From: Paolo Bonzini <pbonzini@redhat.com>
To: Aurelien Jarno <aurelien@aurel32.net>
Cc: Sanjay Lal <sanjayl@kymasys.com>,
James Hogan <james.hogan@imgtec.com>,
qemu-devel@nongnu.org, Peter Maydell <peter.maydell@linaro.org>,
kvm@vger.kernel.org, Gleb Natapov <gleb@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support
Date: Fri, 20 Jun 2014 12:38:30 +0200 [thread overview]
Message-ID: <53A40F26.7040902@redhat.com> (raw)
In-Reply-To: <20140620091047.GC13901@ohm.rr44.fr>
Il 20/06/2014 11:10, Aurelien Jarno ha scritto:
> > My idea was to add a machines-specific option umkernel=on, and require it
> > in order to run KVM. Later we can add umkernel=on support for TCG as well,
> > while umkernel=off with KVM requires virtualization extensions.
> >
> > The same option can disable pflash boot.
> >
> > What do you think?
>
> For what I understand the current KVM support in MIPS uses trap and
> emulate and thus doesn't need hardware support, just a recent kernel
> with the option enabled.
Yes, but work to support virtualization extensions is underway. Patches
were posted a few months ago.
> That's why I do wonder if there is a real point
> in supporting UM kernels in TCG mode.
Debugging, mainly. It is sometimes useful to compare TCG with KVM on
x86, and I suppose it could be the same on MIPS.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Aurelien Jarno <aurelien@aurel32.net>
Cc: Peter Maydell <peter.maydell@linaro.org>,
James Hogan <james.hogan@imgtec.com>,
kvm@vger.kernel.org, Gleb Natapov <gleb@redhat.com>,
qemu-devel@nongnu.org, Sanjay Lal <sanjayl@kymasys.com>
Subject: Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support
Date: Fri, 20 Jun 2014 12:38:30 +0200 [thread overview]
Message-ID: <53A40F26.7040902@redhat.com> (raw)
In-Reply-To: <20140620091047.GC13901@ohm.rr44.fr>
Il 20/06/2014 11:10, Aurelien Jarno ha scritto:
> > My idea was to add a machines-specific option umkernel=on, and require it
> > in order to run KVM. Later we can add umkernel=on support for TCG as well,
> > while umkernel=off with KVM requires virtualization extensions.
> >
> > The same option can disable pflash boot.
> >
> > What do you think?
>
> For what I understand the current KVM support in MIPS uses trap and
> emulate and thus doesn't need hardware support, just a recent kernel
> with the option enabled.
Yes, but work to support virtualization extensions is underway. Patches
were posted a few months ago.
> That's why I do wonder if there is a real point
> in supporting UM kernels in TCG mode.
Debugging, mainly. It is sometimes useful to compare TCG with KVM on
x86, and I suppose it could be the same on MIPS.
Paolo
next prev parent reply other threads:[~2014-06-20 10:38 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-17 22:10 [PATCH v5 00/12] KVM Support for MIPS32 Processors James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 01/12] target-mips: Reset CPU timer consistently James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 02/12] hw/mips/cputimer: Don't start periodic timer in KVM mode James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 03/12] hw/mips: Add API to convert KVM guest KSEG0 <-> GPA James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 04/12] target-mips: get_physical_address: Add defines for segment bases James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 05/12] target-mips: get_physical_address: Add KVM awareness James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 06/12] kvm: Allow arch to set sigmask length James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 07/12] target-mips: kvm: Add main KVM support for MIPS James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 08/12] target-mips: Call kvm_mips_reset_vcpu() from mips_cpu_reset() James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 09/12] hw/mips: In KVM mode, inject IRQ2 (I/O) interrupts via ioctls James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 10/12] hw/mips: malta: Add KVM support James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-19 16:27 ` Aurelien Jarno
2014-06-19 16:27 ` [Qemu-devel] " Aurelien Jarno
2014-06-19 19:34 ` Sanjay Lal
2014-06-19 19:34 ` Sanjay Lal
2014-06-19 21:47 ` Aurelien Jarno
2014-06-19 21:47 ` Aurelien Jarno
2014-06-20 6:07 ` Paolo Bonzini
2014-06-20 6:07 ` [Qemu-devel] " Paolo Bonzini
2014-06-20 8:46 ` James Hogan
2014-06-20 8:46 ` James Hogan
2014-06-20 9:10 ` Aurelien Jarno
2014-06-20 9:10 ` Aurelien Jarno
2014-06-20 10:38 ` Paolo Bonzini [this message]
2014-06-20 10:38 ` Paolo Bonzini
2014-06-20 11:19 ` Aurelien Jarno
2014-06-20 11:19 ` Aurelien Jarno
2014-06-20 11:28 ` James Hogan
2014-06-20 11:28 ` James Hogan
2014-06-20 9:25 ` James Hogan
2014-06-20 9:25 ` James Hogan
2014-06-20 11:11 ` Paolo Bonzini
2014-06-20 11:11 ` Paolo Bonzini
2014-06-20 11:20 ` Aurelien Jarno
2014-06-20 11:20 ` [Qemu-devel] " Aurelien Jarno
2014-06-17 22:10 ` [PATCH v5 11/12] target-mips: Enable KVM support in build system James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-17 22:10 ` [PATCH v5 12/12] MAINTAINERS: Add entry for MIPS KVM James Hogan
2014-06-17 22:10 ` [Qemu-devel] " James Hogan
2014-06-18 15:00 ` [PATCH v5 00/12] KVM Support for MIPS32 Processors Paolo Bonzini
2014-06-18 15:00 ` [Qemu-devel] " Paolo Bonzini
2014-06-19 16:29 ` Aurelien Jarno
2014-06-19 16:29 ` [Qemu-devel] " Aurelien Jarno
2014-07-10 12:17 ` Peter Maydell
2014-07-10 12:17 ` Peter Maydell
2014-07-10 12:47 ` Paolo Bonzini
2014-07-10 12:47 ` Paolo Bonzini
2014-07-14 13:33 ` James Hogan
2014-07-14 13:33 ` James Hogan
2014-07-14 14:35 ` Peter Maydell
2014-07-14 14:35 ` Peter Maydell
2014-07-14 15:50 ` James Hogan
2014-07-14 15:50 ` James Hogan
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