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Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support |
Date: |
Thu, 19 Jun 2014 23:47:34 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Jun 19, 2014 at 12:34:24PM -0700, Sanjay Lal wrote:
>
> On Jun 19, 2014, at 9:27 AM, Aurelien Jarno <address@hidden> wrote:
>
> > On Tue, Jun 17, 2014 at 11:10:35PM +0100, James Hogan wrote:
> >> In KVM mode the bootrom is loaded and executed from the last 1MB of
> >> DRAM.
> >
> > What is the reason for that? I am not opposed to that, but if it is
> > really needed, it means that loading a bootloader into the flash area
> > (for example YAMON) won't work and that this should be forbidden to the
> > user.
> >
>
> In trap and emulate mode, both the kernel and userland run in user mode on
> the processor. Virtual addresses >= 0x80000000 are only accessible in kernel
> mode, and the default flash area (VA: 0xbfc00000/PA: 0x1fc00000) falls in
> this range.
>
> We therefore decided to relocate the bootloader to the last 1MB of RAM. This
> area is excluded from the RAM ranges supplied to the kernel, so it should not
> be accessible to the user.
>
Thanks for the explanation. It means we should disable the support for
booting from the flash (using -pflash) in KVM mode, as it would simply
not work.
--
Aurelien Jarno GPG: 4096R/1DDD8C9B
address@hidden http://www.aurel32.net
- [Qemu-devel] [PATCH v5 12/12] MAINTAINERS: Add entry for MIPS KVM, (continued)
- [Qemu-devel] [PATCH v5 12/12] MAINTAINERS: Add entry for MIPS KVM, James Hogan, 2014/06/17
- [Qemu-devel] [PATCH v5 07/12] target-mips: kvm: Add main KVM support for MIPS, James Hogan, 2014/06/17
- [Qemu-devel] [PATCH v5 03/12] hw/mips: Add API to convert KVM guest KSEG0 <-> GPA, James Hogan, 2014/06/17
- [Qemu-devel] [PATCH v5 11/12] target-mips: Enable KVM support in build system, James Hogan, 2014/06/17
- [Qemu-devel] [PATCH v5 05/12] target-mips: get_physical_address: Add KVM awareness, James Hogan, 2014/06/17
- [Qemu-devel] [PATCH v5 06/12] kvm: Allow arch to set sigmask length, James Hogan, 2014/06/17
- [Qemu-devel] [PATCH v5 01/12] target-mips: Reset CPU timer consistently, James Hogan, 2014/06/17
- [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, James Hogan, 2014/06/17
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, Aurelien Jarno, 2014/06/19
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, Sanjay Lal, 2014/06/20
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support,
Aurelien Jarno <=
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, Paolo Bonzini, 2014/06/20
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, James Hogan, 2014/06/20
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, Aurelien Jarno, 2014/06/20
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, Paolo Bonzini, 2014/06/20
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, Aurelien Jarno, 2014/06/20
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, James Hogan, 2014/06/20
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, James Hogan, 2014/06/20
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, Paolo Bonzini, 2014/06/20
- Re: [Qemu-devel] [PATCH v5 10/12] hw/mips: malta: Add KVM support, Aurelien Jarno, 2014/06/20
[Qemu-devel] [PATCH v5 09/12] hw/mips: In KVM mode, inject IRQ2 (I/O) interrupts via ioctls, James Hogan, 2014/06/17