linux-kernel - [kvmtool PATCH v6 22/18] kvmtool: arm: Add support for creating VM with PA size

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Date:   Wed, 26 Sep 2018 17:32:58 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
        marc.zyngier@....com, cdall@...nel.org, eric.auger@...hat.com,
        suzuki.poulose@....com, will.deacon@....com, dave.martin@....com,
        peter.maydell@...aro.org, pbonzini@...hat.com, rkrcmar@...hat.com,
        julien.grall@....com, linux-kernel@...r.kernel.org
Subject: [kvmtool PATCH v6 22/18] kvmtool: arm: Add support for creating VM with PA size

Specify the physical size for the VM encoded in the vm type.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 arm/include/arm-common/kvm-arch.h |  6 +++++-
 arm/kvm.c                         | 32 +++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/arm/include/arm-common/kvm-arch.h b/arm/include/arm-common/kvm-arch.h
index b29b4b1..d77f3ac 100644
--- a/arm/include/arm-common/kvm-arch.h
+++ b/arm/include/arm-common/kvm-arch.h
@@ -44,7 +44,11 @@
 
 #define KVM_IRQ_OFFSET		GIC_SPI_IRQ_BASE
 
-#define KVM_VM_TYPE		0
+extern unsigned long		kvm_arm_type;
+extern void kvm__arch_init_hyp(struct kvm *kvm);
+
+#define KVM_VM_TYPE		kvm_arm_type
+#define kvm__arch_init_hyp	kvm__arch_init_hyp
 
 #define VIRTIO_DEFAULT_TRANS(kvm)	\
 	((kvm)->cfg.arch.virtio_trans_pci ? VIRTIO_PCI : VIRTIO_MMIO)
diff --git a/arm/kvm.c b/arm/kvm.c
index eac2ad2..c8db6b3 100644
--- a/arm/kvm.c
+++ b/arm/kvm.c
@@ -11,6 +11,8 @@
 #include <linux/kvm.h>
 #include <linux/sizes.h>
 
+unsigned long kvm_arm_type;
+
 struct kvm_ext kvm_req_ext[] = {
 	{ DEFINE_KVM_EXT(KVM_CAP_IRQCHIP) },
 	{ DEFINE_KVM_EXT(KVM_CAP_ONE_REG) },
@@ -18,6 +20,36 @@ struct kvm_ext kvm_req_ext[] = {
 	{ 0, 0 },
 };
 
+#ifndef KVM_CAP_ARM_VM_IPA_SIZE
+#define KVM_CAP_ARM_VM_IPA_SIZE	159
+#endif
+
+#ifndef KVM_VM_TYPE_ARM_IPA_SIZE
+#define KVM_VM_TYPE_ARM_IPA_SIZE_MASK	0xffULL
+#define KVM_VM_TYPE_ARM_IPA_SIZE(x)	\
+	((x) & KVM_VM_TYPE_ARM_IPA_SIZE_MASK)
+#endif
+
+void kvm__arch_init_hyp(struct kvm *kvm)
+{
+	int max_ipa;
+
+	if (!kvm->cfg.arch.phys_shift)
+		kvm->cfg.arch.phys_shift = 40;
+	if (kvm->cfg.arch.phys_shift == 40)
+		return;
+	max_ipa = ioctl(kvm->sys_fd,
+			KVM_CHECK_EXTENSION, KVM_CAP_ARM_VM_IPA_SIZE);
+	if (!max_ipa)
+		die("Kernel doesn't support IPA size configuration\n");
+	if ((kvm->cfg.arch.phys_shift > max_ipa) ||
+	    (kvm->cfg.arch.phys_shift < 32))
+		die("Requested PA size (%u) is not supported by the host"
+		    " [32 - %u]bit\n",
+		    kvm->cfg.arch.phys_shift, max_ipa);
+	kvm_arm_type = KVM_VM_TYPE_ARM_IPA_SIZE(kvm->cfg.arch.phys_shift);
+}
+
 bool kvm__arch_cpu_supports_vm(void)
 {
 	/* The KVM capability check is enough. */
-- 
2.19.0