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Diffstat (limited to 'arch/powerpc/kvm/book3s_32_mmu.c')
-rw-r--r--arch/powerpc/kvm/book3s_32_mmu.c430
1 files changed, 430 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c
new file mode 100644
index 000000000..612169988
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_32_mmu.c
@@ -0,0 +1,430 @@
+/*
+ * 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 2009
+ *
+ * Authors: Alexander Graf <agraf@suse.de>
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/highmem.h>
+
+#include <asm/kvm_ppc.h>
+#include <asm/kvm_book3s.h>
+
+/* #define DEBUG_MMU */
+/* #define DEBUG_MMU_PTE */
+/* #define DEBUG_MMU_PTE_IP 0xfff14c40 */
+
+#ifdef DEBUG_MMU
+#define dprintk(X...) printk(KERN_INFO X)
+#else
+#define dprintk(X...) do { } while(0)
+#endif
+
+#ifdef DEBUG_MMU_PTE
+#define dprintk_pte(X...) printk(KERN_INFO X)
+#else
+#define dprintk_pte(X...) do { } while(0)
+#endif
+
+#define PTEG_FLAG_ACCESSED 0x00000100
+#define PTEG_FLAG_DIRTY 0x00000080
+#ifndef SID_SHIFT
+#define SID_SHIFT 28
+#endif
+
+static inline bool check_debug_ip(struct kvm_vcpu *vcpu)
+{
+#ifdef DEBUG_MMU_PTE_IP
+ return vcpu->arch.regs.nip == DEBUG_MMU_PTE_IP;
+#else
+ return true;
+#endif
+}
+
+static inline u32 sr_vsid(u32 sr_raw)
+{
+ return sr_raw & 0x0fffffff;
+}
+
+static inline bool sr_valid(u32 sr_raw)
+{
+ return (sr_raw & 0x80000000) ? false : true;
+}
+
+static inline bool sr_ks(u32 sr_raw)
+{
+ return (sr_raw & 0x40000000) ? true: false;
+}
+
+static inline bool sr_kp(u32 sr_raw)
+{
+ return (sr_raw & 0x20000000) ? true: false;
+}
+
+static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
+ struct kvmppc_pte *pte, bool data,
+ bool iswrite);
+static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
+ u64 *vsid);
+
+static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr)
+{
+ return kvmppc_get_sr(vcpu, (eaddr >> 28) & 0xf);
+}
+
+static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
+ bool data)
+{
+ u64 vsid;
+ struct kvmppc_pte pte;
+
+ if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data, false))
+ return pte.vpage;
+
+ kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
+ return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16);
+}
+
+static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu)
+{
+ kvmppc_set_msr(vcpu, 0);
+}
+
+static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu,
+ u32 sre, gva_t eaddr,
+ bool primary)
+{
+ struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
+ u32 page, hash, pteg, htabmask;
+ hva_t r;
+
+ page = (eaddr & 0x0FFFFFFF) >> 12;
+ htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0;
+
+ hash = ((sr_vsid(sre) ^ page) << 6);
+ if (!primary)
+ hash = ~hash;
+ hash &= htabmask;
+
+ pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash;
+
+ dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n",
+ kvmppc_get_pc(vcpu), eaddr, vcpu_book3s->sdr1, pteg,
+ sr_vsid(sre));
+
+ r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT);
+ if (kvm_is_error_hva(r))
+ return r;
+ return r | (pteg & ~PAGE_MASK);
+}
+
+static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary)
+{
+ return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 7) |
+ (primary ? 0 : 0x40) | 0x80000000;
+}
+
+static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
+ struct kvmppc_pte *pte, bool data,
+ bool iswrite)
+{
+ struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
+ struct kvmppc_bat *bat;
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ if (data)
+ bat = &vcpu_book3s->dbat[i];
+ else
+ bat = &vcpu_book3s->ibat[i];
+
+ if (kvmppc_get_msr(vcpu) & MSR_PR) {
+ if (!bat->vp)
+ continue;
+ } else {
+ if (!bat->vs)
+ continue;
+ }
+
+ if (check_debug_ip(vcpu))
+ {
+ dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n",
+ data ? 'd' : 'i', i, eaddr, bat->bepi,
+ bat->bepi_mask);
+ }
+ if ((eaddr & bat->bepi_mask) == bat->bepi) {
+ u64 vsid;
+ kvmppc_mmu_book3s_32_esid_to_vsid(vcpu,
+ eaddr >> SID_SHIFT, &vsid);
+ vsid <<= 16;
+ pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid;
+
+ pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask);
+ pte->may_read = bat->pp;
+ pte->may_write = bat->pp > 1;
+ pte->may_execute = true;
+ if (!pte->may_read) {
+ printk(KERN_INFO "BAT is not readable!\n");
+ continue;
+ }
+ if (iswrite && !pte->may_write) {
+ dprintk_pte("BAT is read-only!\n");
+ continue;
+ }
+
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
+ struct kvmppc_pte *pte, bool data,
+ bool iswrite, bool primary)
+{
+ u32 sre;
+ hva_t ptegp;
+ u32 pteg[16];
+ u32 pte0, pte1;
+ u32 ptem = 0;
+ int i;
+ int found = 0;
+
+ sre = find_sr(vcpu, eaddr);
+
+ dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28,
+ sr_vsid(sre), sre);
+
+ pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
+
+ ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, sre, eaddr, primary);
+ if (kvm_is_error_hva(ptegp)) {
+ printk(KERN_INFO "KVM: Invalid PTEG!\n");
+ goto no_page_found;
+ }
+
+ ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);
+
+ if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
+ printk_ratelimited(KERN_ERR
+ "KVM: Can't copy data from 0x%lx!\n", ptegp);
+ goto no_page_found;
+ }
+
+ for (i=0; i<16; i+=2) {
+ pte0 = be32_to_cpu(pteg[i]);
+ pte1 = be32_to_cpu(pteg[i + 1]);
+ if (ptem == pte0) {
+ u8 pp;
+
+ pte->raddr = (pte1 & ~(0xFFFULL)) | (eaddr & 0xFFF);
+ pp = pte1 & 3;
+
+ if ((sr_kp(sre) && (kvmppc_get_msr(vcpu) & MSR_PR)) ||
+ (sr_ks(sre) && !(kvmppc_get_msr(vcpu) & MSR_PR)))
+ pp |= 4;
+
+ pte->may_write = false;
+ pte->may_read = false;
+ pte->may_execute = true;
+ switch (pp) {
+ case 0:
+ case 1:
+ case 2:
+ case 6:
+ pte->may_write = true;
+ case 3:
+ case 5:
+ case 7:
+ pte->may_read = true;
+ break;
+ }
+
+ dprintk_pte("MMU: Found PTE -> %x %x - %x\n",
+ pte0, pte1, pp);
+ found = 1;
+ break;
+ }
+ }
+
+ /* Update PTE C and A bits, so the guest's swapper knows we used the
+ page */
+ if (found) {
+ u32 pte_r = pte1;
+ char __user *addr = (char __user *) (ptegp + (i+1) * sizeof(u32));
+
+ /*
+ * Use single-byte writes to update the HPTE, to
+ * conform to what real hardware does.
+ */
+ if (pte->may_read && !(pte_r & PTEG_FLAG_ACCESSED)) {
+ pte_r |= PTEG_FLAG_ACCESSED;
+ put_user(pte_r >> 8, addr + 2);
+ }
+ if (iswrite && pte->may_write && !(pte_r & PTEG_FLAG_DIRTY)) {
+ pte_r |= PTEG_FLAG_DIRTY;
+ put_user(pte_r, addr + 3);
+ }
+ if (!pte->may_read || (iswrite && !pte->may_write))
+ return -EPERM;
+ return 0;
+ }
+
+no_page_found:
+
+ if (check_debug_ip(vcpu)) {
+ dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n",
+ to_book3s(vcpu)->sdr1, ptegp);
+ for (i=0; i<16; i+=2) {
+ dprintk_pte(" %02d: 0x%x - 0x%x (0x%x)\n",
+ i, be32_to_cpu(pteg[i]),
+ be32_to_cpu(pteg[i+1]), ptem);
+ }
+ }
+
+ return -ENOENT;
+}
+
+static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
+ struct kvmppc_pte *pte, bool data,
+ bool iswrite)
+{
+ int r;
+ ulong mp_ea = vcpu->arch.magic_page_ea;
+
+ pte->eaddr = eaddr;
+ pte->page_size = MMU_PAGE_4K;
+
+ /* Magic page override */
+ if (unlikely(mp_ea) &&
+ unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
+ !(kvmppc_get_msr(vcpu) & MSR_PR)) {
+ pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
+ pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff);
+ pte->raddr &= KVM_PAM;
+ pte->may_execute = true;
+ pte->may_read = true;
+ pte->may_write = true;
+
+ return 0;
+ }
+
+ r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data, iswrite);
+ if (r < 0)
+ r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte,
+ data, iswrite, true);
+ if (r == -ENOENT)
+ r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte,
+ data, iswrite, false);
+
+ return r;
+}
+
+
+static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum)
+{
+ return kvmppc_get_sr(vcpu, srnum);
+}
+
+static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
+ ulong value)
+{
+ kvmppc_set_sr(vcpu, srnum, value);
+ kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT);
+}
+
+static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large)
+{
+ int i;
+ struct kvm_vcpu *v;
+
+ /* flush this VA on all cpus */
+ kvm_for_each_vcpu(i, v, vcpu->kvm)
+ kvmppc_mmu_pte_flush(v, ea, 0x0FFFF000);
+}
+
+static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
+ u64 *vsid)
+{
+ ulong ea = esid << SID_SHIFT;
+ u32 sr;
+ u64 gvsid = esid;
+ u64 msr = kvmppc_get_msr(vcpu);
+
+ if (msr & (MSR_DR|MSR_IR)) {
+ sr = find_sr(vcpu, ea);
+ if (sr_valid(sr))
+ gvsid = sr_vsid(sr);
+ }
+
+ /* In case we only have one of MSR_IR or MSR_DR set, let's put
+ that in the real-mode context (and hope RM doesn't access
+ high memory) */
+ switch (msr & (MSR_DR|MSR_IR)) {
+ case 0:
+ *vsid = VSID_REAL | esid;
+ break;
+ case MSR_IR:
+ *vsid = VSID_REAL_IR | gvsid;
+ break;
+ case MSR_DR:
+ *vsid = VSID_REAL_DR | gvsid;
+ break;
+ case MSR_DR|MSR_IR:
+ if (sr_valid(sr))
+ *vsid = sr_vsid(sr);
+ else
+ *vsid = VSID_BAT | gvsid;
+ break;
+ default:
+ BUG();
+ }
+
+ if (msr & MSR_PR)
+ *vsid |= VSID_PR;
+
+ return 0;
+}
+
+static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu)
+{
+ return true;
+}
+
+
+void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu)
+{
+ struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
+
+ mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin;
+ mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin;
+ mmu->xlate = kvmppc_mmu_book3s_32_xlate;
+ mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr;
+ mmu->tlbie = kvmppc_mmu_book3s_32_tlbie;
+ mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid;
+ mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp;
+ mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32;
+
+ mmu->slbmte = NULL;
+ mmu->slbmfee = NULL;
+ mmu->slbmfev = NULL;
+ mmu->slbie = NULL;
+ mmu->slbia = NULL;
+}
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