diff options
| author | James Hogan | 2017-03-14 10:15:20 +0000 |
|---|---|---|
| committer | James Hogan | 2017-03-28 14:53:47 +0100 |
| commit | 578fd61d2d210a3b58dc107f5382b965922ac253 (patch) | |
| tree | 57b7002cc0f04c8586e8820791f74dc86dc73b8c /Documentation/virtual | |
| parent | a8a3c426772e55ae9c3209f061cb6317268f932c (diff) | |
KVM: MIPS: Add 64BIT capability
Add a new KVM_CAP_MIPS_64BIT capability to indicate that 64-bit MIPS
guests are available and supported. In this case it should still be
possible to run 32-bit guest code. If not available it won't be possible
to run 64-bit guest code and the instructions may not be available, or
the kernel may not support full context switching of 64-bit registers.
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 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 4b5fa2571efa..1b8486c094b4 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -4192,3 +4192,28 @@ to KVM_CREATE_VM to create a VM which utilises it. If KVM_CHECK_EXTENSION on a kvm VM handle indicates that this capability is available, it means that the VM is using trap & emulate. + +8.7 KVM_CAP_MIPS_64BIT + +Architectures: mips + +This capability indicates the supported architecture type of the guest, i.e. the +supported register and address width. + +The values returned when this capability is checked by KVM_CHECK_EXTENSION on a +kvm VM handle correspond roughly to the CP0_Config.AT register field, and should +be checked specifically against known values (see below). All other values are +reserved. + + 0: MIPS32 or microMIPS32. + Both registers and addresses are 32-bits wide. + It will only be possible to run 32-bit guest code. + + 1: MIPS64 or microMIPS64 with access only to 32-bit compatibility segments. + Registers are 64-bits wide, but addresses are 32-bits wide. + 64-bit guest code may run but cannot access MIPS64 memory segments. + It will also be possible to run 32-bit guest code. + + 2: MIPS64 or microMIPS64 with access to all address segments. + Both registers and addresses are 64-bits wide. + It will be possible to run 64-bit or 32-bit guest code. |