By using: export LIBGUESTFS_BACKEND_SETTINGS=force_kvm you can force the backend to use KVM and never fall back to TCG (software emulation). --- lib/guestfs.pod | 9 +++++++++ lib/launch-direct.c | 26 +++++++++++++++++++++++--- lib/launch-libvirt.c | 15 ++++++++++++++- 3 files changed, 46 insertions(+), 4 deletions(-) diff --git a/lib/guestfs.pod b/lib/guestfs.pod index d746a41b1..a17e2e689 100644 --- a/lib/guestfs.pod +++ b/lib/guestfs.pod @@ -1529,6 +1529,15 @@ Using: will force the direct and libvirt backends to use TCG (software emulation) instead of KVM (hardware accelerated virtualization). +=head3 force_kvm + +Using: + + export LIBGUESTFS_BACKEND_SETTINGS=force_kvm + +will force the direct and libvirt backends to use KVM (hardware +accelerated virtualization) instead of TCG (software emulation). + =head3 gdb The direct backend supports: diff --git a/lib/launch-direct.c b/lib/launch-direct.c index b6ed9766f..aae5b8f4b 100644 --- a/lib/launch-direct.c +++ b/lib/launch-direct.c @@ -385,6 +385,8 @@ launch_direct (guestfs_h *g, void *datav, const char *arg) struct hv_param *hp; bool has_kvm; int force_tcg; + int force_kvm; + const char *accel_val = "kvm:tcg"; const char *cpu_model; CLEANUP_FREE char *append = NULL; CLEANUP_FREE_STRING_LIST char **argv = NULL; @@ -433,9 +435,27 @@ launch_direct (guestfs_h *g, void *datav, const char *arg) force_tcg = guestfs_int_get_backend_setting_bool (g, "force_tcg"); if (force_tcg == -1) return -1; + else if (force_tcg) + accel_val = "tcg"; - if (!has_kvm && !force_tcg) - debian_kvm_warning (g); + force_kvm = guestfs_int_get_backend_setting_bool (g, "force_kvm"); + if (force_kvm == -1) + return -1; + else if (force_kvm) + accel_val = "kvm"; + + if (force_kvm && force_tcg) { + error (g, "Both force_kvm and force_tcg backend settings supplied."); + return -1; + } + if (!has_kvm) { + if (!force_tcg) + debian_kvm_warning (g); + if (force_kvm) { + error (g, "force_kvm supplied but kvm not available."); + return -1; + } + } /* Using virtio-serial, we need to create a local Unix domain socket * for qemu to connect to. @@ -530,7 +550,7 @@ launch_direct (guestfs_h *g, void *datav, const char *arg) if (has_kvm && !force_tcg) append_list ("gic-version=host"); #endif - append_list_format ("accel=%s", !force_tcg ? "kvm:tcg" : "tcg"); + append_list_format ("accel=%s", accel_val); } end_list (); cpu_model = guestfs_int_get_cpu_model (has_kvm && !force_tcg); diff --git a/lib/launch-libvirt.c b/lib/launch-libvirt.c index 6c0cfe937..a52f6ec4f 100644 --- a/lib/launch-libvirt.c +++ b/lib/launch-libvirt.c @@ -773,6 +773,7 @@ parse_capabilities (guestfs_h *g, const char *capabilities_xml, xmlAttrPtr attr; size_t seen_qemu, seen_kvm; int force_tcg; + int force_kvm; doc = xmlReadMemory (capabilities_xml, strlen (capabilities_xml), NULL, NULL, XML_PARSE_NONET); @@ -820,11 +821,15 @@ parse_capabilities (guestfs_h *g, const char *capabilities_xml, } } + force_kvm = guestfs_int_get_backend_setting_bool (g, "force_kvm"); + if (force_kvm == -1) + return -1; + /* This was RHBZ#886915: in that case the default libvirt URI * pointed to a Xen hypervisor, and so could not create the * appliance VM. */ - if (!seen_qemu && !seen_kvm) { + if ((!seen_qemu || force_kvm) && !seen_kvm) { CLEANUP_FREE char *backend = guestfs_get_backend (g); error (g, @@ -846,6 +851,14 @@ parse_capabilities (guestfs_h *g, const char *capabilities_xml, if (force_tcg == -1) return -1; + if (force_kvm && force_tcg) { + error (g, "Both force_kvm and force_tcg backend settings supplied."); + return -1; + } + + /* if force_kvm then seen_kvm */ + assert (!force_kvm || seen_kvm); + if (!force_tcg) data->is_kvm = seen_kvm; else -- 2.31.0.rc2.261.g7f71774620-goog