From c3be8bb4235b447dc29568f96b8c31cc741fc358 Mon Sep 17 00:00:00 2001 From: Andrea Bolognani Date: Thu, 13 Sep 2018 16:56:55 +0200 Subject: [PATCH] qemu: Clarify QEMU_CAPS_KVM This capability is documented as having one meaning (whether KVM is enabled by default) but is actually assigned two other meanings over its life: whether the query-kvm QMP command is available at first, and later on whether KVM is usable / was used during probing. Since the query-kvm QMP command was available in 1.5.0, we can avoid probing for it; additionally, we can simplify the logic by setting the flag when it applies instead of initially setting it and then clearing it when it doesn't. The flag's description is also updated to reflect reality. Signed-off-by: Andrea Bolognani Reviewed-by: Jiri Denemark --- src/qemu/qemu_capabilities.c | 19 ++----------------- src/qemu/qemu_capabilities.h | 2 +- 2 files changed, 3 insertions(+), 18 deletions(-) diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index b1825534c9..94fb062d01 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -1004,7 +1004,6 @@ struct virQEMUCapsStringFlags virQEMUCapsCommands[] = { { "block-stream", QEMU_CAPS_BLOCKJOB_ASYNC }, { "dump-guest-memory", QEMU_CAPS_DUMP_GUEST_MEMORY }, { "query-spice", QEMU_CAPS_SPICE }, - { "query-kvm", QEMU_CAPS_KVM }, { "block-commit", QEMU_CAPS_BLOCK_COMMIT }, { "query-vnc", QEMU_CAPS_VNC }, { "drive-mirror", QEMU_CAPS_DRIVE_MIRROR }, @@ -2621,25 +2620,11 @@ virQEMUCapsProbeQMPKVMState(virQEMUCapsPtr qemuCaps, bool enabled = false; bool present = false; - if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM)) - return 0; - if (qemuMonitorGetKVMState(mon, &enabled, &present) < 0) return -1; - /* The QEMU_CAPS_KVM flag was initially set according to the QEMU - * reporting the recognition of 'query-kvm' QMP command. That merely - * indicates existence of the command though, not whether KVM support - * is actually available, nor whether it is enabled by default. - * - * If it is not present we need to clear the flag, and if it is - * not enabled by default we need to change the flag. - */ - if (!present) { - virQEMUCapsClear(qemuCaps, QEMU_CAPS_KVM); - } else if (!enabled) { - virQEMUCapsClear(qemuCaps, QEMU_CAPS_KVM); - } + if (present && enabled) + virQEMUCapsSet(qemuCaps, QEMU_CAPS_KVM); return 0; } diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h index f00d790542..e671f74ebb 100644 --- a/src/qemu/qemu_capabilities.h +++ b/src/qemu/qemu_capabilities.h @@ -65,7 +65,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */ X_QEMU_CAPS_MIGRATE_QEMU_TCP, /* have qemu tcp migration */ X_QEMU_CAPS_MIGRATE_QEMU_EXEC, /* have qemu exec migration */ X_QEMU_CAPS_DRIVE_CACHE_V2, /* cache= flag wanting new v2 values */ - QEMU_CAPS_KVM, /* Whether KVM is enabled by default */ + QEMU_CAPS_KVM, /* Whether KVM is usable / was used during probing */ X_QEMU_CAPS_DRIVE_FORMAT, /* Is -drive format= avail */ /* 15 */