KVM: PPC: Book3S HV: Add one-reg interface for HASHKEYR register

The patch adds a one-reg register identifier which can be used to read and set the virtual HASHKEYR for the guest during enter/exit with KVM_REG_PPC_HASHKEYR. The specific SPR KVM API documentation too updated. Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/171759283170.1480.12904332463112769129.stgit@linux.ibm.com
mariux64 · Jun 6, 2024 · e9eb790 · e9eb790
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commit e9eb790
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diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
@@ -2439,6 +2439,7 @@ registers, find a list below:
   PPC     KVM_REG_PPC_PSSCR               64
   PPC     KVM_REG_PPC_DEC_EXPIRY          64
   PPC     KVM_REG_PPC_PTCR                64
+  PPC     KVM_REG_PPC_HASHKEYR            64
   PPC     KVM_REG_PPC_DAWR1               64
   PPC     KVM_REG_PPC_DAWRX1              64
   PPC     KVM_REG_PPC_DEXCR               64

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
@@ -600,6 +600,7 @@ struct kvm_vcpu_arch {
 	ulong dawr1;
 	ulong dawrx1;
 	ulong dexcr;
+	ulong hashkeyr;
 	ulong ciabr;
 	ulong cfar;
 	ulong ppr;

diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
@@ -646,6 +646,7 @@ struct kvm_ppc_cpu_char {
 #define KVM_REG_PPC_DAWR1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc4)
 #define KVM_REG_PPC_DAWRX1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc5)
 #define KVM_REG_PPC_DEXCR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc6)
+#define KVM_REG_PPC_HASHKEYR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc7)
 
 /* 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
@@ -2352,6 +2352,9 @@ static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
 	case KVM_REG_PPC_DEXCR:
 		*val = get_reg_val(id, kvmppc_get_dexcr_hv(vcpu));
 		break;
+	case KVM_REG_PPC_HASHKEYR:
+		*val = get_reg_val(id, kvmppc_get_hashkeyr_hv(vcpu));
+		break;
 	case KVM_REG_PPC_CIABR:
 		*val = get_reg_val(id, kvmppc_get_ciabr_hv(vcpu));
 		break;
@@ -2598,6 +2601,9 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
 	case KVM_REG_PPC_DEXCR:
 		kvmppc_set_dexcr_hv(vcpu, set_reg_val(id, *val));
 		break;
+	case KVM_REG_PPC_HASHKEYR:
+		kvmppc_set_hashkeyr_hv(vcpu, set_reg_val(id, *val));
+		break;
 	case KVM_REG_PPC_CIABR:
 		kvmppc_set_ciabr_hv(vcpu, set_reg_val(id, *val));
 		/* Don't allow setting breakpoints in hypervisor code */

diff --git a/arch/powerpc/kvm/book3s_hv.h b/arch/powerpc/kvm/book3s_hv.h
@@ -117,6 +117,7 @@ KVMPPC_BOOK3S_HV_VCPU_ACCESSOR(dawr1, 64, KVMPPC_GSID_DAWR1)
 KVMPPC_BOOK3S_HV_VCPU_ACCESSOR(dawrx0, 64, KVMPPC_GSID_DAWRX0)
 KVMPPC_BOOK3S_HV_VCPU_ACCESSOR(dawrx1, 64, KVMPPC_GSID_DAWRX1)
 KVMPPC_BOOK3S_HV_VCPU_ACCESSOR(dexcr, 64, KVMPPC_GSID_DEXCR)
+KVMPPC_BOOK3S_HV_VCPU_ACCESSOR(hashkeyr, 64, KVMPPC_GSID_HASHKEYR)
 KVMPPC_BOOK3S_HV_VCPU_ACCESSOR(ciabr, 64, KVMPPC_GSID_CIABR)
 KVMPPC_BOOK3S_HV_VCPU_ACCESSOR(wort, 64, KVMPPC_GSID_WORT)
 KVMPPC_BOOK3S_HV_VCPU_ACCESSOR(ppr, 64, KVMPPC_GSID_PPR)