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/*
* Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
*
* Authors:
* Alexander Graf <agraf@suse.de>
*
* 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.
*/
#include <linux/kvm_host.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu-hash32.h>
#include <asm/machdep.h>
#include <asm/mmu_context.h>
#include <asm/hw_irq.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)
{
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[
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