From: David Daney <ddaney.cavm@gmail.com>
To: Paolo Bonzini <pbonzini@redhat.com>, Sanjay Lal <sanjayl@kymasys.com>
Cc: kvm@vger.kernel.org, linux-mips@linux-mips.org,
Ralf Baechle <ralf@linux-mips.org>,
Gleb Natapov <gleb@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>
Subject: Re: [PATCH 10/18] KVM/MIPS32-VZ: Add API for VZ-ASE Capability
Date: Thu, 30 May 2013 10:07:43 -0700 [thread overview]
Message-ID: <51A7875F.4080606@gmail.com> (raw)
In-Reply-To: <51A4DC99.7040706@redhat.com>
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
> Paolo
>
>> Signed-off-by: Sanjay Lal <sanjayl@kymasys.com>
>> ---
>> 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
>>
>> #ifdef KVM_CAP_IRQ_ROUTING
>>
>>
>
> --
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>
>
next prev parent reply other threads:[~2013-05-30 17:07 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-19 5:47 [PATCH 00/18] KVM/MIPS32: Support for the new Virtualization ASE (VZ-ASE) Sanjay Lal
2013-05-19 5:47 ` [PATCH 01/18] Revert "MIPS: microMIPS: Support dynamic ASID sizing." Sanjay Lal
2013-05-19 5:47 ` [PATCH 02/18] Revert "MIPS: Allow ASID size to be determined at boot time." Sanjay Lal
2013-05-19 5:47 ` [PATCH 03/18] KVM/MIPS32: Export min_low_pfn Sanjay Lal
2013-05-19 5:47 ` [PATCH 04/18] KVM/MIPS32-VZ: MIPS VZ-ASE related register defines and helper macros Sanjay Lal
2013-05-19 5:47 ` [PATCH 05/18] KVM/MIPS32-VZ: VZ-ASE assembler wrapper functions to set GuestIDs Sanjay Lal
2013-05-19 13:36 ` Sergei Shtylyov
2013-05-19 5:47 ` [PATCH 06/18] KVM/MIPS32-VZ: VZ-ASE related callbacks to handle guest exceptions that trap to the Root context Sanjay Lal
2013-05-28 15:04 ` Paolo Bonzini
2013-05-30 18:35 ` Sanjay Lal
2013-05-28 16:14 ` Paolo Bonzini
2013-05-30 18:35 ` Sanjay Lal
2013-05-30 20:11 ` Paolo Bonzini
2013-05-31 1:56 ` Sanjay Lal
2013-05-19 5:47 ` [PATCH 07/18] KVM/MIPS32: VZ-ASE related CPU feature flags and options Sanjay Lal
2013-05-19 5:47 ` [PATCH 08/18] KVM/MIPS32-VZ: Entry point for trampolining to the guest and trap handlers Sanjay Lal
2013-05-28 14:43 ` Paolo Bonzini
2013-05-19 5:47 ` [PATCH 09/18] KVM/MIPS32-VZ: Add support for CONFIG_KVM_MIPS_VZ option Sanjay Lal
2013-05-19 5:47 ` [PATCH 10/18] KVM/MIPS32-VZ: Add API for VZ-ASE Capability Sanjay Lal
2013-05-28 16:34 ` Paolo Bonzini
2013-05-30 17:07 ` David Daney [this message]
2013-05-30 17:51 ` Paolo Bonzini
2013-05-30 18:35 ` David Daney
2013-05-30 18:30 ` Sanjay Lal
2013-05-19 5:47 ` [PATCH 11/18] KVM/MIPS32-VZ: VZ: Handle Guest TLB faults that are handled in Root context Sanjay Lal
2013-05-19 5:47 ` [PATCH 12/18] KVM/MIPS32-VZ: VM Exit Stats, add VZ exit reasons Sanjay Lal
2013-05-19 5:47 ` [PATCH 13/18] KVM/MIPS32-VZ: Top level handler for Guest faults Sanjay Lal
2013-05-19 5:47 ` [PATCH 14/18] KVM/MIPS32-VZ: Guest exception batching support Sanjay Lal
2013-05-19 5:47 ` [PATCH 15/18] KVM/MIPS32: Add dummy trap handler to catch unexpected exceptions and dump out useful info Sanjay Lal
2013-05-19 5:47 ` [PATCH 16/18] KVM/MIPS32-VZ: Add VZ-ASE support to KVM/MIPS data structures Sanjay Lal
2013-05-28 15:24 ` Paolo Bonzini
2013-05-19 5:47 ` [PATCH 17/18] KVM/MIPS32: Revert to older method for accessing ASID parameters Sanjay Lal
2013-05-19 5:47 ` [PATCH 18/18] KVM/MIPS32-VZ: Dump out additional info about VZ features as part of /proc/cpuinfo Sanjay Lal
2013-05-20 15:50 ` [PATCH 00/18] KVM/MIPS32: Support for the new Virtualization ASE (VZ-ASE) David Daney
2013-05-20 16:58 ` Sanjay Lal
2013-05-20 17:29 ` David Daney
2013-05-20 17:34 ` Sanjay Lal
2013-05-20 18:36 ` Maciej W. Rozycki
2013-05-20 18:58 ` David Daney
2013-05-27 12:45 ` Maciej W. Rozycki
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