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kvm: exclude ioeventfd from counting kvm_io_range limit

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We can easily reach the 1000 limit by start VM with a couple
hundred I/O devices (multifunction=on). The hardcode limit
already been adjusted 3 times (6 ~ 200 ~ 300 ~ 1000).

In userspace, we already have maximum file descriptor to
limit ioeventfd count. But kvm_io_bus devices also are used
for pit, pic, ioapic, coalesced_mmio. They couldn't be limited
by maximum file descriptor.

Currently only ioeventfds take too much kvm_io_bus devices,
so just exclude it from counting kvm_io_range limit.

Also fixed one indent issue in kvm_host.h

Signed-off-by: Amos Kong <akong@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Amos Kong 2013-05-25 06:44:15 +08:00 • committed by Gleb Natapov
parent 566af9404b
commit 6ea34c9b78
3 changed files with 6 additions and 2 deletions
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3
include/linux/kvm_host.h
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@ -145,7 +145,8 @@ struct kvm_io_range {
#define NR_IOBUS_DEVS 1000
struct kvm_io_bus {
int dev_count;
int dev_count;
int ioeventfd_count;
struct kvm_io_range range[];
};