linux-kernel - [kvmtool PATCH 21/17] kvmtool: arm: Add support for creating VM with PA size

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Message-Id: <1522156531-28348-22-git-send-email-suzuki.poulose@arm.com>
Date:   Tue, 27 Mar 2018 14:15:31 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, cdall@...nel.org, marc.zyngier@....com,
        punit.agrawal@....com, will.deacon@....com,
        catalin.marinas@....com, pbonzini@...hat.com, rkrcmar@...hat.com,
        ard.biesheuvel@...aro.org, peter.maydell@...aro.org,
        kristina.martsenko@....com, mark.rutland@....com,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [kvmtool PATCH 21/17] 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                         | 21 +++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/arm/include/arm-common/kvm-arch.h b/arm/include/arm-common/kvm-arch.h
index ca7ab0f..64bc92a 100644
--- a/arm/include/arm-common/kvm-arch.h
+++ b/arm/include/arm-common/kvm-arch.h
@@ -42,7 +42,11 @@
 
 #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 5701d41..a9a9140 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 +20,25 @@ struct kvm_ext kvm_req_ext[] = {
 	{ 0, 0 },
 };
 
+#ifndef KVM_ARM_GET_MAX_VM_PHYS_SHIFT
+#define KVM_ARM_GET_MAX_VM_PHYS_SHIFT		_IO(KVMIO, 0x0a)
+#endif
+
+void kvm__arch_init_hyp(struct kvm *kvm)
+{
+	unsigned max_ipa;
+
+	max_ipa = ioctl(kvm->sys_fd, KVM_ARM_GET_MAX_VM_PHYS_SHIFT);
+	if (max_ipa < 0)
+		max_ipa = 40;
+	if (!kvm->cfg.arch.phys_shift)
+		kvm->cfg.arch.phys_shift = 40;
+	if (kvm->cfg.arch.phys_shift > max_ipa)
+		die("Requested PA size (%u) is not supported by the host (%ubits)\n",
+		    kvm->cfg.arch.phys_shift, max_ipa);
+	kvm_arm_type = kvm->cfg.arch.phys_shift;
+}
+
 bool kvm__arch_cpu_supports_vm(void)
 {
 	/* The KVM capability check is enough. */
-- 
1.9.1