linux-kernel - [RFC 33/48] RISC-V: KVM: Hookup TVM VCPU init/destroy

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Date:   Wed, 19 Apr 2023 15:17:01 -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 33/48] RISC-V: KVM: Hookup TVM VCPU init/destroy

The TVM VCPU create function requires the vcpu id which is generated
after the arch_create_vcpu returns. Thus, TVM vcpu init can not be
invoked from the arch_create_vcpu. Invoke it in post create for now.
However, post create doesn't return any error which is problematic
as vcpu creation can fail from TSM side.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/kvm/vcpu.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index 65f87e1..005c7c9 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -218,6 +218,17 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 {
+	int rc;
+	/*
+	 * TODO: Ideally it should be invoked in vcpu_create. but vcpu_idx
+	 * is allocated after returning create_vcpu. Find a better place to do it
+	 */
+	if (unlikely(is_cove_vcpu(vcpu))) {
+		rc = kvm_riscv_cove_vcpu_init(vcpu);
+		if (rc)
+			pr_err("%s: cove vcpu init failed %d\n", __func__, rc);
+	}
+
 	/**
 	 * vcpu with id 0 is the designated boot cpu.
 	 * Keep all vcpus with non-zero id in power-off state so that
@@ -237,6 +248,9 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 
 	kvm_riscv_vcpu_pmu_deinit(vcpu);
 
+	if (unlikely(is_cove_vcpu(vcpu)))
+		kvm_riscv_cove_vcpu_destroy(vcpu);
+
 	/* Free unused pages pre-allocated for G-stage page table mappings */
 	kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
 }
-- 
2.25.1