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Re: [PATCH 10/18] KVM/MIPS32-VZ: Add API for VZ-ASE Capability

To: Paolo Bonzini <>, Sanjay Lal <>
Subject: Re: [PATCH 10/18] KVM/MIPS32-VZ: Add API for VZ-ASE Capability
From: David Daney <>
Date: Thu, 30 May 2013 10:07:43 -0700
Cc:,, Ralf Baechle <>, Gleb Natapov <>, Marcelo Tosatti <>
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On 05/28/2013 09:34 AM, Paolo Bonzini wrote:
Il 19/05/2013 07:47, Sanjay Lal ha scritto:
- Add API to allow clients (QEMU etc.) to check whether the H/W
   supports the MIPS VZ-ASE.

Why does this matter to userspace?  Do the userspace have some way to
detect if the kernel is unmodified or minimally-modified?

There are (will be) two types of VM presented by MIPS KVM:

1) That provided by the initial patch where a faux-MIPS is emulated and all kernel code must be in the USEG address space.

2) Real MIPS, addressing works as per the architecture specification.

Presumably the user-space client would like to know which of these are supported, as well as be able to select the desired model.

I don't know the best way to do this, but I agree that KVM_CAP_MIPS_VZ_ASE is probably not the best name for it.

My idea was to have the arg of the KVM_CREATE_VM ioctl specify the desired style

David Daney


Signed-off-by: Sanjay Lal <>
  include/uapi/linux/kvm.h | 1 +
  1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index a5c86fc..5889e976 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -666,6 +666,7 @@ struct kvm_ppc_smmu_info {
  #define KVM_CAP_IRQ_MPIC 90
  #define KVM_CAP_PPC_RTAS 91
  #define KVM_CAP_IRQ_XICS 92
+#define KVM_CAP_MIPS_VZ_ASE 93


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