linux-kernel - [RFC 35/48] RISC-V: KVM: Add TVM init/destroy calls

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Date:   Wed, 19 Apr 2023 15:17:03 -0700
From:   Atish Patra <atishp@...osinc.com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atishp@...osinc.com>, Alexandre Ghiti <alex@...ti.fr>,
        Andrew Jones <ajones@...tanamicro.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Björn Töpel <bjorn@...osinc.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-coco@...ts.linux.dev, Dylan Reid <dylan@...osinc.com>,
        abrestic@...osinc.com, Samuel Ortiz <sameo@...osinc.com>,
        Christoph Hellwig <hch@...radead.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guo Ren <guoren@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
        Jiri Slaby <jirislaby@...nel.org>,
        kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        Mayuresh Chitale <mchitale@...tanamicro.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rajnesh Kanwal <rkanwal@...osinc.com>,
        Uladzislau Rezki <urezki@...il.com>
Subject: [RFC 35/48] RISC-V: KVM: Add TVM init/destroy calls

A TVM can only be created upon explicit request from the VMM via
the vm type if CoVE SBI extensions must supported by the TSM.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/kvm/vm.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c
index 1b59a8f..8a1460d 100644
--- a/arch/riscv/kvm/vm.c
+++ b/arch/riscv/kvm/vm.c
@@ -42,6 +42,19 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 		return r;
 	}
 
+	if (unlikely(type == KVM_VM_TYPE_RISCV_COVE)) {
+		if (!kvm_riscv_cove_enabled()) {
+			kvm_err("Unable to init CoVE VM because cove is not enabled\n");
+			return -EPERM;
+		}
+
+		r = kvm_riscv_cove_vm_init(kvm);
+		if (r)
+			return r;
+		kvm->arch.vm_type = type;
+		kvm_info("Trusted VM instance init successful\n");
+	}
+
 	kvm_riscv_aia_init_vm(kvm);
 
 	kvm_riscv_guest_timer_init(kvm);
@@ -54,6 +67,9 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
 	kvm_destroy_vcpus(kvm);
 
 	kvm_riscv_aia_destroy_vm(kvm);
+
+	if (unlikely(is_cove_vm(kvm)))
+		kvm_riscv_cove_vm_destroy(kvm);
 }
 
 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irql,
-- 
2.25.1