From 3032341853daf07c723084a086ebe7a9bdf8f90b Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 8 Oct 2018 16:31:13 +1100 Subject: [PATCH] KVM: PPC: Book3S HV: Add one-reg interface to virtual PTCR register This adds a one-reg register identifier which can be used to read and set the virtual PTCR for the guest. This register identifies the address and size of the virtual partition table for the guest, which contains information about the nested guests under this guest. Migrating this value is the only extra requirement for migrating a guest which has nested guests (assuming of course that the destination host supports nested virtualization in the kvm-hv module). Reviewed-by: David Gibson Signed-off-by: Paul Mackerras Signed-off-by: Michael Ellerman --- Documentation/virtual/kvm/api.txt | 1 + arch/powerpc/include/uapi/asm/kvm.h | 1 + arch/powerpc/kvm/book3s_hv.c | 6 ++++++ 3 files changed, 8 insertions(+) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index c664064..017d851 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1922,6 +1922,7 @@ registers, find a list below: PPC | KVM_REG_PPC_TIDR | 64 PPC | KVM_REG_PPC_PSSCR | 64 PPC | KVM_REG_PPC_DEC_EXPIRY | 64 + PPC | KVM_REG_PPC_PTCR | 64 PPC | KVM_REG_PPC_TM_GPR0 | 64 ... PPC | KVM_REG_PPC_TM_GPR31 | 64 diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h index 1b32b56..8c876c1 100644 --- a/arch/powerpc/include/uapi/asm/kvm.h +++ b/arch/powerpc/include/uapi/asm/kvm.h @@ -634,6 +634,7 @@ struct kvm_ppc_cpu_char { #define KVM_REG_PPC_DEC_EXPIRY (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xbe) #define KVM_REG_PPC_ONLINE (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0xbf) +#define KVM_REG_PPC_PTCR (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc0) /* Transactional Memory checkpointed state: * This is all GPRs, all VSX regs and a subset of SPRs diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index c90deb5..8458bbe 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -1710,6 +1710,9 @@ static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, case KVM_REG_PPC_ONLINE: *val = get_reg_val(id, vcpu->arch.online); break; + case KVM_REG_PPC_PTCR: + *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr); + break; default: r = -EINVAL; break; @@ -1941,6 +1944,9 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, atomic_dec(&vcpu->arch.vcore->online_count); vcpu->arch.online = i; break; + case KVM_REG_PPC_PTCR: + vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val); + break; default: r = -EINVAL; break; -- 2.7.4