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authorJames Hogan <james.hogan@imgtec.com>2017-03-14 13:15:19 +0300
committerJames Hogan <james.hogan@imgtec.com>2017-03-28 16:53:47 +0300
commita8a3c426772e55ae9c3209f061cb6317268f932c (patch)
tree6660fdd30dfb65ab36380cbf12d1dd4993a42bfa /arch/mips/kvm
parenta7244920d1096c267c991a7506a519cdb92d7a24 (diff)
downloadlinux-a8a3c426772e55ae9c3209f061cb6317268f932c.tar.xz
KVM: MIPS: Add VZ & TE capabilities
Add new KVM_CAP_MIPS_VZ and KVM_CAP_MIPS_TE capabilities, and in order to allow MIPS KVM to support VZ without confusing old users (which expect the trap & emulate implementation), define and start checking KVM_CREATE_VM type codes. The codes available are: - KVM_VM_MIPS_TE = 0 This is the current value expected from the user, and will create a VM using trap & emulate in user mode, confined to the user mode address space. This may in future become unavailable if the kernel is only configured to support VZ, in which case the EINVAL error will be returned and KVM_CAP_MIPS_TE won't be available even though KVM_CAP_MIPS_VZ is. - KVM_VM_MIPS_VZ = 1 This can be provided when the KVM_CAP_MIPS_VZ capability is available to create a VM using VZ, with a fully virtualized guest virtual address space. If VZ support is unavailable in the kernel, the EINVAL error will be returned (although old kernels without the KVM_CAP_MIPS_VZ capability may well succeed and create a trap & emulate VM). This is designed to allow the desired implementation (T&E vs VZ) to be potentially chosen at runtime rather than being fixed in the kernel configuration. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org
Diffstat (limited to 'arch/mips/kvm')
-rw-r--r--arch/mips/kvm/mips.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index c507533ef6ea..476ece99bf3b 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -107,6 +107,14 @@ void kvm_arch_check_processor_compat(void *rtn)
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
+ switch (type) {
+ case KVM_VM_MIPS_TE:
+ break;
+ default:
+ /* Unsupported KVM type */
+ return -EINVAL;
+ };
+
/* Allocate page table to map GPA -> RPA */
kvm->arch.gpa_mm.pgd = kvm_pgd_alloc();
if (!kvm->arch.gpa_mm.pgd)
@@ -1038,6 +1046,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_READONLY_MEM:
case KVM_CAP_SYNC_MMU:
case KVM_CAP_IMMEDIATE_EXIT:
+ case KVM_CAP_MIPS_TE:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO: