399 lines
9.5 KiB
C
399 lines
9.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
|
|
*
|
|
* Authors:
|
|
* Alexander Graf <agraf@suse.de>
|
|
*/
|
|
|
|
#include <linux/kvm_host.h>
|
|
|
|
#include <asm/kvm_ppc.h>
|
|
#include <asm/kvm_book3s.h>
|
|
#include <asm/book3s/32/mmu-hash.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/hw_irq.h>
|
|
#include "book3s.h"
|
|
|
|
/* #define DEBUG_MMU */
|
|
/* #define DEBUG_SR */
|
|
|
|
#ifdef DEBUG_MMU
|
|
#define dprintk_mmu(a, ...) printk(KERN_INFO a, __VA_ARGS__)
|
|
#else
|
|
#define dprintk_mmu(a, ...) do { } while(0)
|
|
#endif
|
|
|
|
#ifdef DEBUG_SR
|
|
#define dprintk_sr(a, ...) printk(KERN_INFO a, __VA_ARGS__)
|
|
#else
|
|
#define dprintk_sr(a, ...) do { } while(0)
|
|
#endif
|
|
|
|
#if PAGE_SHIFT != 12
|
|
#error Unknown page size
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
#error XXX need to grab mmu_hash_lock
|
|
#endif
|
|
|
|
#ifdef CONFIG_PTE_64BIT
|
|
#error Only 32 bit pages are supported for now
|
|
#endif
|
|
|
|
static ulong htab;
|
|
static u32 htabmask;
|
|
|
|
void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
|
|
{
|
|
volatile u32 *pteg;
|
|
|
|
/* Remove from host HTAB */
|
|
pteg = (u32*)pte->slot;
|
|
pteg[0] = 0;
|
|
|
|
/* And make sure it's gone from the TLB too */
|
|
asm volatile ("sync");
|
|
asm volatile ("tlbie %0" : : "r" (pte->pte.eaddr) : "memory");
|
|
asm volatile ("sync");
|
|
asm volatile ("tlbsync");
|
|
}
|
|
|
|
/* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
|
|
* a hash, so we don't waste cycles on looping */
|
|
static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
|
|
{
|
|
return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
|
|
((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
|
|
((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
|
|
((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
|
|
((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
|
|
((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
|
|
((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
|
|
((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
|
|
}
|
|
|
|
|
|
static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
|
|
{
|
|
struct kvmppc_sid_map *map;
|
|
u16 sid_map_mask;
|
|
|
|
if (kvmppc_get_msr(vcpu) & MSR_PR)
|
|
gvsid |= VSID_PR;
|
|
|
|
sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
|
|
map = &to_book3s(vcpu)->sid_map[sid_map_mask];
|
|
if (map->guest_vsid == gvsid) {
|
|
dprintk_sr("SR: Searching 0x%llx -> 0x%llx\n",
|
|
gvsid, map->host_vsid);
|
|
return map;
|
|
}
|
|
|
|
map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
|
|
if (map->guest_vsid == gvsid) {
|
|
dprintk_sr("SR: Searching 0x%llx -> 0x%llx\n",
|
|
gvsid, map->host_vsid);
|
|
return map;
|
|
}
|
|
|
|
dprintk_sr("SR: Searching 0x%llx -> not found\n", gvsid);
|
|
return NULL;
|
|
}
|
|
|
|
static u32 *kvmppc_mmu_get_pteg(struct kvm_vcpu *vcpu, u32 vsid, u32 eaddr,
|
|
bool primary)
|
|
{
|
|
u32 page, hash;
|
|
ulong pteg = htab;
|
|
|
|
page = (eaddr & ~ESID_MASK) >> 12;
|
|
|
|
hash = ((vsid ^ page) << 6);
|
|
if (!primary)
|
|
hash = ~hash;
|
|
|
|
hash &= htabmask;
|
|
|
|
pteg |= hash;
|
|
|
|
dprintk_mmu("htab: %lx | hash: %x | htabmask: %x | pteg: %lx\n",
|
|
htab, hash, htabmask, pteg);
|
|
|
|
return (u32*)pteg;
|
|
}
|
|
|
|
extern char etext[];
|
|
|
|
int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte,
|
|
bool iswrite)
|
|
{
|
|
kvm_pfn_t hpaddr;
|
|
u64 vpn;
|
|
u64 vsid;
|
|
struct kvmppc_sid_map *map;
|
|
volatile u32 *pteg;
|
|
u32 eaddr = orig_pte->eaddr;
|
|
u32 pteg0, pteg1;
|
|
register int rr = 0;
|
|
bool primary = false;
|
|
bool evict = false;
|
|
struct hpte_cache *pte;
|
|
int r = 0;
|
|
bool writable;
|
|
|
|
/* Get host physical address for gpa */
|
|
hpaddr = kvmppc_gpa_to_pfn(vcpu, orig_pte->raddr, iswrite, &writable);
|
|
if (is_error_noslot_pfn(hpaddr)) {
|
|
printk(KERN_INFO "Couldn't get guest page for gpa %lx!\n",
|
|
orig_pte->raddr);
|
|
r = -EINVAL;
|
|
goto out;
|
|
}
|
|
hpaddr <<= PAGE_SHIFT;
|
|
|
|
/* and write the mapping ea -> hpa into the pt */
|
|
vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
|
|
map = find_sid_vsid(vcpu, vsid);
|
|
if (!map) {
|
|
kvmppc_mmu_map_segment(vcpu, eaddr);
|
|
map = find_sid_vsid(vcpu, vsid);
|
|
}
|
|
BUG_ON(!map);
|
|
|
|
vsid = map->host_vsid;
|
|
vpn = (vsid << (SID_SHIFT - VPN_SHIFT)) |
|
|
((eaddr & ~ESID_MASK) >> VPN_SHIFT);
|
|
next_pteg:
|
|
if (rr == 16) {
|
|
primary = !primary;
|
|
evict = true;
|
|
rr = 0;
|
|
}
|
|
|
|
pteg = kvmppc_mmu_get_pteg(vcpu, vsid, eaddr, primary);
|
|
|
|
/* not evicting yet */
|
|
if (!evict && (pteg[rr] & PTE_V)) {
|
|
rr += 2;
|
|
goto next_pteg;
|
|
}
|
|
|
|
dprintk_mmu("KVM: old PTEG: %p (%d)\n", pteg, rr);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[0], pteg[1]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[2], pteg[3]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[4], pteg[5]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[6], pteg[7]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[8], pteg[9]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[10], pteg[11]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[12], pteg[13]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[14], pteg[15]);
|
|
|
|
pteg0 = ((eaddr & 0x0fffffff) >> 22) | (vsid << 7) | PTE_V |
|
|
(primary ? 0 : PTE_SEC);
|
|
pteg1 = hpaddr | PTE_M | PTE_R | PTE_C;
|
|
|
|
if (orig_pte->may_write && writable) {
|
|
pteg1 |= PP_RWRW;
|
|
mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
|
|
} else {
|
|
pteg1 |= PP_RWRX;
|
|
}
|
|
|
|
if (orig_pte->may_execute)
|
|
kvmppc_mmu_flush_icache(hpaddr >> PAGE_SHIFT);
|
|
|
|
local_irq_disable();
|
|
|
|
if (pteg[rr]) {
|
|
pteg[rr] = 0;
|
|
asm volatile ("sync");
|
|
}
|
|
pteg[rr + 1] = pteg1;
|
|
pteg[rr] = pteg0;
|
|
asm volatile ("sync");
|
|
|
|
local_irq_enable();
|
|
|
|
dprintk_mmu("KVM: new PTEG: %p\n", pteg);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[0], pteg[1]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[2], pteg[3]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[4], pteg[5]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[6], pteg[7]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[8], pteg[9]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[10], pteg[11]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[12], pteg[13]);
|
|
dprintk_mmu("KVM: %08x - %08x\n", pteg[14], pteg[15]);
|
|
|
|
|
|
/* Now tell our Shadow PTE code about the new page */
|
|
|
|
pte = kvmppc_mmu_hpte_cache_next(vcpu);
|
|
if (!pte) {
|
|
kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT);
|
|
r = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
dprintk_mmu("KVM: %c%c Map 0x%llx: [%lx] 0x%llx (0x%llx) -> %lx\n",
|
|
orig_pte->may_write ? 'w' : '-',
|
|
orig_pte->may_execute ? 'x' : '-',
|
|
orig_pte->eaddr, (ulong)pteg, vpn,
|
|
orig_pte->vpage, hpaddr);
|
|
|
|
pte->slot = (ulong)&pteg[rr];
|
|
pte->host_vpn = vpn;
|
|
pte->pte = *orig_pte;
|
|
pte->pfn = hpaddr >> PAGE_SHIFT;
|
|
|
|
kvmppc_mmu_hpte_cache_map(vcpu, pte);
|
|
|
|
kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT);
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
|
|
{
|
|
kvmppc_mmu_pte_vflush(vcpu, pte->vpage, 0xfffffffffULL);
|
|
}
|
|
|
|
static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
|
|
{
|
|
struct kvmppc_sid_map *map;
|
|
struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
|
|
u16 sid_map_mask;
|
|
static int backwards_map = 0;
|
|
|
|
if (kvmppc_get_msr(vcpu) & MSR_PR)
|
|
gvsid |= VSID_PR;
|
|
|
|
/* We might get collisions that trap in preceding order, so let's
|
|
map them differently */
|
|
|
|
sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
|
|
if (backwards_map)
|
|
sid_map_mask = SID_MAP_MASK - sid_map_mask;
|
|
|
|
map = &to_book3s(vcpu)->sid_map[sid_map_mask];
|
|
|
|
/* Make sure we're taking the other map next time */
|
|
backwards_map = !backwards_map;
|
|
|
|
/* Uh-oh ... out of mappings. Let's flush! */
|
|
if (vcpu_book3s->vsid_next >= VSID_POOL_SIZE) {
|
|
vcpu_book3s->vsid_next = 0;
|
|
memset(vcpu_book3s->sid_map, 0,
|
|
sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
|
|
kvmppc_mmu_pte_flush(vcpu, 0, 0);
|
|
kvmppc_mmu_flush_segments(vcpu);
|
|
}
|
|
map->host_vsid = vcpu_book3s->vsid_pool[vcpu_book3s->vsid_next];
|
|
vcpu_book3s->vsid_next++;
|
|
|
|
map->guest_vsid = gvsid;
|
|
map->valid = true;
|
|
|
|
return map;
|
|
}
|
|
|
|
int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
|
|
{
|
|
u32 esid = eaddr >> SID_SHIFT;
|
|
u64 gvsid;
|
|
u32 sr;
|
|
struct kvmppc_sid_map *map;
|
|
struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
|
|
int r = 0;
|
|
|
|
if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
|
|
/* Invalidate an entry */
|
|
svcpu->sr[esid] = SR_INVALID;
|
|
r = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
map = find_sid_vsid(vcpu, gvsid);
|
|
if (!map)
|
|
map = create_sid_map(vcpu, gvsid);
|
|
|
|
map->guest_esid = esid;
|
|
sr = map->host_vsid | SR_KP;
|
|
svcpu->sr[esid] = sr;
|
|
|
|
dprintk_sr("MMU: mtsr %d, 0x%x\n", esid, sr);
|
|
|
|
out:
|
|
svcpu_put(svcpu);
|
|
return r;
|
|
}
|
|
|
|
void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
|
|
{
|
|
int i;
|
|
struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
|
|
|
|
dprintk_sr("MMU: flushing all segments (%d)\n", ARRAY_SIZE(svcpu->sr));
|
|
for (i = 0; i < ARRAY_SIZE(svcpu->sr); i++)
|
|
svcpu->sr[i] = SR_INVALID;
|
|
|
|
svcpu_put(svcpu);
|
|
}
|
|
|
|
void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
|
|
{
|
|
int i;
|
|
|
|
kvmppc_mmu_hpte_destroy(vcpu);
|
|
preempt_disable();
|
|
for (i = 0; i < SID_CONTEXTS; i++)
|
|
__destroy_context(to_book3s(vcpu)->context_id[i]);
|
|
preempt_enable();
|
|
}
|
|
|
|
/* From mm/mmu_context_hash32.c */
|
|
#define CTX_TO_VSID(c, id) ((((c) * (897 * 16)) + (id * 0x111)) & 0xffffff)
|
|
|
|
int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
|
|
int err;
|
|
ulong sdr1;
|
|
int i;
|
|
int j;
|
|
|
|
for (i = 0; i < SID_CONTEXTS; i++) {
|
|
err = __init_new_context();
|
|
if (err < 0)
|
|
goto init_fail;
|
|
vcpu3s->context_id[i] = err;
|
|
|
|
/* Remember context id for this combination */
|
|
for (j = 0; j < 16; j++)
|
|
vcpu3s->vsid_pool[(i * 16) + j] = CTX_TO_VSID(err, j);
|
|
}
|
|
|
|
vcpu3s->vsid_next = 0;
|
|
|
|
/* Remember where the HTAB is */
|
|
asm ( "mfsdr1 %0" : "=r"(sdr1) );
|
|
htabmask = ((sdr1 & 0x1FF) << 16) | 0xFFC0;
|
|
htab = (ulong)__va(sdr1 & 0xffff0000);
|
|
|
|
kvmppc_mmu_hpte_init(vcpu);
|
|
|
|
return 0;
|
|
|
|
init_fail:
|
|
for (j = 0; j < i; j++) {
|
|
if (!vcpu3s->context_id[j])
|
|
continue;
|
|
|
|
__destroy_context(to_book3s(vcpu)->context_id[j]);
|
|
}
|
|
|
|
return -1;
|
|
}
|