11:11 a.m.
Virt machine in qemu since v2.3.0 has PCI generic host controller, and can use
PCI devices. This provides performance improvement as well as vhost-net with
irqfd support for virtio-net. However libvirt currently does not allow ARM virt
machine to have PCI devices. This patchset adds the necessary support.
Changes since v3:
- Capability is based not on qemu version but on support of "gpex-pcihost"
device by qemu
- Added a workaround, allowing to pass "make check". The problem is that
test suite does not build capabilities cache. Unfortunately this means
that correct unit-test for the new functionality currently cannot be
written. Test suite framework needs to be improved.
Changes since v2:
Complete rework, use different approach
- Correctly model PCI Express bus on the machine. It is now possible to
explicitly specify <address-type='pci'> with attributes. This allows to
attach not only virtio, but any other PCI device to the model.
- Default is not changed and still mmio, for backwards compatibility with
existing installations. PCI bus has to be explicitly specified.
- Check for the capability in correct place, in v2 it actually did not work
Changes since v1:
- Added capability based on qemu version number
- Recognize also "virt-" prefix
Pavel Fedin (3):
Introduce QEMU_CAPS_OBJECT_GPEX
Add PCI-Express root to ARM virt machine
Build correct command line for PCI NICs on ARM
src/qemu/qemu_capabilities.c | 2 ++
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_command.c | 3 ++-
src/qemu/qemu_domain.c | 17 +++++++++++++----
4 files changed, 18 insertions(+), 5 deletions(-)
--
1.9.5.msysgit.0
11:11 a.m.
New subject: [libvirt] [PATCH v4 1/3] Introduce QEMU_CAPS_OBJECT_GPEX
This capability specifies that qemu can implement generic PCI host
controller. It is often used for virtual environments, including ARM.
Signed-off-by: Pavel Fedin <p.fedin(a)samsung.com>
---
src/qemu/qemu_capabilities.c | 2 ++
src/qemu/qemu_capabilities.h | 1 +
2 files changed, 3 insertions(+)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 27686c3..0f37396 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -287,6 +287,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
"aarch64-off",
"vhost-user-multiqueue", /* 190 */
+ "gpex-pcihost",
);
@@ -1566,6 +1567,7 @@ struct virQEMUCapsStringFlags virQEMUCapsObjectTypes[] = {
{ "ivshmem", QEMU_CAPS_DEVICE_IVSHMEM },
{ "pc-dimm", QEMU_CAPS_DEVICE_PC_DIMM },
{ "pci-serial", QEMU_CAPS_DEVICE_PCI_SERIAL },
+ { "gpex-pcihost", QEMU_CAPS_OBJECT_GPEX},
};
static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioBlk[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 30aa504..7888811 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -230,6 +230,7 @@ typedef enum {
QEMU_CAPS_DEVICE_PCI_SERIAL = 188, /* -device pci-serial */
QEMU_CAPS_CPU_AARCH64_OFF = 189, /* -cpu ...,aarch64=off */
QEMU_CAPS_VHOSTUSER_MULTIQUEUE = 190, /* vhost-user with -netdev queues= */
+ QEMU_CAPS_OBJECT_GPEX = 191, /* have generic PCI host controller */
QEMU_CAPS_LAST, /* this must always be the last item */
} virQEMUCapsFlags;
--
1.9.5.msysgit.0
11:11 a.m.
New subject: [libvirt] [PATCH v4 2/3] Add PCI-Express root to ARM virt machine
Here we assume that if qemu supports generic PCI host controller,
it is a part of virt machine and can be used for adding PCI devices.
Signed-off-by: Pavel Fedin <p.fedin(a)samsung.com>
---
src/qemu/qemu_domain.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 8b050a0..c7d14e4 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -981,7 +981,7 @@ virDomainXMLNamespace virQEMUDriverDomainXMLNamespace = {
static int
qemuDomainDefPostParse(virDomainDefPtr def,
virCapsPtr caps,
- void *opaque ATTRIBUTE_UNUSED)
+ void *opaque)
{
bool addDefaultUSB = true;
bool addImplicitSATA = false;
@@ -1030,12 +1030,21 @@ qemuDomainDefPostParse(virDomainDefPtr def,
break;
case VIR_ARCH_ARMV7L:
- addDefaultUSB = false;
- addDefaultMemballoon = false;
- break;
case VIR_ARCH_AARCH64:
addDefaultUSB = false;
addDefaultMemballoon = false;
+ if (STREQ(def->os.machine, "virt") ||
+ STRPREFIX(def->os.machine, "virt-")) {
+ virQEMUDriverPtr driver = opaque;
+
+ /* This condition is actually a (temporary) hack for test suite which
+ * does not create capabilities cache */
+ if (driver->qemuCapsCache) {
+ virQEMUCapsPtr qemuCaps =
+ virQEMUCapsCacheLookup(driver->qemuCapsCache, def->emulator);
+ addPCIeRoot = virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_GPEX);
+ }
+ }
break;
case VIR_ARCH_PPC64:
--
1.9.5.msysgit.0
11:11 a.m.
New subject: [libvirt] [PATCH v4 3/3] Build correct command line for PCI NICs on ARM
Legacy -net option works correctly only with embedded device models, which
do not require any bus specification. Therefore, we should use -device for
PCI hardware
Signed-off-by: Pavel Fedin <p.fedin(a)samsung.com>
---
src/qemu/qemu_command.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index b7b85ab..9d6be9f 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -457,7 +457,8 @@ qemuDomainSupportsNicdev(virDomainDefPtr def,
/* non-virtio ARM nics require legacy -net nic */
if (((def->os.arch == VIR_ARCH_ARMV7L) ||
(def->os.arch == VIR_ARCH_AARCH64)) &&
- net->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_VIRTIO_MMIO)
+ net->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_VIRTIO_MMIO &&
+ net->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI)
return false;
return true;
--
1.9.5.msysgit.0
3359
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Pavel Fedin