From: "Michael S. Tsirkin" <mst@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v4 4/7] pc: fix QEMU crashing when more than ~50 memory hotplugged
Date: Thu, 9 Jul 2015 16:46:43 +0300 [thread overview]
Message-ID: <20150709164336-mutt-send-email-mst@redhat.com> (raw)
In-Reply-To: <559E7A65.6080908@redhat.com>
On Thu, Jul 09, 2015 at 03:43:01PM +0200, Paolo Bonzini wrote:
>
>
> On 09/07/2015 15:06, Michael S. Tsirkin wrote:
> > > QEMU asserts in vhost due to hitting vhost backend limit
> > > on number of supported memory regions.
> > >
> > > Describe all hotplugged memory as one continuos range
> > > to vhost with linear 1:1 HVA->GPA mapping in backend.
> > >
> > > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> >
> > Hmm - a bunch of work here to recombine MRs that memory listener
> > interface breaks up. In particular KVM could benefit from this too (on
> > workloads that change the table a lot). Can't we teach memory core to
> > pass hva range as a single continuous range to memory listeners?
>
> Memory listeners are based on memory regions, not HVA ranges.
>
> Paolo
Many listeners care about HVA ranges. I know KVM and vhost do.
I guess we could create dummy MRs to fill in the holes left by
memory hotplug? vhost already has logic to recombine
consequitive chunks created by memory core.
--
MST
next prev parent reply other threads:[~2015-07-09 13:46 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-09 11:47 [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 1/7] memory: get rid of memory_region_destructor_ram_from_ptr() Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 2/7] memory: introduce MemoryRegion container with reserved HVA range Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 3/7] pc: reserve hotpluggable memory range with memory_region_init_hva_range() Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 4/7] pc: fix QEMU crashing when more than ~50 memory hotplugged Igor Mammedov
2015-07-09 13:06 ` Michael S. Tsirkin
2015-07-09 13:43 ` Paolo Bonzini
2015-07-09 13:46 ` Michael S. Tsirkin [this message]
2015-07-10 10:12 ` Igor Mammedov
2015-07-13 6:55 ` Michael S. Tsirkin
2015-07-13 18:55 ` Igor Mammedov
2015-07-13 20:14 ` Michael S. Tsirkin
2015-07-14 13:02 ` Igor Mammedov
2015-07-14 13:14 ` Michael S. Tsirkin
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 5/7] exec: make sure that RAMBlock descriptor won't be leaked Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 6/7] exec: add qemu_ram_unmap_hva() API for unmapping memory from HVA area Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 7/7] memory: add support for deleting HVA mapped MemoryRegion Igor Mammedov
2015-07-15 15:12 ` [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on Igor Mammedov
2015-07-15 16:32 ` Michael S. Tsirkin
2015-07-16 7:26 ` Igor Mammedov
2015-07-16 7:35 ` Michael S. Tsirkin
2015-07-16 9:42 ` Igor Mammedov
2015-07-16 10:24 ` Michael S. Tsirkin
2015-07-16 11:11 ` Igor Mammedov
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