[libvirt] [PATCH 15/41] qemu: Introduce virQEMUCapsGuestIsNative
To have a single place where we decide whether a guest can run natively
on a host.
Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com>
---
src/qemu/qemu_capabilities.c | 43 +++++++++++++++++++++++++++----------------
1 file changed, 27 insertions(+), 16 deletions(-)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 58a96d4..aeea3a3 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -428,6 +428,29 @@ static const char *virQEMUCapsArchToString(virArch arch)
return virArchToString(arch);
}
+
+/* Checks whether a domain with @guest arch can run natively on @host.
+ */
+static bool
+virQEMUCapsGuestIsNative(virArch host,
+ virArch guest)
+{
+ if (host == guest)
+ return true;
+
+ if (host == VIR_ARCH_X86_64 && guest == VIR_ARCH_I686)
+ return true;
+
+ if (host == VIR_ARCH_AARCH64 && guest == VIR_ARCH_ARMV7L)
+ return true;
+
+ if (ARCH_IS_PPC64(host) && ARCH_IS_PPC64(guest))
+ return true;
+
+ return false;
+}
+
+
/* Given a host and guest architectures, find a suitable QEMU target.
*
* This is meant to be used as a second attempt if qemu-system-$guestarch
@@ -441,12 +464,8 @@ virQEMUCapsFindTarget(virArch hostarch,
if (ARCH_IS_PPC64(guestarch))
guestarch = VIR_ARCH_PPC64;
- /* armv7l guests on aarch64 hosts can use the aarch64 target
- * i686 guests on x86_64 hosts can use the x86_64 target */
- if ((guestarch == VIR_ARCH_ARMV7L && hostarch == VIR_ARCH_AARCH64) ||
- (guestarch == VIR_ARCH_I686 && hostarch == VIR_ARCH_X86_64)) {
- return hostarch;
- }
+ if (virQEMUCapsGuestIsNative(hostarch, guestarch))
+ guestarch = hostarch;
return guestarch;
}
@@ -807,7 +826,6 @@ virQEMUCapsInitGuest(virCapsPtr caps,
char *binary = NULL;
virQEMUCapsPtr qemubinCaps = NULL;
virQEMUCapsPtr kvmbinCaps = NULL;
- bool native_kvm, x86_32on64_kvm, arm_32on64_kvm, ppc64_kvm;
int ret = -1;
/* Check for existence of base emulator, or alternate base
@@ -829,14 +847,7 @@ virQEMUCapsInitGuest(virCapsPtr caps,
* - hostarch is aarch64 and guest arch is armv7l (needs -cpu aarch64=off)
* - hostarch and guestarch are both ppc64*
*/
- native_kvm = (hostarch == guestarch);
- x86_32on64_kvm = (hostarch == VIR_ARCH_X86_64 &&
- guestarch == VIR_ARCH_I686);
- arm_32on64_kvm = (hostarch == VIR_ARCH_AARCH64 &&
- guestarch == VIR_ARCH_ARMV7L);
- ppc64_kvm = (ARCH_IS_PPC64(hostarch) && ARCH_IS_PPC64(guestarch));
-
- if (native_kvm || x86_32on64_kvm || arm_32on64_kvm || ppc64_kvm) {
+ if (virQEMUCapsGuestIsNative(hostarch, guestarch)) {
const char *kvmbins[] = {
"/usr/libexec/qemu-kvm", /* RHEL */
"qemu-kvm", /* Fedora */
@@ -852,7 +863,7 @@ virQEMUCapsInitGuest(virCapsPtr caps,
* arm is different in that 32-on-64 _only_ works with
* qemu-system-aarch64. So we have to add it to the kvmbins list
*/
- if (arm_32on64_kvm)
+ if (hostarch == VIR_ARCH_AARCH64 && guestarch == VIR_ARCH_ARMV7L)
kvmbins[3] = "qemu-system-aarch64";
for (i = 0; i < ARRAY_CARDINALITY(kvmbins); ++i) {
--
2.9.2