[PATCHv2 06/13] qemu: add flag to disable MSI-X by default
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2009-06-02 15:02:37
Subsystem:
the rest · Maintainer:
Linus Torvalds
Add global flag to disable MSI-X by default. This is useful primarily to make images loadable by older qemu (without msix). Even when MSI-X is disabled by flag, you can still load images that have MSI-X enabled. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- hw/msix.c | 3 +++ qemu-options.hx | 2 ++ vl.c | 3 +++ 3 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/hw/msix.c b/hw/msix.c
index 4db2fc1..970a8ca 100644
--- a/hw/msix.c
+++ b/hw/msix.c@@ -122,6 +122,9 @@ void msix_write_config(PCIDevice *dev, uint32_t addr, uint32_t val, int len) { unsigned enable_pos = dev->msix_cap + MSIX_ENABLE_OFFSET; + if (!(dev->cap_present & QEMU_PCI_CAP_MSIX)) + return; + if (addr + len <= enable_pos || addr > enable_pos) return;
diff --git a/qemu-options.hx b/qemu-options.hx
index 87af798..fd041a4 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx@@ -1575,3 +1575,5 @@ DEF("semihosting", 0, QEMU_OPTION_semihosting, DEF("old-param", 0, QEMU_OPTION_old_param, "-old-param old param mode\n") #endif +DEF("disable-msix", 0, QEMU_OPTION_disable_msix, + "-disable-msix disable msix support for PCI devices (enabled by default)\n")
diff --git a/vl.c b/vl.c
index 2c1f0e0..2757d4f 100644
--- a/vl.c
+++ b/vl.c@@ -134,6 +134,7 @@ int main(int argc, char **argv) #include "hw/usb.h" #include "hw/pcmcia.h" #include "hw/pc.h" +#include "hw/msix.h" #include "hw/audiodev.h" #include "hw/isa.h" #include "hw/baum.h"
@@ -5557,6 +5558,8 @@ int main(int argc, char **argv, char **envp) xen_mode = XEN_ATTACH; break; #endif + case QEMU_OPTION_disable_msix: + msix_disable = 1; } } }
--
1.6.3.1.56.g79e1.dirty