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| author |   Alexander Graf <agraf@suse.de> | 2014-06-20 14:43:36 +0200 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-07-28 16:35:53 +0200 |
| commit | c12fb43c2f6d6a57a4e21afe74ff56485d699ee7 (patch) | |
| tree | 4e5b0697bebd43348fa15f116b1c746ef561a9cb /arch/powerpc/kvm | |
| parent | KVM: PPC: Use kvm_read_guest in kvmppc_ld (diff) | |
| download | linux-dev-c12fb43c2f6d6a57a4e21afe74ff56485d699ee7.tar.xz linux-dev-c12fb43c2f6d6a57a4e21afe74ff56485d699ee7.zip | |
KVM: PPC: Handle magic page in kvmppc_ld/st
We use kvmppc_ld and kvmppc_st to emulate load/store instructions that may as
well access the magic page. Special case it out so that we can properly access
it.
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm')
| -rw-r--r-- | arch/powerpc/kvm/powerpc.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index be40886e8f0a..544d1d30c8cc 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -312,6 +312,7 @@ EXPORT_SYMBOL_GPL(kvmppc_emulate_mmio); int kvmppc_st(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr, bool data) { + ulong mp_pa = vcpu->arch.magic_page_pa & KVM_PAM & PAGE_MASK; struct kvmppc_pte pte; int r; @@ -327,6 +328,16 @@ int kvmppc_st(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr, if (!pte.may_write) return -EPERM; + /* Magic page override */ + if (kvmppc_supports_magic_page(vcpu) && mp_pa && + ((pte.raddr & KVM_PAM & PAGE_MASK) == mp_pa) && + !(kvmppc_get_msr(vcpu) & MSR_PR)) { + void *magic = vcpu->arch.shared; + magic += pte.eaddr & 0xfff; + memcpy(magic, ptr, size); + return EMULATE_DONE; + } + if (kvm_write_guest(vcpu->kvm, pte.raddr, ptr, size)) return EMULATE_DO_MMIO; @@ -337,6 +348,7 @@ EXPORT_SYMBOL_GPL(kvmppc_st); int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr, bool data) { + ulong mp_pa = vcpu->arch.magic_page_pa & KVM_PAM & PAGE_MASK; struct kvmppc_pte pte; int rc; @@ -355,6 +367,16 @@ int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr, if (!data && !pte.may_execute) return -ENOEXEC; + /* Magic page override */ + if (kvmppc_supports_magic_page(vcpu) && mp_pa && + ((pte.raddr & KVM_PAM & PAGE_MASK) == mp_pa) && + !(kvmppc_get_msr(vcpu) & MSR_PR)) { + void *magic = vcpu->arch.shared; + magic += pte.eaddr & 0xfff; + memcpy(ptr, magic, size); + return EMULATE_DONE; + } + if (kvm_read_guest(vcpu->kvm, pte.raddr, ptr, size)) return EMULATE_DO_MMIO; |