KVM: PPC: Add PAPR hypercall code for PR mode

When running a PAPR guest, we need to handle a few hypercalls in kernel space,
most prominently the page table invalidation (to sync the shadows).

So this patch adds handling for a few PAPR hypercalls to PR mode KVM. I tried
to share the code with HV mode, but it ended up being a lot easier this way
around, as the two differ too much in those details.

Signed-off-by: Alexander Graf <agraf@suse.de>

---

v1 -> v2:

  - whitespace fix

3 files changed, 160 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index 472437b7b85d..91d41fabc5b0 100644
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -150,6 +150,7 @@ extern void kvmppc_load_up_altivec(void);
 extern void kvmppc_load_up_vsx(void);
 extern u32 kvmppc_alignment_dsisr(struct kvm_vcpu *vcpu, unsigned int inst);
 extern ulong kvmppc_alignment_dar(struct kvm_vcpu *vcpu, unsigned int inst);
+extern int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd);
 
 static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)
 {
diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index 08428e2c188d..4c66d51dbd38 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -43,6 +43,7 @@ kvm-book3s_64-objs-$(CONFIG_KVM_BOOK3S_64_PR) := \
         fpu.o \
         book3s_paired_singles.o \
         book3s_pr.o \
+        book3s_pr_papr.o \
         book3s_emulate.o \
         book3s_interrupts.o \
         book3s_mmu_hpte.o \
diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
new file mode 100644
index 000000000000..b9589324797b
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_pr_papr.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2011. Freescale Inc. All rights reserved.
+ *
+ * Authors:
+ *    Alexander Graf <agraf@suse.de>
+ *    Paul Mackerras <paulus@samba.org>
+ *
+ * Description:
+ *
+ * Hypercall handling for running PAPR guests in PR KVM on Book 3S
+ * processors.
+ *
+ * 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.
+ */
+
+#include <asm/uaccess.h>
+#include <asm/kvm_ppc.h>
+#include <asm/kvm_book3s.h>
+
+static unsigned long get_pteg_addr(struct kvm_vcpu *vcpu, long pte_index)
+{
+        struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
+        unsigned long pteg_addr;
+
+        pte_index <<= 4;
+        pte_index &= ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1) << 7 | 0x70;
+        pteg_addr = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
+        pteg_addr |= pte_index;
+
+        return pteg_addr;
+}
+
+static int kvmppc_h_pr_enter(struct kvm_vcpu *vcpu)
+{
+        long flags = kvmppc_get_gpr(vcpu, 4);
+        long pte_index = kvmppc_get_gpr(vcpu, 5);
+        unsigned long pteg[2 * 8];
+        unsigned long pteg_addr, i, *hpte;
+
+        pte_index &= ~7UL;
+        pteg_addr = get_pteg_addr(vcpu, pte_index);
+
+        copy_from_user(pteg, (void __user *)pteg_addr, sizeof(pteg));
+        hpte = pteg;
+
+        if (likely((flags & H_EXACT) == 0)) {
+                pte_index &= ~7UL;
+                for (i = 0; ; ++i) {
+                        if (i == 8)
+                                return H_PTEG_FULL;
+                        if ((*hpte & HPTE_V_VALID) == 0)
+                                break;
+                        hpte += 2;
+                }
+        } else {
+                i = kvmppc_get_gpr(vcpu, 5) & 7UL;
+                hpte += i * 2;
+        }
+
+        hpte[0] = kvmppc_get_gpr(vcpu, 6);
+        hpte[1] = kvmppc_get_gpr(vcpu, 7);
+        copy_to_user((void __user *)pteg_addr, pteg, sizeof(pteg));
+        kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
+        kvmppc_set_gpr(vcpu, 4, pte_index | i);
+
+        return EMULATE_DONE;
+}
+
+static int kvmppc_h_pr_remove(struct kvm_vcpu *vcpu)
+{
+        unsigned long flags= kvmppc_get_gpr(vcpu, 4);
+        unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
+        unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
+        unsigned long v = 0, pteg, rb;
+        unsigned long pte[2];
+
+        pteg = get_pteg_addr(vcpu, pte_index);
+        copy_from_user(pte, (void __user *)pteg, sizeof(pte));
+
+        if ((pte[0] & HPTE_V_VALID) == 0 ||
+            ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn) ||
+            ((flags & H_ANDCOND) && (pte[0] & avpn) != 0)) {
+                kvmppc_set_gpr(vcpu, 3, H_NOT_FOUND);
+                return EMULATE_DONE;
+        }
+
+        copy_to_user((void __user *)pteg, &v, sizeof(v));
+
+        rb = compute_tlbie_rb(pte[0], pte[1], pte_index);
+        vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
+
+        kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
+        kvmppc_set_gpr(vcpu, 4, pte[0]);
+        kvmppc_set_gpr(vcpu, 5, pte[1]);
+
+        return EMULATE_DONE;
+}
+
+static int kvmppc_h_pr_protect(struct kvm_vcpu *vcpu)
+{
+        unsigned long flags = kvmppc_get_gpr(vcpu, 4);
+        unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
+        unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
+        unsigned long rb, pteg, r, v;
+        unsigned long pte[2];
+
+        pteg = get_pteg_addr(vcpu, pte_index);
+        copy_from_user(pte, (void __user *)pteg, sizeof(pte));
+
+        if ((pte[0] & HPTE_V_VALID) == 0 ||
+            ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn)) {
+                kvmppc_set_gpr(vcpu, 3, H_NOT_FOUND);
+                return EMULATE_DONE;
+        }
+
+        v = pte[0];
+        r = pte[1];
+        r &= ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_HI |
+               HPTE_R_KEY_LO);
+        r |= (flags << 55) & HPTE_R_PP0;
+        r |= (flags << 48) & HPTE_R_KEY_HI;
+        r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
+
+        pte[1] = r;
+
+        rb = compute_tlbie_rb(v, r, pte_index);
+        vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
+        copy_to_user((void __user *)pteg, pte, sizeof(pte));
+
+        kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
+
+        return EMULATE_DONE;
+}
+
+int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
+{
+        switch (cmd) {
+        case H_ENTER:
+                return kvmppc_h_pr_enter(vcpu);
+        case H_REMOVE:
+                return kvmppc_h_pr_remove(vcpu);
+        case H_PROTECT:
+                return kvmppc_h_pr_protect(vcpu);
+        case H_BULK_REMOVE:
+                /* We just flush all PTEs, so user space can
+                   handle the HPT modifications */
+                kvmppc_mmu_pte_flush(vcpu, 0, 0);
+                break;
+        case H_CEDE:
+                kvm_vcpu_block(vcpu);
+                vcpu->stat.halt_wakeup++;
+                return EMULATE_DONE;
+        }
+
+        return EMULATE_FAIL;
+}