linux-kernel - [PATCH 3/6] KVM: PPC: Book3S HV nestedv2: Keep nested guest DEXCR in sync

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Date: Mon, 03 Jun 2024 11:14:31 +0000
From: Shivaprasad G Bhat <sbhat@...ux.ibm.com>
To: kvm@...r.kernel.org, linux-doc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Cc: pbonzini@...hat.com, naveen.n.rao@...ux.ibm.com,
        christophe.leroy@...roup.eu, corbet@....net, mpe@...erman.id.au,
        namhyung@...nel.org, npiggin@...il.com, pbonzini@...hat.com,
        sbhat@...ux.ibm.com, jniethe5@...il.com, atrajeev@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/6] KVM: PPC: Book3S HV nestedv2: Keep nested guest DEXCR in
 sync

The nestedv2 APIs has the guest state element defined for DEXCR
for the save-restore with L0. However, its ignored in the code.

The patch takes care of this for the DEXCR GSID.

Signed-off-by: Shivaprasad G Bhat <sbhat@...ux.ibm.com>
---
 arch/powerpc/include/asm/kvm_host.h   |    1 +
 arch/powerpc/kvm/book3s_hv.h          |    1 +
 arch/powerpc/kvm/book3s_hv_nestedv2.c |    6 ++++++
 3 files changed, 8 insertions(+)

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 8abac532146e..1e2fdcbecffd 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -599,6 +599,7 @@ struct kvm_vcpu_arch {
 	ulong dawrx0;
 	ulong dawr1;
 	ulong dawrx1;
+	ulong dexcr;
 	ulong ciabr;
 	ulong cfar;
 	ulong ppr;
diff --git a/arch/powerpc/kvm/book3s_hv.h b/arch/powerpc/kvm/book3s_hv.h
index 47b2c815641e..7b0fd282fe95 100644
--- a/arch/powerpc/kvm/book3s_hv.h
+++ b/arch/powerpc/kvm/book3s_hv.h
@@ -116,6 +116,7 @@ KVMPPC_BOOK3S_HV_VCPU_ACCESSOR(dawr0, 64, KVMPPC_GSID_DAWR0)
 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(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)
diff --git a/arch/powerpc/kvm/book3s_hv_nestedv2.c b/arch/powerpc/kvm/book3s_hv_nestedv2.c
index 1091f7a83b25..d207a6d936ff 100644
--- a/arch/powerpc/kvm/book3s_hv_nestedv2.c
+++ b/arch/powerpc/kvm/book3s_hv_nestedv2.c
@@ -193,6 +193,9 @@ static int gs_msg_ops_vcpu_fill_info(struct kvmppc_gs_buff *gsb,
 		case KVMPPC_GSID_DAWRX1:
 			rc = kvmppc_gse_put_u32(gsb, iden, vcpu->arch.dawrx1);
 			break;
+		case KVMPPC_GSID_DEXCR:
+			rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.dexcr);
+			break;
 		case KVMPPC_GSID_CIABR:
 			rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.ciabr);
 			break;
@@ -441,6 +444,9 @@ static int gs_msg_ops_vcpu_refresh_info(struct kvmppc_gs_msg *gsm,
 		case KVMPPC_GSID_DAWRX1:
 			vcpu->arch.dawrx1 = kvmppc_gse_get_u32(gse);
 			break;
+		case KVMPPC_GSID_DEXCR:
+			vcpu->arch.dexcr = kvmppc_gse_get_u64(gse);
+			break;
 		case KVMPPC_GSID_CIABR:
 			vcpu->arch.ciabr = kvmppc_gse_get_u64(gse);
 			break;