Hi Suzuki,
On 27/03/18 14:15, Suzuki K Poulose wrote:
Specify the physical size for the VM encoded in the vm type.
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
---
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
Once the IOCTL is agreed, I think you would need to update
include/linux/kvm.h.
+
+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;
FWIW, older Linux will not accept a KVM type other than 0. So I think
the best would be to bail out if KVM_ARM_GET_MAX_VM_PHYS_SHIFT does not
exist.
For safety, you could even check that arch.phys_shift is always 40 when
running under older Linux.
Cheers,
--
Julien Grall
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