From e3816255bf4b6377bb405331e2ee0dc14d841b80 Mon Sep 17 00:00:00 2001 From: "Denis V. Lunev" Date: Mon, 15 Jun 2015 13:52:52 +0300 Subject: balloon: add a feature bit to let Guest OS deflate balloon on oom Excessive virtio_balloon inflation can cause invocation of OOM-killer, when Linux is under severe memory pressure. Various mechanisms are responsible for correct virtio_balloon memory management. Nevertheless it is often the case that these control tools does not have enough time to react on fast changing memory load. As a result OS runs out of memory and invokes OOM-killer. The balancing of memory by use of the virtio balloon should not cause the termination of processes while there are pages in the balloon. Now there is no way for virtio balloon driver to free memory at the last moment before some process get killed by OOM-killer. This does not provide a security breach as balloon itself is running inside Guest OS and is working in the cooperation with the host. Thus some improvements from Guest side should be considered as normal. To solve the problem, introduce a virtio_balloon callback which is expected to be called from the oom notifier call chain in out_of_memory() function. If virtio balloon could release some memory, it will make the system return and retry the allocation that forced the out of memory killer to run. This behavior should be enabled if and only if appropriate feature bit is set on the device. It is off by default. This functionality was recently merged into vanilla Linux. commit 5a10b7dbf904bfe01bb9fcc6298f7df09eed77d5 Author: Raushaniya Maksudova Date: Mon Nov 10 09:36:29 2014 +1030 This patch adds respective control bits into QEMU. It introduces deflate-on-oom option for balloon device which does the trick. Signed-off-by: Denis V. Lunev CC: Raushaniya Maksudova CC: Anthony Liguori CC: Michael S. Tsirkin Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Acked-by: James Bottomley Reviewed-by: Christian Borntraeger --- include/hw/virtio/virtio-balloon.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/hw') diff --git a/include/hw/virtio/virtio-balloon.h b/include/hw/virtio/virtio-balloon.h index 346a9fdb7d..09c2ce4dcd 100644 --- a/include/hw/virtio/virtio-balloon.h +++ b/include/hw/virtio/virtio-balloon.h @@ -42,6 +42,7 @@ typedef struct VirtIOBalloon { QEMUTimer *stats_timer; int64_t stats_last_update; int64_t stats_poll_interval; + uint32_t host_features; } VirtIOBalloon; #endif -- cgit v1.2.3 From eb6c6a604890201e321a6ace32973d10dc033245 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Thu, 18 Jun 2015 12:17:29 +0200 Subject: add pci-bridge-seat Simplifies multiseat configuration, see docs/multiseat.txt update for details. Signed-off-by: Gerd Hoffmann Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/hw/pci/pci.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/hw') diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index d44bc84d1e..551cb3d608 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -92,6 +92,7 @@ #define PCI_DEVICE_ID_REDHAT_SDHCI 0x0007 #define PCI_DEVICE_ID_REDHAT_PCIE_HOST 0x0008 #define PCI_DEVICE_ID_REDHAT_PXB 0x0009 +#define PCI_DEVICE_ID_REDHAT_BRIDGE_SEAT 0x000a #define PCI_DEVICE_ID_REDHAT_QXL 0x0100 #define FMT_PCIBUS PRIx64 -- cgit v1.2.3 From 0034e56209c1333bfca53356ce82663d801a15c5 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Fri, 19 Jun 2015 04:40:09 +0200 Subject: hw/pci-bridge: expose _test parameter in SHPC_VMSTATE() Change the signature of the function-like macro SHPC_VMSTATE(), so that we can produce and expect this field conditionally in the migration stream, starting with an upcoming patch. Cc: Michael S. Tsirkin Cc: Marcel Apfelbaum Signed-off-by: Laszlo Ersek Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/hw/pci/shpc.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'include/hw') diff --git a/include/hw/pci/shpc.h b/include/hw/pci/shpc.h index 9bbea39996..14015afd06 100644 --- a/include/hw/pci/shpc.h +++ b/include/hw/pci/shpc.h @@ -51,7 +51,8 @@ void shpc_device_hot_unplug_request_cb(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp); extern VMStateInfo shpc_vmstate_info; -#define SHPC_VMSTATE(_field, _type) \ - VMSTATE_BUFFER_UNSAFE_INFO(_field, _type, 0, shpc_vmstate_info, 0) +#define SHPC_VMSTATE(_field, _type, _test) \ + VMSTATE_BUFFER_UNSAFE_INFO_TEST(_field, _type, _test, 0, \ + shpc_vmstate_info, 0) #endif -- cgit v1.2.3 From 3cf0ecb3c4f9bb6a7a58a62c0209509b4c9d13c6 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Fri, 19 Jun 2015 04:40:10 +0200 Subject: hw/pci-bridge: add macro for "chassis_nr" property This should help catch property name typos at compile time. Cc: Michael S. Tsirkin Cc: Marcel Apfelbaum Signed-off-by: Laszlo Ersek Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/hw/pci/pci_bridge.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/hw') diff --git a/include/hw/pci/pci_bridge.h b/include/hw/pci/pci_bridge.h index 1d8f9973c7..f3ac49f1c8 100644 --- a/include/hw/pci/pci_bridge.h +++ b/include/hw/pci/pci_bridge.h @@ -28,6 +28,8 @@ #include "hw/pci/pci.h" +#define PCI_BRIDGE_DEV_PROP_CHASSIS_NR "chassis_nr" + int pci_bridge_ssvid_init(PCIDevice *dev, uint8_t offset, uint16_t svid, uint16_t ssid); -- cgit v1.2.3 From 7a7c6a41c5583b24f6a35b02c7f68c84ebd7e177 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Fri, 19 Jun 2015 04:40:11 +0200 Subject: hw/pci-bridge: add macro for "msi" property This should help catch property name typos at compile time. Cc: Michael S. Tsirkin Cc: Marcel Apfelbaum Signed-off-by: Laszlo Ersek Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/hw/pci/pci_bridge.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/hw') diff --git a/include/hw/pci/pci_bridge.h b/include/hw/pci/pci_bridge.h index f3ac49f1c8..a438eda56b 100644 --- a/include/hw/pci/pci_bridge.h +++ b/include/hw/pci/pci_bridge.h @@ -29,6 +29,7 @@ #include "hw/pci/pci.h" #define PCI_BRIDGE_DEV_PROP_CHASSIS_NR "chassis_nr" +#define PCI_BRIDGE_DEV_PROP_MSI "msi" int pci_bridge_ssvid_init(PCIDevice *dev, uint8_t offset, uint16_t svid, uint16_t ssid); -- cgit v1.2.3 From 23ab143dcce8d7f758eb6946ebf68d8689018a9c Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Fri, 19 Jun 2015 04:40:12 +0200 Subject: hw/pci: introduce shpc_present() helper function It follows msi_present() in "include/hw/pci/msi.h". Cc: Michael S. Tsirkin Cc: Marcel Apfelbaum Signed-off-by: Laszlo Ersek Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/hw/pci/shpc.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/hw') diff --git a/include/hw/pci/shpc.h b/include/hw/pci/shpc.h index 14015afd06..2c871b947b 100644 --- a/include/hw/pci/shpc.h +++ b/include/hw/pci/shpc.h @@ -6,6 +6,7 @@ #include "migration/vmstate.h" #include "qapi/error.h" #include "hw/hotplug.h" +#include "hw/pci/pci.h" struct SHPCDevice { /* Capability offset in device's config space */ @@ -55,4 +56,9 @@ extern VMStateInfo shpc_vmstate_info; VMSTATE_BUFFER_UNSAFE_INFO_TEST(_field, _type, _test, 0, \ shpc_vmstate_info, 0) +static inline bool shpc_present(const PCIDevice *dev) +{ + return dev->cap_present & QEMU_PCI_CAP_SHPC; +} + #endif -- cgit v1.2.3 From 4e5c9bfecf5da13e8e0f790002a55bb1cc0437b1 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Fri, 19 Jun 2015 04:40:13 +0200 Subject: hw/pci-bridge: introduce "shpc" property In the PCI expander bridge, we will want to disable those features of pci-bridge that relate to SHPC (standard hotplug controller): - SHPC bar and underlying MemoryRegion - interrupt (INTx or MSI) - effective hotplug callbacks - other SHPC hooks (initialization, cleanup, migration etc) Introduce a new feature request bit in the PCIBridgeDev.flags field, and turn off the above if the bit is explicitly cleared. Suggested-by: Michael S. Tsirkin Cc: Michael S. Tsirkin Cc: Marcel Apfelbaum Signed-off-by: Laszlo Ersek Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/hw/pci/pci_bridge.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/hw') diff --git a/include/hw/pci/pci_bridge.h b/include/hw/pci/pci_bridge.h index a438eda56b..93b621cef3 100644 --- a/include/hw/pci/pci_bridge.h +++ b/include/hw/pci/pci_bridge.h @@ -30,6 +30,7 @@ #define PCI_BRIDGE_DEV_PROP_CHASSIS_NR "chassis_nr" #define PCI_BRIDGE_DEV_PROP_MSI "msi" +#define PCI_BRIDGE_DEV_PROP_SHPC "shpc" int pci_bridge_ssvid_init(PCIDevice *dev, uint8_t offset, uint16_t svid, uint16_t ssid); -- cgit v1.2.3 From 0b336b3b98d8983d821ef9b0f159acc7c77cbac7 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Fri, 19 Jun 2015 04:40:16 +0200 Subject: hw/core: explicit OFW unit address callback for SysBusDeviceClass The sysbus_get_fw_dev_path() function formats OpenFirmware device path nodes ("driver-name@unit-address") for sysbus devices. The first choice for "unit-address" is the base address of the device's first MMIO region. The second choice is its first IO port. However, if two sysbus devices with the same "driver-name" lack both MMIO and PIO resources, then there is no good way to distinguish them based on their OFW nodes, because in this case unit-address is omitted completely for both devices. An example is TYPE_PXB_HOST ("pxb-host"). For the sake of such devices, introduce the explicit_ofw_unit_address() "virtual member function". With this function, each sysbus device in the same SysBusDeviceClass can state its own address. Cc: Markus Armbruster Cc: Marcel Apfelbaum Cc: Michael S. Tsirkin Signed-off-by: Laszlo Ersek Reviewed-by: Marcel Apfelbaum Tested-by: Marcel Apfelbaum Reviewed-by: Markus Armbruster Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/hw/sysbus.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'include/hw') diff --git a/include/hw/sysbus.h b/include/hw/sysbus.h index d1f3f000f9..34f93c39bf 100644 --- a/include/hw/sysbus.h +++ b/include/hw/sysbus.h @@ -41,6 +41,23 @@ typedef struct SysBusDeviceClass { /*< public >*/ int (*init)(SysBusDevice *dev); + + /* + * Let the sysbus device format its own non-PIO, non-MMIO unit address. + * + * Sometimes a class of SysBusDevices has neither MMIO nor PIO resources, + * yet instances of it would like to distinguish themselves, in + * OpenFirmware device paths, from other instances of the same class on the + * sysbus. For that end we expose this callback. + * + * The implementation is not supposed to change *@dev, or incur other + * observable change. + * + * The function returns a dynamically allocated string. On error, NULL + * should be returned; the unit address portion of the OFW node will be + * omitted then. (This is not considered a fatal error.) + */ + char *(*explicit_ofw_unit_address)(const SysBusDevice *dev); } SysBusDeviceClass; struct SysBusDevice { -- cgit v1.2.3