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qemu: Introduce virQEMUCapsGuestIsNative

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To have a single place where we decide whether a guest can run natively
on a host.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
Jiri Denemark 2016-06-14 17:25:58 +02:00
parent 0b7cf7f744
commit f2e71550d6
1 changed files with 27 additions and 16 deletions
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43
src/qemu/qemu_capabilities.c
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@ -433,6 +433,29 @@ static const char *virQEMUCapsArchToString(virArch arch)
return virArchToString(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. /* Given a host and guest architectures, find a suitable QEMU target.
* *
* This is meant to be used as a second attempt if qemu-system-$guestarch * This is meant to be used as a second attempt if qemu-system-$guestarch
@ -446,12 +469,8 @@ virQEMUCapsFindTarget(virArch hostarch,
if (ARCH_IS_PPC64(guestarch)) if (ARCH_IS_PPC64(guestarch))
guestarch = VIR_ARCH_PPC64; guestarch = VIR_ARCH_PPC64;
/* armv7l guests on aarch64 hosts can use the aarch64 target if (virQEMUCapsGuestIsNative(hostarch, guestarch))
* i686 guests on x86_64 hosts can use the x86_64 target */ guestarch = hostarch;
if ((guestarch == VIR_ARCH_ARMV7L && hostarch == VIR_ARCH_AARCH64) ||
(guestarch == VIR_ARCH_I686 && hostarch == VIR_ARCH_X86_64)) {
return hostarch;
}
return guestarch; return guestarch;
} }
@ -813,7 +832,6 @@ virQEMUCapsInitGuest(virCapsPtr caps,
char *binary = NULL; char *binary = NULL;
virQEMUCapsPtr qemubinCaps = NULL; virQEMUCapsPtr qemubinCaps = NULL;
virQEMUCapsPtr kvmbinCaps = NULL; virQEMUCapsPtr kvmbinCaps = NULL;
bool native_kvm, x86_32on64_kvm, arm_32on64_kvm, ppc64_kvm;
int ret = -1; int ret = -1;
/* Check for existence of base emulator, or alternate base /* Check for existence of base emulator, or alternate base
@ -835,14 +853,7 @@ virQEMUCapsInitGuest(virCapsPtr caps,
* - hostarch is aarch64 and guest arch is armv7l (needs -cpu aarch64=off) * - hostarch is aarch64 and guest arch is armv7l (needs -cpu aarch64=off)
* - hostarch and guestarch are both ppc64* * - hostarch and guestarch are both ppc64*
*/ */
native_kvm = (hostarch == guestarch); if (virQEMUCapsGuestIsNative(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) {
const char *kvmbins[] = { const char *kvmbins[] = {
"/usr/libexec/qemu-kvm", /* RHEL */ "/usr/libexec/qemu-kvm", /* RHEL */
"qemu-kvm", /* Fedora */ "qemu-kvm", /* Fedora */
@ -858,7 +869,7 @@ virQEMUCapsInitGuest(virCapsPtr caps,
* arm is different in that 32-on-64 _only_ works with * arm is different in that 32-on-64 _only_ works with
* qemu-system-aarch64. So we have to add it to the kvmbins list * 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"; kvmbins[3] = "qemu-system-aarch64";
for (i = 0; i < ARRAY_CARDINALITY(kvmbins); ++i) { for (i = 0; i < ARRAY_CARDINALITY(kvmbins); ++i) {