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Diffstat (limited to 'arch/powerpc/kvm/book3s_64_mmu.c')
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu.c328
1 files changed, 222 insertions, 106 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c
index 739bfbadb85..774a253ca4e 100644
--- a/arch/powerpc/kvm/book3s_64_mmu.c
+++ b/arch/powerpc/kvm/book3s_64_mmu.c
@@ -38,7 +38,7 @@
static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)
{
- kvmppc_set_msr(vcpu, MSR_SF);
+ kvmppc_set_msr(vcpu, vcpu->arch.intr_msr);
}
static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(
@@ -107,9 +107,20 @@ static u64 kvmppc_mmu_book3s_64_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
return kvmppc_slb_calc_vpn(slb, eaddr);
}
+static int mmu_pagesize(int mmu_pg)
+{
+ switch (mmu_pg) {
+ case MMU_PAGE_64K:
+ return 16;
+ case MMU_PAGE_16M:
+ return 24;
+ }
+ return 12;
+}
+
static int kvmppc_mmu_book3s_64_get_pagesize(struct kvmppc_slb *slbe)
{
- return slbe->large ? 24 : 12;
+ return mmu_pagesize(slbe->base_page_size);
}
static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr)
@@ -119,11 +130,11 @@ static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr)
return ((eaddr & kvmppc_slb_offset_mask(slbe)) >> p);
}
-static hva_t kvmppc_mmu_book3s_64_get_pteg(
- struct kvmppc_vcpu_book3s *vcpu_book3s,
+static hva_t kvmppc_mmu_book3s_64_get_pteg(struct kvm_vcpu *vcpu,
struct kvmppc_slb *slbe, gva_t eaddr,
bool second)
{
+ struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
u64 hash, pteg, htabsize;
u32 ssize;
hva_t r;
@@ -148,10 +159,10 @@ static hva_t kvmppc_mmu_book3s_64_get_pteg(
/* When running a PAPR guest, SDR1 contains a HVA address instead
of a GPA */
- if (vcpu_book3s->vcpu.arch.papr_enabled)
+ if (vcpu->arch.papr_enabled)
r = pteg;
else
- r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);
+ r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT);
if (kvm_is_error_hva(r))
return r;
@@ -166,32 +177,56 @@ static u64 kvmppc_mmu_book3s_64_get_avpn(struct kvmppc_slb *slbe, gva_t eaddr)
avpn = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
avpn |= slbe->vsid << (kvmppc_slb_sid_shift(slbe) - p);
- if (p < 24)
- avpn >>= ((80 - p) - 56) - 8;
+ if (p < 16)
+ avpn >>= ((80 - p) - 56) - 8; /* 16 - p */
else
- avpn <<= 8;
+ avpn <<= p - 16;
return avpn;
}
+/*
+ * Return page size encoded in the second word of a HPTE, or
+ * -1 for an invalid encoding for the base page size indicated by
+ * the SLB entry. This doesn't handle mixed pagesize segments yet.
+ */
+static int decode_pagesize(struct kvmppc_slb *slbe, u64 r)
+{
+ switch (slbe->base_page_size) {
+ case MMU_PAGE_64K:
+ if ((r & 0xf000) == 0x1000)
+ return MMU_PAGE_64K;
+ break;
+ case MMU_PAGE_16M:
+ if ((r & 0xff000) == 0)
+ return MMU_PAGE_16M;
+ break;
+ }
+ return -1;
+}
+
static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
- struct kvmppc_pte *gpte, bool data)
+ struct kvmppc_pte *gpte, bool data,
+ bool iswrite)
{
- struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
struct kvmppc_slb *slbe;
hva_t ptegp;
u64 pteg[16];
u64 avpn = 0;
+ u64 v, r;
+ u64 v_val, v_mask;
+ u64 eaddr_mask;
int i;
- u8 key = 0;
+ u8 pp, key = 0;
bool found = false;
- int second = 0;
+ bool second = false;
+ int pgsize;
ulong mp_ea = vcpu->arch.magic_page_ea;
/* Magic page override */
if (unlikely(mp_ea) &&
unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
- !(vcpu->arch.shared->msr & MSR_PR)) {
+ !(kvmppc_get_msr(vcpu) & MSR_PR)) {
gpte->eaddr = eaddr;
gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu, eaddr, data);
gpte->raddr = vcpu->arch.magic_page_pa | (gpte->raddr & 0xfff);
@@ -199,6 +234,7 @@ static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
gpte->may_execute = true;
gpte->may_read = true;
gpte->may_write = true;
+ gpte->page_size = MMU_PAGE_4K;
return 0;
}
@@ -208,11 +244,23 @@ static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
goto no_seg_found;
avpn = kvmppc_mmu_book3s_64_get_avpn(slbe, eaddr);
+ v_val = avpn & HPTE_V_AVPN;
+
if (slbe->tb)
- avpn |= SLB_VSID_B_1T;
+ v_val |= SLB_VSID_B_1T;
+ if (slbe->large)
+ v_val |= HPTE_V_LARGE;
+ v_val |= HPTE_V_VALID;
+
+ v_mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_LARGE | HPTE_V_VALID |
+ HPTE_V_SECONDARY;
+
+ pgsize = slbe->large ? MMU_PAGE_16M : MMU_PAGE_4K;
+
+ mutex_lock(&vcpu->kvm->arch.hpt_mutex);
do_second:
- ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu_book3s, slbe, eaddr, second);
+ ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu, slbe, eaddr, second);
if (kvm_is_error_hva(ptegp))
goto no_page_found;
@@ -221,102 +269,108 @@ do_second:
goto no_page_found;
}
- if ((vcpu->arch.shared->msr & MSR_PR) && slbe->Kp)
+ if ((kvmppc_get_msr(vcpu) & MSR_PR) && slbe->Kp)
key = 4;
- else if (!(vcpu->arch.shared->msr & MSR_PR) && slbe->Ks)
+ else if (!(kvmppc_get_msr(vcpu) & MSR_PR) && slbe->Ks)
key = 4;
for (i=0; i<16; i+=2) {
- u64 v = pteg[i];
- u64 r = pteg[i+1];
-
- /* Valid check */
- if (!(v & HPTE_V_VALID))
- continue;
- /* Hash check */
- if ((v & HPTE_V_SECONDARY) != second)
- continue;
-
- /* AVPN compare */
- if (HPTE_V_COMPARE(avpn, v)) {
- u8 pp = (r & HPTE_R_PP) | key;
- int eaddr_mask = 0xFFF;
-
- gpte->eaddr = eaddr;
- gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu,
- eaddr,
- data);
- if (slbe->large)
- eaddr_mask = 0xFFFFFF;
- gpte->raddr = (r & HPTE_R_RPN) | (eaddr & eaddr_mask);
- gpte->may_execute = ((r & HPTE_R_N) ? false : true);
- gpte->may_read = false;
- gpte->may_write = false;
-
- switch (pp) {
- case 0:
- case 1:
- case 2:
- case 6:
- gpte->may_write = true;
- /* fall through */
- case 3:
- case 5:
- case 7:
- gpte->may_read = true;
- break;
+ u64 pte0 = be64_to_cpu(pteg[i]);
+ u64 pte1 = be64_to_cpu(pteg[i + 1]);
+
+ /* Check all relevant fields of 1st dword */
+ if ((pte0 & v_mask) == v_val) {
+ /* If large page bit is set, check pgsize encoding */
+ if (slbe->large &&
+ (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE)) {
+ pgsize = decode_pagesize(slbe, pte1);
+ if (pgsize < 0)
+ continue;
}
-
- dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx "
- "-> 0x%lx\n",
- eaddr, avpn, gpte->vpage, gpte->raddr);
found = true;
break;
}
}
- /* Update PTE R and C bits, so the guest's swapper knows we used the
- * page */
- if (found) {
- u32 oldr = pteg[i+1];
+ if (!found) {
+ if (second)
+ goto no_page_found;
+ v_val |= HPTE_V_SECONDARY;
+ second = true;
+ goto do_second;
+ }
- if (gpte->may_read) {
- /* Set the accessed flag */
- pteg[i+1] |= HPTE_R_R;
- }
- if (gpte->may_write) {
- /* Set the dirty flag */
- pteg[i+1] |= HPTE_R_C;
- } else {
- dprintk("KVM: Mapping read-only page!\n");
- }
+ v = be64_to_cpu(pteg[i]);
+ r = be64_to_cpu(pteg[i+1]);
+ pp = (r & HPTE_R_PP) | key;
+ if (r & HPTE_R_PP0)
+ pp |= 8;
+
+ gpte->eaddr = eaddr;
+ gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu, eaddr, data);
+
+ eaddr_mask = (1ull << mmu_pagesize(pgsize)) - 1;
+ gpte->raddr = (r & HPTE_R_RPN & ~eaddr_mask) | (eaddr & eaddr_mask);
+ gpte->page_size = pgsize;
+ gpte->may_execute = ((r & HPTE_R_N) ? false : true);
+ if (unlikely(vcpu->arch.disable_kernel_nx) &&
+ !(kvmppc_get_msr(vcpu) & MSR_PR))
+ gpte->may_execute = true;
+ gpte->may_read = false;
+ gpte->may_write = false;
- /* Write back into the PTEG */
- if (pteg[i+1] != oldr)
- copy_to_user((void __user *)ptegp, pteg, sizeof(pteg));
+ switch (pp) {
+ case 0:
+ case 1:
+ case 2:
+ case 6:
+ gpte->may_write = true;
+ /* fall through */
+ case 3:
+ case 5:
+ case 7:
+ case 10:
+ gpte->may_read = true;
+ break;
+ }
- if (!gpte->may_read)
- return -EPERM;
- return 0;
- } else {
- dprintk("KVM MMU: No PTE found (ea=0x%lx sdr1=0x%llx "
- "ptegp=0x%lx)\n",
- eaddr, to_book3s(vcpu)->sdr1, ptegp);
- for (i = 0; i < 16; i += 2)
- dprintk(" %02d: 0x%llx - 0x%llx (0x%llx)\n",
- i, pteg[i], pteg[i+1], avpn);
-
- if (!second) {
- second = HPTE_V_SECONDARY;
- goto do_second;
- }
+ dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx "
+ "-> 0x%lx\n",
+ eaddr, avpn, gpte->vpage, gpte->raddr);
+
+ /* Update PTE R and C bits, so the guest's swapper knows we used the
+ * page */
+ if (gpte->may_read && !(r & HPTE_R_R)) {
+ /*
+ * Set the accessed flag.
+ * We have to write this back with a single byte write
+ * because another vcpu may be accessing this on
+ * non-PAPR platforms such as mac99, and this is
+ * what real hardware does.
+ */
+ char __user *addr = (char __user *) (ptegp + (i + 1) * sizeof(u64));
+ r |= HPTE_R_R;
+ put_user(r >> 8, addr + 6);
}
+ if (iswrite && gpte->may_write && !(r & HPTE_R_C)) {
+ /* Set the dirty flag */
+ /* Use a single byte write */
+ char __user *addr = (char __user *) (ptegp + (i + 1) * sizeof(u64));
+ r |= HPTE_R_C;
+ put_user(r, addr + 7);
+ }
+
+ mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
+
+ if (!gpte->may_read || (iswrite && !gpte->may_write))
+ return -EPERM;
+ return 0;
no_page_found:
+ mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
return -ENOENT;
no_seg_found:
-
dprintk("KVM MMU: Trigger segment fault\n");
return -EINVAL;
}
@@ -351,6 +405,21 @@ static void kvmppc_mmu_book3s_64_slbmte(struct kvm_vcpu *vcpu, u64 rs, u64 rb)
slbe->nx = (rs & SLB_VSID_N) ? 1 : 0;
slbe->class = (rs & SLB_VSID_C) ? 1 : 0;
+ slbe->base_page_size = MMU_PAGE_4K;
+ if (slbe->large) {
+ if (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE) {
+ switch (rs & SLB_VSID_LP) {
+ case SLB_VSID_LP_00:
+ slbe->base_page_size = MMU_PAGE_16M;
+ break;
+ case SLB_VSID_LP_01:
+ slbe->base_page_size = MMU_PAGE_64K;
+ break;
+ }
+ } else
+ slbe->base_page_size = MMU_PAGE_16M;
+ }
+
slbe->orige = rb & (ESID_MASK | SLB_ESID_V);
slbe->origv = rs;
@@ -416,7 +485,7 @@ static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu)
vcpu->arch.slb[i].origv = 0;
}
- if (vcpu->arch.shared->msr & MSR_IR) {
+ if (kvmppc_get_msr(vcpu) & MSR_IR) {
kvmppc_mmu_flush_segments(vcpu);
kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
}
@@ -466,13 +535,44 @@ static void kvmppc_mmu_book3s_64_tlbie(struct kvm_vcpu *vcpu, ulong va,
bool large)
{
u64 mask = 0xFFFFFFFFFULL;
+ long i;
+ struct kvm_vcpu *v;
dprintk("KVM MMU: tlbie(0x%lx)\n", va);
- if (large)
- mask = 0xFFFFFF000ULL;
- kvmppc_mmu_pte_vflush(vcpu, va >> 12, mask);
+ /*
+ * The tlbie instruction changed behaviour starting with
+ * POWER6. POWER6 and later don't have the large page flag
+ * in the instruction but in the RB value, along with bits
+ * indicating page and segment sizes.
+ */
+ if (vcpu->arch.hflags & BOOK3S_HFLAG_NEW_TLBIE) {
+ /* POWER6 or later */
+ if (va & 1) { /* L bit */
+ if ((va & 0xf000) == 0x1000)
+ mask = 0xFFFFFFFF0ULL; /* 64k page */
+ else
+ mask = 0xFFFFFF000ULL; /* 16M page */
+ }
+ } else {
+ /* older processors, e.g. PPC970 */
+ if (large)
+ mask = 0xFFFFFF000ULL;
+ }
+ /* flush this VA on all vcpus */
+ kvm_for_each_vcpu(i, v, vcpu->kvm)
+ kvmppc_mmu_pte_vflush(v, va >> 12, mask);
+}
+
+#ifdef CONFIG_PPC_64K_PAGES
+static int segment_contains_magic_page(struct kvm_vcpu *vcpu, ulong esid)
+{
+ ulong mp_ea = vcpu->arch.magic_page_ea;
+
+ return mp_ea && !(kvmppc_get_msr(vcpu) & MSR_PR) &&
+ (mp_ea >> SID_SHIFT) == esid;
}
+#endif
static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
u64 *vsid)
@@ -481,11 +581,14 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
struct kvmppc_slb *slb;
u64 gvsid = esid;
ulong mp_ea = vcpu->arch.magic_page_ea;
+ int pagesize = MMU_PAGE_64K;
+ u64 msr = kvmppc_get_msr(vcpu);
- if (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
+ if (msr & (MSR_DR|MSR_IR)) {
slb = kvmppc_mmu_book3s_64_find_slbe(vcpu, ea);
if (slb) {
gvsid = slb->vsid;
+ pagesize = slb->base_page_size;
if (slb->tb) {
gvsid <<= SID_SHIFT_1T - SID_SHIFT;
gvsid |= esid & ((1ul << (SID_SHIFT_1T - SID_SHIFT)) - 1);
@@ -494,37 +597,50 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
}
}
- switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
+ switch (msr & (MSR_DR|MSR_IR)) {
case 0:
- *vsid = VSID_REAL | esid;
+ gvsid = VSID_REAL | esid;
break;
case MSR_IR:
- *vsid = VSID_REAL_IR | gvsid;
+ gvsid |= VSID_REAL_IR;
break;
case MSR_DR:
- *vsid = VSID_REAL_DR | gvsid;
+ gvsid |= VSID_REAL_DR;
break;
case MSR_DR|MSR_IR:
if (!slb)
goto no_slb;
- *vsid = gvsid;
break;
default:
BUG();
break;
}
- if (vcpu->arch.shared->msr & MSR_PR)
- *vsid |= VSID_PR;
+#ifdef CONFIG_PPC_64K_PAGES
+ /*
+ * Mark this as a 64k segment if the host is using
+ * 64k pages, the host MMU supports 64k pages and
+ * the guest segment page size is >= 64k,
+ * but not if this segment contains the magic page.
+ */
+ if (pagesize >= MMU_PAGE_64K &&
+ mmu_psize_defs[MMU_PAGE_64K].shift &&
+ !segment_contains_magic_page(vcpu, esid))
+ gvsid |= VSID_64K;
+#endif
+
+ if (kvmppc_get_msr(vcpu) & MSR_PR)
+ gvsid |= VSID_PR;
+ *vsid = gvsid;
return 0;
no_slb:
/* Catch magic page case */
if (unlikely(mp_ea) &&
unlikely(esid == (mp_ea >> SID_SHIFT)) &&
- !(vcpu->arch.shared->msr & MSR_PR)) {
+ !(kvmppc_get_msr(vcpu) & MSR_PR)) {
*vsid = VSID_REAL | esid;
return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 07:06:08 +0000