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From: Sheng Yang <sheng@linux.intel.com>
To: Avi Kivity <avi@redhat.com>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	Anthony Liguori <anthony@codemonkey.ws>
Cc: kvm@vger.kernel.org, Sheng Yang <sheng@linux.intel.com>,
	Allen Kay <allen.m.kay@intel.com>
Subject: [PATCH 03/10] Figure out device capability
Date: Mon,  2 Mar 2009 16:29:26 +0800	[thread overview]
Message-ID: <1235982573-6932-4-git-send-email-sheng@linux.intel.com> (raw)
In-Reply-To: <1235982573-6932-1-git-send-email-sheng@linux.intel.com>

Try to figure out device capability in update_dev_cap(). Now we are only care
about MSI capability.

The function pci_find_cap_offset original function wrote by Allen for Xen.
Notice the function need root privilege to work. This depends on libpci to work.

Signed-off-by: Allen Kay <allen.m.kay@intel.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
---
 qemu/hw/device-assignment.c |   29 +++++++++++++++++++++++++++++
 qemu/hw/device-assignment.h |    1 +
 2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/qemu/hw/device-assignment.c b/qemu/hw/device-assignment.c
index c9a3b8e..fc05ac7 100644
--- a/qemu/hw/device-assignment.c
+++ b/qemu/hw/device-assignment.c
@@ -219,6 +219,35 @@ static void assigned_dev_ioport_map(PCIDevice *pci_dev, int region_num,
                           (r_dev->v_addrs + region_num));
 }
 
+static uint8_t pci_find_cap_offset(struct pci_dev *pci_dev, uint8_t cap)
+{
+    int id;
+    int max_cap = 48;
+    int pos = PCI_CAPABILITY_LIST;
+    int status;
+
+    status = pci_read_byte(pci_dev, PCI_STATUS);
+    if ((status & PCI_STATUS_CAP_LIST) == 0)
+        return 0;
+
+    while (max_cap--) {
+        pos = pci_read_byte(pci_dev, pos);
+        if (pos < 0x40)
+            break;
+
+        pos &= ~3;
+        id = pci_read_byte(pci_dev, pos + PCI_CAP_LIST_ID);
+
+        if (id == 0xff)
+            break;
+        if (id == cap)
+            return pos;
+
+        pos += PCI_CAP_LIST_NEXT;
+    }
+    return 0;
+}
+
 static void assigned_dev_pci_write_config(PCIDevice *d, uint32_t address,
                                           uint32_t val, int len)
 {
diff --git a/qemu/hw/device-assignment.h b/qemu/hw/device-assignment.h
index da775d7..0fd78de 100644
--- a/qemu/hw/device-assignment.h
+++ b/qemu/hw/device-assignment.h
@@ -29,6 +29,7 @@
 #define __DEVICE_ASSIGNMENT_H__
 
 #include <sys/mman.h>
+#include <pci/pci.h>
 #include "qemu-common.h"
 #include "sys-queue.h"
 #include "pci.h"
-- 
1.5.4.5


  parent reply	other threads:[~2009-03-02  8:29 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-02  8:29 [PATCH 0/10 v4] MSI/MSI-X capability in userspace Sheng Yang
2009-03-02  8:29 ` [PATCH 01/10] kvm: Replace force type convert with container_of() Sheng Yang
2009-03-02  8:29 ` [PATCH 02/10] Make device assignment depend on libpci Sheng Yang
2009-03-02  8:29 ` Sheng Yang [this message]
2009-03-03 12:50   ` [PATCH 03/10] Figure out device capability Marcelo Tosatti
2009-03-04  3:04     ` Sheng Yang
2009-03-02  8:29 ` [PATCH 04/10] Support for " Sheng Yang
2009-03-03 12:42   ` Marcelo Tosatti
2009-03-04  2:56     ` Sheng Yang
2009-03-04 13:57       ` Marcelo Tosatti
2009-03-02  8:29 ` [PATCH 05/10] kvm: user interface for MSI type irq routing Sheng Yang
2009-03-02  8:29 ` [PATCH 06/10] kvm: libkvm: allocate unused gsi for " Sheng Yang
2009-03-02  8:29 ` [PATCH 07/10] kvm: expose MSI capability to guest Sheng Yang
2009-03-02  8:29 ` [PATCH 08/10] Add MSI-X related macro to pci.c Sheng Yang
2009-03-02  8:29 ` [PATCH 09/10] kvm: add ioctl KVM_SET_MSIX_ENTRY_NR and KVM_SET_MSIX_ENTRY Sheng Yang
2009-03-02  8:29 ` [PATCH 10/10] kvm: enable MSI-X capabilty for assigned device Sheng Yang

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