Re: [libvirt] PATCH: recent qemu-kvm requires -enable-kvm flag to activate VT optimization

diff -upr libvirt/src/qemu/qemu_conf.c libvirt-enableKVM/src/qemu/qemu_conf.c --- libvirt/src/qemu/qemu_conf.c 2009-11-15 18:23:34.132206179 -0800 +++ libvirt-enableKVM/src/qemu/qemu_conf.c 2009-11-16 02:13:08.060515632 -0800 @@ -878,6 +878,8 @@ static unsigned int qemudComputeCmdFlags flags |= QEMUD_CMD_FLAG_KQEMU; if (strstr(help, "-no-kvm")) flags |= QEMUD_CMD_FLAG_KVM; + if (strstr(help, "-enable-kvm")) + flags |= QEMUD_CMD_FLAG_ENABLE_KVM; if (strstr(help, "-no-reboot")) flags |= QEMUD_CMD_FLAG_NO_REBOOT; if (strstr(help, "-name")) @@ -1595,6 +1597,7 @@ int qemudBuildCommandLine(virConnectPtr struct utsname ut; int disableKQEMU = 0; int disableKVM = 0; + int enableKVM = 0; int qargc = 0, qarga = 0; const char **qargv = NULL; int qenvc = 0, qenva = 0; @@ -1653,6 +1656,15 @@ int qemudBuildCommandLine(virConnectPtr def->virtType == VIR_DOMAIN_VIRT_QEMU) disableKVM = 1; + /* Should explicitly enable KVM if + * 1. Guest domain is 'qemu'

+ * 2. The qemu binary has the -enable-kvm flag + * NOTE: user must be responsible to load the kvm modules + */ + if ((qemuCmdFlags & QEMUD_CMD_FLAG_ENABLE_KVM) && + def->virtType == VIR_DOMAIN_VIRT_QEMU)

+ enableKVM = 1; + /* * Need to force a 32-bit guest CPU type if * @@ -1780,6 +1792,8 @@ int qemudBuildCommandLine(virConnectPtr ADD_ARG_LIT("-no-kqemu"); if (disableKVM) ADD_ARG_LIT("-no-kvm"); + if (enableKVM) + ADD_ARG_LIT("-enable-kvm"); ADD_ARG_LIT("-m"); ADD_ARG_LIT(memory); if (def->hugepage_backed) {