On 08/24/2011 05:25 PM, David Evensky wrote:
This patch adds a PCI device that provides PCI device memory to the
guest. This memory in the guest exists as a shared memory segment in
the host. This is similar memory sharing capability of Nahanni
(ivshmem) available in QEMU. In this case, the shared memory segment
is exposed as a PCI BAR only.
A new command line argument is added as:
--shmem pci:0xc8000000:16MB:handle=/newmem:create
diff -uprN -X linux-kvm/Documentation/dontdiff linux-kvm/tools/kvm/include/kvm/pci-shmem.h linux-kvm_pci_shmem/tools/kvm/include/kvm/pci-shmem.h
--- linux-kvm/tools/kvm/include/kvm/pci-shmem.h 1969-12-31 16:00:00.000000000 -0800
+++ linux-kvm_pci_shmem/tools/kvm/include/kvm/pci-shmem.h 2011-08-13 15:43:01.067953711 -0700
@@ -0,0 +1,13 @@
+#ifndef KVM__PCI_SHMEM_H
+#define KVM__PCI_SHMEM_H
+
+#include<linux/types.h>
+#include<linux/list.h>
+
+struct kvm;
+struct shmem_info;
+
+int pci_shmem__init(struct kvm *self);
+int pci_shmem__register_mem(struct shmem_info *si);
+
+#endif
diff -uprN -X linux-kvm/Documentation/dontdiff linux-kvm/tools/kvm/include/kvm/virtio-pci-dev.h linux-kvm_pci_shmem/tools/kvm/include/kvm/virtio-pci-dev.h
--- linux-kvm/tools/kvm/include/kvm/virtio-pci-dev.h 2011-08-09 15:38:48.760120973 -0700
+++ linux-kvm_pci_shmem/tools/kvm/include/kvm/virtio-pci-dev.h 2011-08-18 10:06:12.171539230 -0700
@@ -15,10 +15,13 @@
#define PCI_DEVICE_ID_VIRTIO_BLN 0x1005
#define PCI_DEVICE_ID_VIRTIO_P9 0x1009
#define PCI_DEVICE_ID_VESA 0x2000
+#define PCI_DEVICE_ID_PCI_SHMEM 0x0001
#define PCI_VENDOR_ID_REDHAT_QUMRANET 0x1af4
+#define PCI_VENDOR_ID_PCI_SHMEM 0x0001
#define PCI_SUBSYSTEM_VENDOR_ID_REDHAT_QUMRANET 0x1af4
FYI, that's not a valid vendor and device ID.
Perhaps the RH folks would be willing to reserve a portion of the device
ID space in their vendor ID for ya'll to play around with.
Regards,
Anthony Liguori
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