO */
|
|
if (wimg == (HPTE_R_W | HPTE_R_I | HPTE_R_M) &&
|
|
cpu_has_feature(CPU_FTR_ARCH_206))
|
|
wimg = HPTE_R_M;
|
|
|
|
if (!io_type)
|
|
return wimg == HPTE_R_M;
|
|
|
|
return (wimg & (HPTE_R_W | HPTE_R_I)) == io_type;
|
|
}
|
|
|
|
/*
|
|
* If it's present and writable, atomically set dirty and referenced bits and
|
|
* return the PTE, otherwise return 0. If we find a transparent hugepage
|
|
* and if it is marked splitting we return 0;
|
|
*/
|
|
static inline pte_t kvmppc_read_update_linux_pte(pte_t *ptep, int writing,
|
|
unsigned int hugepage)
|
|
{
|
|
pte_t old_pte, new_pte = __pte(0);
|
|
|
|
while (1) {
|
|
old_pte = pte_val(*ptep);
|
|
/*
|
|
* wait until _PAGE_BUSY is clear then set it atomically
|
|
*/
|
|
if (unlikely(old_pte & _PAGE_BUSY)) {
|
|
cpu_relax();
|
|
continue;
|
|
}
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
/* If hugepage and is trans splitting return None */
|
|
if (unlikely(hugepage &&
|
|
pmd_trans_splitting(pte_pmd(old_pte))))
|
|
return __pte(0);
|
|
#endif
|
|
/* If pte is not present return None */
|
|
if (unlikely(!(old_pte & _PAGE_PRESENT)))
|
|
return __pte(0);
|
|
|
|
new_pte = pte_mkyoung(old_pte);
|
|
if (writing && pte_write(old_pte))
|
|
new_pte = pte_mkdirty(new_pte);
|
|
|
|
if (old_pte == __cmpxchg_u64((unsigned long *)ptep, old_pte,
|
|
new_pte))
|
|
break;
|
|
}
|
|
return new_pte;
|
|
}
|
|
|
|
|
|
/* Return HPTE cache control bits corresponding to Linux pte bits */
|
|
static inline unsigned long hpte_cache_bits(unsigned long pte_val)
|
|
{
|
|
#if _PAGE_NO_CACHE == HPTE_R_I && _PAGE_WRITETHRU == HPTE_R_W
|
|
return pte_val & (HPTE_R_W | HPTE_R_I);
|
|
#else
|
|
return ((pte_val & _PAGE_NO_CACHE) ? HPTE_R_I : 0) +
|
|
((pte_val & _PAGE_WRITETHRU) ? HPTE_R_W : 0);
|
|
#endif
|
|
}
|
|
|
|
static inline bool hpte_read_permission(unsigned long pp, unsigned long key)
|
|
{
|
|
if (key)
|
|
return PP_RWRX <= pp && pp <= PP_RXRX;
|
|
return 1;
|
|
}
|
|
|
|
static inline bool hpte_write_permission(unsigned long pp, unsigned long key)
|
|
{
|
|
if (key)
|
|
return pp == PP_RWRW;
|
|
return pp <= PP_RWRW;
|
|
}
|
|
|
|
static inline int hpte_get_skey_perm(unsigned long hpte_r, unsigned long amr)
|
|
{
|
|
unsigned long skey;
|
|
|
|
skey = ((hpte_r & HPTE_R_KEY_HI) >> 57) |
|
|
((hpte_r & HPTE_R_KEY_LO) >> 9);
|
|
return (amr >> (62 - 2 * skey)) & 3;
|
|
}
|
|
|
|
static inline void lock_rmap(unsigned long *rmap)
|
|
{
|
|
do {
|
|
while (test_bit(KVMPPC_RMAP_LOCK_BIT, rmap))
|
|
cpu_relax();
|
|
} while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmap));
|
|
}
|
|
|
|
static inline void unlock_rmap(unsigned long *rmap)
|
|
{
|
|
__clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmap);
|
|
}
|
|
|
|
static inline bool slot_is_aligned(struct kvm_memory_slot *memslot,
|
|
unsigned long pagesize)
|
|
{
|
|
unsigned long mask = (pagesize >> PAGE_SHIFT) - 1;
|
|
|
|
if (pagesize <= PAGE_SIZE)
|
|
return 1;
|
|
return !(memslot->base_gfn & mask) && !(memslot->npages & mask);
|
|
}
|
|
|
|
/*
|
|
* This works for 4k, 64k and 16M pages on POWER7,
|
|
* and 4k and 16M pages on PPC970.
|
|
*/
|
|
static inline unsigned long slb_pgsize_encoding(unsigned long psize)
|
|
{
|
|
unsigned long senc = 0;
|
|
|
|
if (psize > 0x1000) {
|
|
senc = SLB_VSID_L;
|
|
if (psize == 0x10000)
|
|
senc |= SLB_VSID_LP_01;
|
|
}
|
|
return senc;
|
|
}
|
|
|
|
static inline int is_vrma_hpte(unsigned long hpte_v)
|
|
{
|
|
return (hpte_v & ~0xffffffUL) ==
|
|
(HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)));
|
|
}
|
|
|
|
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
|
|
/*
|
|
* Note modification of an HPTE; set the HPTE modified bit
|
|
* if anyone is interested.
|
|
*/
|
|
static inline void note_hpte_modification(struct kvm *kvm,
|
|
struct revmap_entry *rev)
|
|
{
|
|
if (atomic_read(&kvm->arch.hpte_mod_interest))
|
|
rev->guest_rpte |= HPTE_GR_MODIFIED;
|
|
}
|
|
|
|
/*
|
|
* Like kvm_memslots(), but for use in real mode when we can't do
|
|
* any RCU stuff (since the secondary threads are offline from the
|
|
* kernel's point of view), and we can't print anything.
|
|
* Thus we use rcu_dereference_raw() rather than rcu_dereference_check().
|
|
*/
|
|
static inline struct kvm_memslots *kvm_memslots_raw(struct kvm *kvm)
|
|
{
|
|
return rcu_dereference_raw_notrace(kvm->memslots);
|
|
}
|
|
|
|
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
|
|
|
|
#endif /* __ASM_KVM_BOOK3S_64_H__ */
|