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be1fea9bc2
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Vincenzo Maffione be1fea9bc2 virtio: read avail_idx from VQ only when necessary 
The virtqueue_pop() implementation needs to check if the avail ring
contains some pending buffers. To perform this check, it is not
always necessary to fetch the avail_idx in the VQ memory, which is
expensive. This patch introduces a shadow variable tracking avail_idx
and modifies virtio_queue_empty() to access avail_idx in physical
memory only when necessary.

Signed-off-by: Vincenzo Maffione <v.maffione@gmail.com>
Message-Id: <b617d6459902773d9f4ab843bfaca764f5af8eda.1450218353.git.v.maffione@gmail.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-02-06 20:44:08 +02:00
..
9pfs virtio: move allocation to virtqueue_pop/vring_pop 2016-02-06 20:39:07 +02:00
acpi log: do not unnecessarily include qom/cpu.h 2016-02-03 09:19:10 +00:00
alpha alpha: Clean up includes 2016-01-29 15:07:23 +00:00
arm hw/arm/virt: Add always-on property to the virt board timer 2016-01-21 14:15:07 +00:00
audio audio: Clean up includes 2016-02-02 13:57:31 +01:00
block virtio: introduce qemu_get/put_virtqueue_element 2016-02-06 20:44:08 +02:00
bt hw: Clean up includes 2016-01-29 15:07:25 +00:00
char virtio: introduce qemu_get/put_virtqueue_element 2016-02-06 20:44:08 +02:00
core hw/core: Clean up includes 2016-01-29 15:07:25 +00:00
cpu hw: Clean up includes 2016-01-29 15:07:25 +00:00
cris cris: Clean up includes 2016-01-29 15:07:24 +00:00
display virtio: move allocation to virtqueue_pop/vring_pop 2016-02-06 20:39:07 +02:00
dma hw: Clean up includes 2016-01-29 15:07:25 +00:00
gpio hw: Clean up includes 2016-01-29 15:07:25 +00:00
i2c hw: Clean up includes 2016-01-29 15:07:25 +00:00
i386 pc: acpi: merge SSDT into DSDT 2016-02-04 19:53:02 +02:00
ide macio: add dma_active to VMStateDescription 2016-01-30 23:37:36 +11:00
input virtio: move allocation to virtqueue_pop/vring_pop 2016-02-06 20:39:07 +02:00
intc hw/intc: Clean up includes 2016-01-29 15:07:24 +00:00
ipack hw: Clean up includes 2016-01-29 15:07:25 +00:00
ipmi hw: Clean up includes 2016-01-29 15:07:25 +00:00
isa hw: Clean up includes 2016-01-29 15:07:25 +00:00
lm32 lm32: Clean up includes 2016-01-29 15:07:22 +00:00
m68k m68k: Clean up includes 2016-01-29 15:07:24 +00:00
mem hw: Clean up includes 2016-01-29 15:07:25 +00:00
microblaze microblaze: Clean up includes 2016-01-28 11:13:13 +00:00
mips mips: Clean up includes 2016-01-23 14:30:04 +00:00
misc ivshmem: use a single eventfd callback, get rid of CharDriver 2016-02-02 13:28:58 +01:00
moxie moxie: Clean up includes 2016-01-29 15:07:25 +00:00
net virtio: move allocation to virtqueue_pop/vring_pop 2016-02-06 20:39:07 +02:00
nvram hw: Clean up includes 2016-01-29 15:07:25 +00:00
openrisc openrisc: Clean up includes 2016-01-29 15:07:24 +00:00
pci pci: Clean up includes 2016-01-29 15:07:24 +00:00
pci-bridge pci: Clean up includes 2016-01-29 15:07:24 +00:00
pci-host uninorth.c: add support for UniNorth kMacRISCPCIAddressSelect (0x48) register 2016-01-30 23:37:38 +11:00
pcmcia hw: Clean up includes 2016-01-29 15:07:25 +00:00
ppc target-ppc: Helper to determine page size information from hpte alone 2016-01-30 23:49:27 +11:00
s390x s390: Clean up includes 2016-01-29 15:07:22 +00:00
scsi virtio: introduce qemu_get/put_virtqueue_element 2016-02-06 20:44:08 +02:00
sd hw: Clean up includes 2016-01-29 15:07:25 +00:00
sh4 sh4: Clean up includes 2016-01-29 15:07:24 +00:00
smbios hw: Clean up includes 2016-01-29 15:07:25 +00:00
sparc sparc: Clean up includes 2016-01-29 15:07:22 +00:00
sparc64 sparc: Clean up includes 2016-01-29 15:07:22 +00:00
ssi hw: Clean up includes 2016-01-29 15:07:25 +00:00
timer log: do not unnecessarily include qom/cpu.h 2016-02-03 09:19:10 +00:00
tpm hw: Clean up includes 2016-01-29 15:07:25 +00:00
tricore tricore: Clean up includes 2016-01-29 15:07:25 +00:00
unicore32 unicore: Clean up includes 2016-01-29 15:07:22 +00:00
usb ehci: update irq on reset 2016-02-02 14:11:01 +01:00
vfio hw/vfio: Clean up includes 2016-01-29 15:07:24 +00:00
virtio virtio: read avail_idx from VQ only when necessary 2016-02-06 20:44:08 +02:00
watchdog hw: Clean up includes 2016-01-29 15:07:25 +00:00
xen xen: Clean up includes 2016-01-29 15:07:23 +00:00
xenpv xen: Clean up includes 2016-01-29 15:07:23 +00:00
xtensa xtensa: Clean up includes 2016-01-29 15:07:24 +00:00
Makefile.objs Add a base IPMI interface 2015-12-22 18:39:19 +02:00