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[Qemu-devel] Re: [PATCH 10/10] introduce qemu_ram_map
From: |
Marcelo Tosatti |
Subject: |
[Qemu-devel] Re: [PATCH 10/10] introduce qemu_ram_map |
Date: |
Tue, 27 Apr 2010 11:49:26 -0300 |
User-agent: |
Mutt/1.5.20 (2009-08-17) |
On Tue, Apr 27, 2010 at 08:28:15AM -0600, Cam Macdonell wrote:
> On Mon, Apr 26, 2010 at 12:54 PM, Anthony Liguori <address@hidden> wrote:
> > On 04/26/2010 01:49 PM, Marcelo Tosatti wrote:
> >>
> >> On Mon, Apr 26, 2010 at 01:27:30PM -0500, Anthony Liguori wrote:
> >>
> >>>
> >>> On 04/26/2010 12:59 PM, Marcelo Tosatti wrote:
> >>>
> >>>>
> >>>> Which allows drivers to register an mmaped region into ram block
> >>>> mappings.
> >>>> To be used by device assignment driver.
> >>>>
> >>>
> >>> This doesn't make much sense to me.
> >>>
> >>> Do you use this like:
> >>>
> >>> qemu_ram_map(64k, ptr);
> >>> assert(qemu_ram_alloc(64k) == ptr);
> >>>
> >>
> >> No. hw/device-assignment.c in qemu-kvm mmaps
> >> /sys/bus/pci/devices/x:y:z/resourcen (the PCI devices memory regions) to
> >> the guest.
> >>
> >
> > I understand, but how do you use qemu_ram_map() to actually map that memory
> > to a given PCI device resource? I assume you rely on it getting put on the
> > front of the list so that the next qemu_ram_alloc() will be at that
> > location.
>
> In my shared memory patch, I passed the offset returned from
> qemu_ram_mmap to cpu_register_physical_memory from within the map
> function passed to pci_register_bar. Could the same not be done? Is
> there something incorrect with this approach?
No, its correct. Its similar to what hw/device-assignment.c in qemu-kvm
will do.
- Re: [Qemu-devel] Re: [PATCH 06/10] kvm: remove explicit kvm_arch_reset_vcpu from kvm_init_vcpu, (continued)
- [Qemu-devel] [PATCH 03/10] kvm: handle internal error, Marcelo Tosatti, 2010/04/26
- [Qemu-devel] [PATCH 05/10] kvm_init_vcpu requires global lock held, Marcelo Tosatti, 2010/04/26
- [Qemu-devel] [PATCH 04/10] kvm: allow qemu to set EPT identity mapping address, Marcelo Tosatti, 2010/04/26
- [Qemu-devel] [PATCH 08/10] introduce leul_to_cpu, Marcelo Tosatti, 2010/04/26
- [Qemu-devel] [PATCH 10/10] introduce qemu_ram_map, Marcelo Tosatti, 2010/04/26
[Qemu-devel] Re: [PATCH 10/10] introduce qemu_ram_map, Anthony Liguori, 2010/04/26
- [Qemu-devel] Re: [PATCH 10/10] introduce qemu_ram_map, Marcelo Tosatti, 2010/04/26
- [Qemu-devel] Re: [PATCH 10/10] introduce qemu_ram_map, Anthony Liguori, 2010/04/26
- [Qemu-devel] Re: [PATCH 10/10] introduce qemu_ram_map, Marcelo Tosatti, 2010/04/26
- Re: [Qemu-devel] Re: [PATCH 10/10] introduce qemu_ram_map, Anthony Liguori, 2010/04/26
- Re: [Qemu-devel] Re: [PATCH 10/10] introduce qemu_ram_map, Marcelo Tosatti, 2010/04/26
[Qemu-devel] Re: [PATCH 10/10] introduce qemu_ram_map, Cam Macdonell, 2010/04/27
[Qemu-devel] [PATCH 01/10] KVM: x86: Add debug register saving and restoring, Marcelo Tosatti, 2010/04/26
[Qemu-devel] [PATCH 07/10] vga: fix typo in length passed to kvm_log_stop, Marcelo Tosatti, 2010/04/26