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Re: [PATCH v2 2/3] memory: Allow a MemoryRegion to be marked no_vhost
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [PATCH v2 2/3] memory: Allow a MemoryRegion to be marked no_vhost |
Date: |
Tue, 14 Jan 2020 11:26:08 +0000 |
User-agent: |
Mutt/1.13.0 (2019-11-30) |
* Michael S. Tsirkin (address@hidden) wrote:
> On Mon, Jan 13, 2020 at 05:36:46PM +0000, Dr. David Alan Gilbert (git) wrote:
> > From: "Dr. David Alan Gilbert" <address@hidden>
> >
> > Allow a memory region to be marked as 'no_vhost' and
> > exclude that region from vhost's list build.
> >
> > Signed-off-by: Dr. David Alan Gilbert <address@hidden>
>
> I thought we agreed vfio needs this as well?
> I'd rather this had some meaning not just "no vhost" ...
> no_dma?
VFIO tends to be unplugged on migration anyway (at the moment);
but I'm happy to change the name if everyone is happy with the rest of
the series and we can agree on the new name,
Dave
> > ---
> > hw/virtio/vhost.c | 3 ++-
> > include/exec/memory.h | 21 +++++++++++++++++++++
> > memory.c | 15 +++++++++++++++
> > 3 files changed, 38 insertions(+), 1 deletion(-)
> >
> > diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
> > index 774d87d98e..462498bfe6 100644
> > --- a/hw/virtio/vhost.c
> > +++ b/hw/virtio/vhost.c
> > @@ -402,7 +402,8 @@ static bool vhost_section(struct vhost_dev *dev,
> > MemoryRegionSection *section)
> > bool log_dirty = memory_region_get_dirty_log_mask(section->mr) &
> > ~(1 << DIRTY_MEMORY_MIGRATION);
> > result = memory_region_is_ram(section->mr) &&
> > - !memory_region_is_rom(section->mr);
> > + !memory_region_is_rom(section->mr) &&
> > + !memory_region_get_no_vhost(section->mr);
> >
> > /* Vhost doesn't handle any block which is doing dirty-tracking other
> > * than migration; this typically fires on VGA areas.
> > diff --git a/include/exec/memory.h b/include/exec/memory.h
> > index aef8123d48..f475c06d63 100644
> > --- a/include/exec/memory.h
> > +++ b/include/exec/memory.h
> > @@ -394,6 +394,7 @@ struct MemoryRegion {
> > bool ram_device;
> > bool enabled;
> > bool warning_printed; /* For reservations */
> > + bool no_vhost;
> > uint8_t vga_logging_count;
> > MemoryRegion *alias;
> > hwaddr alias_offset;
> > @@ -1625,6 +1626,26 @@ void memory_region_set_readonly(MemoryRegion *mr,
> > bool readonly);
> > */
> > void memory_region_set_nonvolatile(MemoryRegion *mr, bool nonvolatile);
> >
> > +/**
> > + * memory_region_set_no_vhost: Make vhost ignore a memory region
> > + *
> > + * Makes vhost ignore a memory region, useful if it isn't real
> > + * DMAble memory and is at inconvenient addresses
> > + *
> > + * @mr: the region being updated.
> > + * @no_vhost: true to ignore
> > + */
> > +void memory_region_set_no_vhost(MemoryRegion *mr, bool no_vhost);
> > +
> > +/**
> > + * memory_region_set_no_vhost: Test if memory region is marked no vhost
> > + *
> > + * Test if the no_vhost flag is set on the memory region
> > + *
> > + * @mr: the region being tested.
> > + */
> > +bool memory_region_get_no_vhost(const MemoryRegion *mr);
> > +
> > /**
> > * memory_region_rom_device_set_romd: enable/disable ROMD mode
> > *
> > diff --git a/memory.c b/memory.c
> > index d7b9bb6951..9371998e30 100644
> > --- a/memory.c
> > +++ b/memory.c
> > @@ -2136,6 +2136,21 @@ void memory_region_set_nonvolatile(MemoryRegion *mr,
> > bool nonvolatile)
> > }
> > }
> >
> > +void memory_region_set_no_vhost(MemoryRegion *mr, bool no_vhost)
> > +{
> > + if (mr->no_vhost != no_vhost) {
> > + memory_region_transaction_begin();
> > + mr->no_vhost = no_vhost;
> > + memory_region_update_pending |= mr->enabled;
> > + memory_region_transaction_commit();
> > + }
> > +}
> > +
> > +bool memory_region_get_no_vhost(const MemoryRegion *mr)
> > +{
> > + return mr->no_vhost;
> > +}
> > +
> > void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode)
> > {
> > if (mr->romd_mode != romd_mode) {
> > --
> > 2.24.1
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK