This is a shared page used for paravirtualization. It is always present
in the guest kernel's effective address space at the address indicated
by the hypercall that enables it.
The physical address specified by the hypercall is not used, as
e500 does not have real mode.
Signed-off-by: Scott Wood <scottwood@xxxxxxxxxxxxx>
---
arch/powerpc/include/asm/kvm_ppc.h | 1 +
arch/powerpc/kvm/booke.c | 11 +++++++++++
arch/powerpc/kvm/e500_tlb.c | 22 +++++++++++++++++++++-
arch/powerpc/kvm/powerpc.c | 9 +++++----
4 files changed, 38 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 9345238..c662f14 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -109,6 +109,7 @@ extern void kvmppc_booke_exit(void);
extern void kvmppc_core_destroy_mmu(struct kvm_vcpu *vcpu);
extern int kvmppc_kvm_pv(struct kvm_vcpu *vcpu);
+extern void kvmppc_map_magic(struct kvm_vcpu *vcpu);
/*
* Cuts out inst bits with ordering according to spec.
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 85b9391..036625e 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -472,6 +472,17 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
gpa_t gpaddr;
gfn_t gfn;
+#ifdef CONFIG_KVM_E500
+ if (!(vcpu->arch.shared->msr & MSR_PR) &&
+ (eaddr & PAGE_MASK) == vcpu->arch.magic_page_ea) {
+ kvmppc_map_magic(vcpu);
+ kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
+ r = RESUME_GUEST;
+
+ break;
+ }
+#endif
+
/* Check the guest TLB. */
gtlb_index = kvmppc_mmu_dtlb_index(vcpu, eaddr);
if (gtlb_index < 0) {
diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c
index 7f808c5..c09e642 100644
--- a/arch/powerpc/kvm/e500_tlb.c
+++ b/arch/powerpc/kvm/e500_tlb.c
@@ -76,7 +76,8 @@ static inline unsigned int tlb0_get_next_victim(
static inline unsigned int tlb1_max_shadow_size(void)
{
- return tlb1_entry_num - tlbcam_index;
+ /* reserve one entry for magic page */
+ return tlb1_entry_num - tlbcam_index - 1;
}
static inline int tlbe_is_writable(struct tlbe *tlbe)
@@ -142,6 +143,25 @@ static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
}
}
+void kvmppc_map_magic(struct kvm_vcpu *vcpu)
+{
+ struct tlbe magic;
+ ulong shared_page = ((ulong)vcpu->arch.shared) & PAGE_MASK;
+ pfn_t pfn;
+
+ pfn = (pfn_t)virt_to_phys((void *)shared_page) >> PAGE_SHIFT;
+ get_page(pfn_to_page(pfn));
+
+ magic.mas1 = MAS1_VALID | MAS1_TS |
+ MAS1_TSIZE(BOOK3E_PAGESZ_4K);
+ magic.mas2 = vcpu->arch.magic_page_ea | MAS2_M;
+ magic.mas3 = (pfn << PAGE_SHIFT) |
+ MAS3_SW | MAS3_SR | MAS3_UW | MAS3_UR;
+ magic.mas7 = pfn >> (32 - PAGE_SHIFT);
+
+ __write_host_tlbe(&magic, MAS0_TLBSEL(1) | MAS0_ESEL(tlbcam_index));
+}
+
void kvmppc_e500_tlb_load(struct kvm_vcpu *vcpu, int cpu)
{
}
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 616dd51..d5beb72 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -66,16 +66,17 @@ int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
vcpu->arch.magic_page_pa = param1;
vcpu->arch.magic_page_ea = param2;
- r2 = KVM_MAGIC_FEAT_SR;
+#ifdef CONFIG_KVM_E500
+ kvmppc_map_magic(vcpu);
+#endif
+ r2 = KVM_MAGIC_FEAT_SR;
r = HC_EV_SUCCESS;
break;
}
case HC_VENDOR_KVM | KVM_HC_FEATURES:
r = HC_EV_SUCCESS;
-#if defined(CONFIG_PPC_BOOK3S) /* XXX Missing magic page on BookE */
- r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
-#endif
+ r2 = (1 << KVM_FEATURE_MAGIC_PAGE);
/* Second return value is in r4 */
break;
--
1.7.4.1
--
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