linux-kernel - [RFC 11/48] RISC-V: KVM: Use the new VM IOCTL for measuring pages

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Date:   Wed, 19 Apr 2023 15:16:39 -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 11/48] RISC-V: KVM: Use the new VM IOCTL for measuring pages

The newly introduced VM IOCTL allow the VMM to measure the pages used
to load the blobs. Hookup the VM ioctl.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/kvm/vm.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c
index 29d3221..1b59a8f 100644
--- a/arch/riscv/kvm/vm.c
+++ b/arch/riscv/kvm/vm.c
@@ -11,6 +11,7 @@
 #include <linux/module.h>
 #include <linux/uaccess.h>
 #include <linux/kvm_host.h>
+#include <asm/kvm_cove.h>
 
 const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
 	KVM_GENERIC_VM_STATS()
@@ -209,5 +210,20 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 long kvm_arch_vm_ioctl(struct file *filp,
 		       unsigned int ioctl, unsigned long arg)
 {
-	return -EINVAL;
+	struct kvm *kvm = filp->private_data;
+	void __user *argp = (void __user *)arg;
+	struct kvm_riscv_cove_measure_region mr;
+
+	switch (ioctl) {
+	case KVM_RISCV_COVE_MEASURE_REGION:
+		if (!is_cove_vm(kvm))
+			return -EINVAL;
+		if (copy_from_user(&mr, argp, sizeof(mr)))
+			return -EFAULT;
+
+		return kvm_riscv_cove_vm_measure_pages(kvm, &mr);
+	default:
+		return -EINVAL;
+	}
+
 }
-- 
2.25.1