linux-kernel - [RFC 19/48] RISC-V: KVM: Register memory regions as confidential for TVMs

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Message-Id: <20230419221716.3603068-20-atishp@rivosinc.com>
Date:   Wed, 19 Apr 2023 15:16:47 -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 19/48] RISC-V: KVM: Register memory regions as confidential for TVMs

The entire DRAM region of a TVM running in CoVE must be confidential by
default. If a TVM wishes to share any sub-region, the TVM has to
request it explicitly with memory share APIs.

Mark the memory region as confidential during vm create itself.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/kvm/mmu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index 4b0f09e..63889d9 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -499,6 +499,11 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 
 	mmap_read_lock(current->mm);
 
+	if (is_cove_vm(kvm)) {
+		ret = kvm_riscv_cove_vm_add_memreg(kvm, base_gpa, size);
+		if (ret)
+			return ret;
+	}
 	/*
 	 * A memory region could potentially cover multiple VMAs, and
 	 * any holes between them, so iterate over all of them to find
-- 
2.25.1