Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Atish Patra <atishp@rivosinc.com>
To:     linux-kernel@vger.kernel.org
Cc:     Atish Patra <atishp@rivosinc.com>, Alexandre Ghiti <alex@ghiti.fr>,
        Andrew Jones <ajones@ventanamicro.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Anup Patel <anup@brainfault.org>,
        Atish Patra <atishp@atishpatra.org>,
        =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= <bjorn@rivosinc.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
        Sean Christopherson <seanjc@google.com>,
        linux-coco@lists.linux.dev, Dylan Reid <dylan@rivosinc.com>,
        abrestic@rivosinc.com, Samuel Ortiz <sameo@rivosinc.com>,
        Christoph Hellwig <hch@infradead.org>,
        Conor Dooley <conor.dooley@microchip.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Guo Ren <guoren@kernel.org>, Heiko Stuebner <heiko@sntech.de>,
        Jiri Slaby <jirislaby@kernel.org>,
        kvm-riscv@lists.infradead.org, kvm@vger.kernel.org,
        linux-mm@kvack.org, linux-riscv@lists.infradead.org,
        Mayuresh Chitale <mchitale@ventanamicro.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Rajnesh Kanwal <rkanwal@rivosinc.com>,
        Uladzislau Rezki <urezki@gmail.com>
Subject: [RFC 19/48] RISC-V: KVM: Register memory regions as confidential for TVMs
Date:   Wed, 19 Apr 2023 15:16:47 -0700
Message-Id: <20230419221716.3603068-20-atishp@rivosinc.com>
In-Reply-To: <20230419221716.3603068-1-atishp@rivosinc.com>
References: <20230419221716.3603068-1-atishp@rivosinc.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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@rivosinc.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