From: Alexander Graf Date: Fri, 14 Dec 2012 22:42:05 +0000 (+0100) Subject: KVM: PPC: Book3S: PR: Enable alternative instruction for SC 1 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=50c7bb80b5bd5a9962905306dd2292eeb9857d46;p=linux-beck.git KVM: PPC: Book3S: PR: Enable alternative instruction for SC 1 When running on top of pHyp, the hypercall instruction "sc 1" goes straight into pHyp without trapping in supervisor mode. So if we want to support PAPR guest in this configuration we need to add a second way of accessing PAPR hypercalls, preferably with the exact same semantics except for the instruction. So let's overlay an officially reserved instruction and emulate PAPR hypercalls whenever we hit that one. Signed-off-by: Alexander Graf --- diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 572aa7530619..5f5f69abd281 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -44,6 +44,7 @@ enum emulation_result { EMULATE_DO_DCR, /* kvm_run filled with DCR request */ EMULATE_FAIL, /* can't emulate this instruction */ EMULATE_AGAIN, /* something went wrong. go again */ + EMULATE_DO_PAPR, /* kvm_run filled with PAPR request */ }; extern int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu); diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c index d31a716f7f2b..c88161bed8df 100644 --- a/arch/powerpc/kvm/book3s_emulate.c +++ b/arch/powerpc/kvm/book3s_emulate.c @@ -34,6 +34,8 @@ #define OP_31_XOP_MTSRIN 242 #define OP_31_XOP_TLBIEL 274 #define OP_31_XOP_TLBIE 306 +/* Opcode is officially reserved, reuse it as sc 1 when sc 1 doesn't trap */ +#define OP_31_XOP_FAKE_SC1 308 #define OP_31_XOP_SLBMTE 402 #define OP_31_XOP_SLBIE 434 #define OP_31_XOP_SLBIA 498 @@ -170,6 +172,32 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu, vcpu->arch.mmu.tlbie(vcpu, addr, large); break; } +#ifdef CONFIG_KVM_BOOK3S_64_PR + case OP_31_XOP_FAKE_SC1: + { + /* SC 1 papr hypercalls */ + ulong cmd = kvmppc_get_gpr(vcpu, 3); + int i; + + if ((vcpu->arch.shared->msr & MSR_PR) || + !vcpu->arch.papr_enabled) { + emulated = EMULATE_FAIL; + break; + } + + if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) + break; + + run->papr_hcall.nr = cmd; + for (i = 0; i < 9; ++i) { + ulong gpr = kvmppc_get_gpr(vcpu, 4 + i); + run->papr_hcall.args[i] = gpr; + } + + emulated = EMULATE_DO_PAPR; + break; + } +#endif case OP_31_XOP_EIOIO: break; case OP_31_XOP_SLBMTE: diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 28d38adeca73..73ed11c41bac 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -760,6 +760,11 @@ program_interrupt: run->exit_reason = KVM_EXIT_MMIO; r = RESUME_HOST_NV; break; + case EMULATE_DO_PAPR: + run->exit_reason = KVM_EXIT_PAPR_HCALL; + vcpu->arch.hcall_needed = 1; + r = RESUME_HOST_NV; + break; default: BUG(); }