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Subject: [PATCH v2 5/8] KVM: PPC: Book3S HV: Add one-reg interface for
 HASHKEYR register
From: Shivaprasad G Bhat <sbhat@linux.ibm.com>
To: kvm@vger.kernel.org, linux-doc@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org
Cc: pbonzini@redhat.com, naveen.n.rao@linux.ibm.com,
        christophe.leroy@csgroup.eu, corbet@lwn.net, mpe@ellerman.id.au,
        namhyung@kernel.org, npiggin@gmail.com, pbonzini@redhat.com,
        sbhat@linux.ibm.com, jniethe5@gmail.com, atrajeev@linux.vnet.ibm.com,
        linux-kernel@vger.kernel.org
Date: Wed, 05 Jun 2024 13:07:15 +0000
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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>
---
 Documentation/virt/kvm/api.rst      |    1 +
 arch/powerpc/include/asm/kvm_host.h |    1 +
 arch/powerpc/include/uapi/asm/kvm.h |    1 +
 arch/powerpc/kvm/book3s_hv.c        |    6 ++++++
 arch/powerpc/kvm/book3s_hv.h        |    1 +
 5 files changed, 10 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 81077c654281..0c22cb4196d8 100644
--- 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
index 1e2fdcbecffd..a0cd9dbf534f 100644
--- 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
index fcb947f65667..23a0af739c78 100644
--- 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
index 1294c6839d37..ccc9564c5a31 100644
--- 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
index 7b0fd282fe95..c073fdfa7dc4 100644
--- 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)