Hi,
I want to manage a 32 bit i686 guest on an x86_64 host with kvm and libvirt.
KVM is perfectly capable of doing this (look e.g. at
http://kvm.qumranet.com/kvmwiki/Guest_Support_Status) but libvirt did not
allow it.
So I created the attached patch to allow it and make it easy to extend the
capabilities of kvm and kqemu later on.
I did not add anything I'm not sure about, so I did not at 64bit guest on
32bit host (though the page linked above seems to indicate that it works) and
did not change the capabilities of kqemu at all (because I don't have any
experience with it and never used it).
Please consider merging.
Kind regards,
Gerd
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diff -r -u libvirt-0.4.2.orig/src/qemu_conf.c libvirt-0.4.2/src/qemu_conf.c
--- libvirt-0.4.2.orig/src/qemu_conf.c 2008-05-29 21:25:01.000000000 +0200
+++ libvirt-0.4.2/src/qemu_conf.c 2008-06-03 01:01:19.000000000 +0200
@@ -293,6 +293,11 @@
int nflags;
};
+struct hypervisor_capabilities {
+ const char *hostarch;
+ const char *guestarch;
+};
+
/* Feature flags for the architecture info */
static const struct qemu_feature_flags const arch_info_i686_flags [] = {
{ "pae", 1, 0 },
@@ -329,6 +334,17 @@
"/usr/bin/xenner", arch_info_x86_64_flags, 2 },
};
+static const struct hypervisor_capabilities const kvm_capa[] = {
+ { "i686", "i686" },
+ { "x86_64", "i686" },
+ { "x86_64", "x86_64" },
+};
+
+static const struct hypervisor_capabilities const kqemu_capa[] = {
+ { "i686", "i686" },
+ { "x86_64", "x86_64" },
+};
+
static int
qemudCapsInitGuest(virCapsPtr caps,
const char *hostmachine,
@@ -358,25 +374,33 @@
NULL) == NULL)
return -1;
- /* If guest & host match, then we can accelerate */
- if (STREQ(info->arch, hostmachine)) {
- if (access("/dev/kqemu", F_OK) == 0 &&
- virCapabilitiesAddGuestDomain(guest,
- "kqemu",
- NULL,
- NULL,
- 0,
- NULL) == NULL)
- return -1;
+ /* If guest / host combo is listed as supported, we can accelerate */
+ for (i = 0; i < sizeof(kqemu_capa)/sizeof(kqemu_capa[0]); i++) {
+ if (STREQ(hostmachine, kqemu_capa[i].hostarch) &&
+ STREQ(info->arch, kqemu_capa[i].guestarch)) {
+ if (access("/dev/kqemu", F_OK) == 0 &&
+ virCapabilitiesAddGuestDomain(guest,
+ "kqemu",
+ NULL,
+ NULL,
+ 0,
+ NULL) == NULL)
+ return -1;
+ }
+ }
- if (access("/dev/kvm", F_OK) == 0 &&
- virCapabilitiesAddGuestDomain(guest,
- "kvm",
- "/usr/bin/qemu-kvm",
- NULL,
- 0,
- NULL) == NULL)
- return -1;
+ for (i = 0; i < sizeof(kvm_capa)/sizeof(kvm_capa[0]); i++) {
+ if (STREQ(hostmachine, kvm_capa[i].hostarch) &&
+ STREQ(info->arch, kvm_capa[i].guestarch)) {
+ if (access("/dev/kvm", F_OK) == 0 &&
+ virCapabilitiesAddGuestDomain(guest,
+ "kvm",
+ "/usr/bin/qemu-kvm",
+ NULL,
+ 0,
+ NULL) == NULL)
+ return -1;
+ }
}
} else {
if (virCapabilitiesAddGuestDomain(guest,
Only in libvirt-0.4.2/src: qemu_conf.c~
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