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KVM: MIPS: Add 64BIT capability

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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 <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: "Radim Krčmář" <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
This commit is contained in:
James Hogan 2017-03-14 10:15:20 +00:00
commit 578fd61d2d
2 changed files with 26 additions and 0 deletions
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25
Documentation/virtual/kvm/api.txt
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@ -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.