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-rw-r--r--arch/powerpc/kvm/book3s_hv_rm_mmu.c212
1 files changed, 125 insertions, 87 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
index d3e36fc77e2..ba4a1376b33 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
@@ -140,6 +140,12 @@ static pte_t lookup_linux_pte(struct kvm_vcpu *vcpu, unsigned long hva,
return kvmppc_read_update_linux_pte(ptep, writing);
}
+static inline void unlock_hpte(unsigned long *hpte, unsigned long hpte_v)
+{
+ asm volatile(PPC_RELEASE_BARRIER "" : : : "memory");
+ hpte[0] = hpte_v;
+}
+
long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
long pte_index, unsigned long pteh, unsigned long ptel)
{
@@ -356,6 +362,7 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
struct kvm *kvm = vcpu->kvm;
unsigned long *hpte;
unsigned long v, r, rb;
+ struct revmap_entry *rev;
if (pte_index >= HPT_NPTE)
return H_PARAMETER;
@@ -368,30 +375,32 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
hpte[0] &= ~HPTE_V_HVLOCK;
return H_NOT_FOUND;
}
- if (atomic_read(&kvm->online_vcpus) == 1)
- flags |= H_LOCAL;
- vcpu->arch.gpr[4] = v = hpte[0] & ~HPTE_V_HVLOCK;
- vcpu->arch.gpr[5] = r = hpte[1];
- rb = compute_tlbie_rb(v, r, pte_index);
- if (v & HPTE_V_VALID)
+
+ rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
+ v = hpte[0] & ~HPTE_V_HVLOCK;
+ if (v & HPTE_V_VALID) {
+ hpte[0] &= ~HPTE_V_VALID;
+ rb = compute_tlbie_rb(v, hpte[1], pte_index);
+ if (!(flags & H_LOCAL) && atomic_read(&kvm->online_vcpus) > 1) {
+ while (!try_lock_tlbie(&kvm->arch.tlbie_lock))
+ cpu_relax();
+ asm volatile("ptesync" : : : "memory");
+ asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
+ : : "r" (rb), "r" (kvm->arch.lpid));
+ asm volatile("ptesync" : : : "memory");
+ kvm->arch.tlbie_lock = 0;
+ } else {
+ asm volatile("ptesync" : : : "memory");
+ asm volatile("tlbiel %0" : : "r" (rb));
+ asm volatile("ptesync" : : : "memory");
+ }
remove_revmap_chain(kvm, pte_index, v);
- smp_wmb();
- hpte[0] = 0;
- if (!(v & HPTE_V_VALID))
- return H_SUCCESS;
- if (!(flags & H_LOCAL)) {
- while (!try_lock_tlbie(&kvm->arch.tlbie_lock))
- cpu_relax();
- asm volatile("ptesync" : : : "memory");
- asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
- : : "r" (rb), "r" (kvm->arch.lpid));
- asm volatile("ptesync" : : : "memory");
- kvm->arch.tlbie_lock = 0;
- } else {
- asm volatile("ptesync" : : : "memory");
- asm volatile("tlbiel %0" : : "r" (rb));
- asm volatile("ptesync" : : : "memory");
}
+ r = rev->guest_rpte;
+ unlock_hpte(hpte, 0);
+
+ vcpu->arch.gpr[4] = v;
+ vcpu->arch.gpr[5] = r;
return H_SUCCESS;
}
@@ -399,82 +408,113 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
unsigned long *args = &vcpu->arch.gpr[4];
- unsigned long *hp, tlbrb[4];
- long int i, found;
- long int n_inval = 0;
- unsigned long flags, req, pte_index;
+ unsigned long *hp, *hptes[4], tlbrb[4];
+ long int i, j, k, n, found, indexes[4];
+ unsigned long flags, req, pte_index, rcbits;
long int local = 0;
long int ret = H_SUCCESS;
+ struct revmap_entry *rev, *revs[4];
if (atomic_read(&kvm->online_vcpus) == 1)
local = 1;
- for (i = 0; i < 4; ++i) {
- pte_index = args[i * 2];
- flags = pte_index >> 56;
- pte_index &= ((1ul << 56) - 1);
- req = flags >> 6;
- flags &= 3;
- if (req == 3)
- break;
- if (req != 1 || flags == 3 ||
- pte_index >= HPT_NPTE) {
- /* parameter error */
- args[i * 2] = ((0xa0 | flags) << 56) + pte_index;
- ret = H_PARAMETER;
- break;
- }
- hp = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
- while (!try_lock_hpte(hp, HPTE_V_HVLOCK))
- cpu_relax();
- found = 0;
- if (hp[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) {
- switch (flags & 3) {
- case 0: /* absolute */
- found = 1;
+ for (i = 0; i < 4 && ret == H_SUCCESS; ) {
+ n = 0;
+ for (; i < 4; ++i) {
+ j = i * 2;
+ pte_index = args[j];
+ flags = pte_index >> 56;
+ pte_index &= ((1ul << 56) - 1);
+ req = flags >> 6;
+ flags &= 3;
+ if (req == 3) { /* no more requests */
+ i = 4;
break;
- case 1: /* andcond */
- if (!(hp[0] & args[i * 2 + 1]))
- found = 1;
+ }
+ if (req != 1 || flags == 3 || pte_index >= HPT_NPTE) {
+ /* parameter error */
+ args[j] = ((0xa0 | flags) << 56) + pte_index;
+ ret = H_PARAMETER;
break;
- case 2: /* AVPN */
- if ((hp[0] & ~0x7fUL) == args[i * 2 + 1])
+ }
+ hp = (unsigned long *)
+ (kvm->arch.hpt_virt + (pte_index << 4));
+ /* to avoid deadlock, don't spin except for first */
+ if (!try_lock_hpte(hp, HPTE_V_HVLOCK)) {
+ if (n)
+ break;
+ while (!try_lock_hpte(hp, HPTE_V_HVLOCK))
+ cpu_relax();
+ }
+ found = 0;
+ if (hp[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) {
+ switch (flags & 3) {
+ case 0: /* absolute */
found = 1;
- break;
+ break;
+ case 1: /* andcond */
+ if (!(hp[0] & args[j + 1]))
+ found = 1;
+ break;
+ case 2: /* AVPN */
+ if ((hp[0] & ~0x7fUL) == args[j + 1])
+ found = 1;
+ break;
+ }
+ }
+ if (!found) {
+ hp[0] &= ~HPTE_V_HVLOCK;
+ args[j] = ((0x90 | flags) << 56) + pte_index;
+ continue;
}
+
+ args[j] = ((0x80 | flags) << 56) + pte_index;
+ rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
+ /* insert R and C bits from guest PTE */
+ rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C);
+ args[j] |= rcbits << (56 - 5);
+
+ if (!(hp[0] & HPTE_V_VALID))
+ continue;
+
+ hp[0] &= ~HPTE_V_VALID; /* leave it locked */
+ tlbrb[n] = compute_tlbie_rb(hp[0], hp[1], pte_index);
+ indexes[n] = j;
+ hptes[n] = hp;
+ revs[n] = rev;
+ ++n;
}
- if (!found) {
- hp[0] &= ~HPTE_V_HVLOCK;
- args[i * 2] = ((0x90 | flags) << 56) + pte_index;
- continue;
+
+ if (!n)
+ break;
+
+ /* Now that we've collected a batch, do the tlbies */
+ if (!local) {
+ while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
+ cpu_relax();
+ asm volatile("ptesync" : : : "memory");
+ for (k = 0; k < n; ++k)
+ asm volatile(PPC_TLBIE(%1,%0) : :
+ "r" (tlbrb[k]),
+ "r" (kvm->arch.lpid));
+ asm volatile("eieio; tlbsync; ptesync" : : : "memory");
+ kvm->arch.tlbie_lock = 0;
+ } else {
+ asm volatile("ptesync" : : : "memory");
+ for (k = 0; k < n; ++k)
+ asm volatile("tlbiel %0" : : "r" (tlbrb[k]));
+ asm volatile("ptesync" : : : "memory");
}
- /* insert R and C bits from PTE */
- flags |= (hp[1] >> 5) & 0x0c;
- args[i * 2] = ((0x80 | flags) << 56) + pte_index;
- if (hp[0] & HPTE_V_VALID) {
- tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index);
+
+ for (k = 0; k < n; ++k) {
+ j = indexes[k];
+ pte_index = args[j] & ((1ul << 56) - 1);
+ hp = hptes[k];
+ rev = revs[k];
remove_revmap_chain(kvm, pte_index, hp[0]);
+ unlock_hpte(hp, 0);
}
- smp_wmb();
- hp[0] = 0;
- }
- if (n_inval == 0)
- return ret;
-
- if (!local) {
- while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
- cpu_relax();
- asm volatile("ptesync" : : : "memory");
- for (i = 0; i < n_inval; ++i)
- asm volatile(PPC_TLBIE(%1,%0)
- : : "r" (tlbrb[i]), "r" (kvm->arch.lpid));
- asm volatile("eieio; tlbsync; ptesync" : : : "memory");
- kvm->arch.tlbie_lock = 0;
- } else {
- asm volatile("ptesync" : : : "memory");
- for (i = 0; i < n_inval; ++i)
- asm volatile("tlbiel %0" : : "r" (tlbrb[i]));
- asm volatile("ptesync" : : : "memory");
}
+
return ret;
}
@@ -720,9 +760,7 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
rev = real_vmalloc_addr(&kvm->arch.revmap[index]);
gr = rev->guest_rpte;
- /* Unlock the HPTE */
- asm volatile("lwsync" : : : "memory");
- hpte[0] = v;
+ unlock_hpte(hpte, v);
/* For not found, if the HPTE is valid by now, retry the instruction */
if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID))
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-02-05 21:05:54 +0000