qemu: Add support for guest CPU cache

This patch maps /domain/cpu/cache element into -cpu parameters: - <cache mode='passthrough'/> is translated to host-cache-info=on - <cache level='3' mode='emulate'/> is transformed into l3-cache=on - <cache mode='disable'/> is turned in host-cache-info=off,l3-cache=off Any other <cache> element is forbidden. The tricky part is detecting whether QEMU supports the CPU properties. The 'host-cache-info' property is introduced in v2.4.0-1389-ge265e3e480, earlier QEMU releases enabled host-cache-info by default and had no way to disable it. If the property is present, it defaults to 'off' for any QEMU until at least 2.9.0. The 'l3-cache' property was introduced later by v2.7.0-200-g14c985cffa. Earlier versions worked as if l3-cache=off was passed. For any QEMU until at least 2.9.0 l3-cache is 'off' by default. QEMU 2.9.0 was the first release which supports probing both properties by running device-list-properties with typename=host-x86_64-cpu. Older QEMU releases did not support device-list-properties command for CPU devices. Thus we can't really rely on probing them and we can just use query-cpu-model-expansion QMP command as a witness. Because the cache property probing is only reliable for QEMU >= 2.9.0 when both are already supported for quite a few releases, we let QEMU report an error if a specific cache mode is explicitly requested. The other mode (or both if a user requested CPU cache to be disabled) is explicitly turned off for QEMU >= 2.9.0 to avoid any surprises in case the QEMU defaults change. Any older QEMU already turns them off so not doing so explicitly does not make any harm. Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
2024-12-22 17:34:18 +03:00 · 2017-04-25 19:07:19 +02:00 · 2017-04-25 19:07:19 +02:00 · df13c0b477
commit df13c0b477
parent a646a6016a
21 changed files with 417 additions and 0 deletions
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@ -364,6 +364,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
              "query-cpu-definitions", /* 250 */
              "block-write-threshold",
              "query-named-block-nodes",
+              "cpu-cache",
    );


@ -4787,6 +4788,10 @@ virQEMUCapsInitQMPMonitor(virQEMUCapsPtr qemuCaps,
        virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_NVDIMM))
        virQEMUCapsClear(qemuCaps, QEMU_CAPS_DEVICE_NVDIMM);

+    if (ARCH_IS_X86(qemuCaps->arch) &&
+        virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_MODEL_EXPANSION))
+        virQEMUCapsSet(qemuCaps, QEMU_CAPS_CPU_CACHE);
+
    ret = 0;
 cleanup:
    return ret;
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@ -401,6 +401,7 @@ typedef enum {
    QEMU_CAPS_QUERY_CPU_DEFINITIONS, /* qmp query-cpu-definitions */
    QEMU_CAPS_BLOCK_WRITE_THRESHOLD, /* BLOCK_WRITE_THRESHOLD event */
    QEMU_CAPS_QUERY_NAMED_BLOCK_NODES, /* qmp query-named-block-nodes */
+    QEMU_CAPS_CPU_CACHE, /* -cpu supports host-cache-info and l3-cache properties */

    QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@ -7063,6 +7063,45 @@ qemuBuildCpuCommandLine(virCommandPtr cmd,
        have_cpu = true;
    }

+    if (def->cpu && def->cpu->cache) {
+        virCPUCacheDefPtr cache = def->cpu->cache;
+        bool hostOff = false;
+        bool l3Off = false;
+
+        if (!have_cpu) {
+            virBufferAdd(&buf, default_model, -1);
+            have_cpu = true;
+        }
+
+        switch (cache->mode) {
+        case VIR_CPU_CACHE_MODE_EMULATE:
+            virBufferAddLit(&buf, ",l3-cache=on");
+            hostOff = true;
+            break;
+
+        case VIR_CPU_CACHE_MODE_PASSTHROUGH:
+            virBufferAddLit(&buf, ",host-cache-info=on");
+            l3Off = true;
+            break;
+
+        case VIR_CPU_CACHE_MODE_DISABLE:
+            hostOff = l3Off = true;
+            break;
+
+        case VIR_CPU_CACHE_MODE_LAST:
+            break;
+        }
+
+        if (hostOff &&
+            def->cpu->mode == VIR_CPU_MODE_HOST_PASSTHROUGH &&
+            virQEMUCapsGet(qemuCaps, QEMU_CAPS_CPU_CACHE))
+            virBufferAddLit(&buf, ",host-cache-info=off");
+
+        if (l3Off &&
+            virQEMUCapsGet(qemuCaps, QEMU_CAPS_CPU_CACHE))
+            virBufferAddLit(&buf, ",l3-cache=off");
+    }
+
    if (virBufferCheckError(&buf) < 0)
        goto cleanup;

--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@ -2719,6 +2719,60 @@ qemuDomainDefCPUPostParse(virDomainDefPtr def)
    if (!def->cpu)
        return 0;

+    if (def->cpu->cache) {
+        virCPUCacheDefPtr cache = def->cpu->cache;
+
+        if (!ARCH_IS_X86(def->os.arch)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("CPU cache specification is not supported "
+                             "for '%s' architecture"),
+                           virArchToString(def->os.arch));
+            return -1;
+        }
+
+        switch (cache->mode) {
+        case VIR_CPU_CACHE_MODE_EMULATE:
+            if (cache->level != 3) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("CPU cache mode '%s' can only be used with "
+                                 "level='3'"),
+                               virCPUCacheModeTypeToString(cache->mode));
+                return -1;
+            }
+            break;
+
+        case VIR_CPU_CACHE_MODE_PASSTHROUGH:
+            if (def->cpu->mode != VIR_CPU_MODE_HOST_PASSTHROUGH) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("CPU cache mode '%s' can only be used with "
+                                 "'%s' CPUs"),
+                               virCPUCacheModeTypeToString(cache->mode),
+                               virCPUModeTypeToString(VIR_CPU_MODE_HOST_PASSTHROUGH));
+                return -1;
+            }
+
+            if (cache->level != -1) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("unsupported CPU cache level for mode '%s'"),
+                               virCPUCacheModeTypeToString(cache->mode));
+                return -1;
+            }
+            break;
+
+        case VIR_CPU_CACHE_MODE_DISABLE:
+            if (cache->level != -1) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("unsupported CPU cache level for mode '%s'"),
+                               virCPUCacheModeTypeToString(cache->mode));
+                return -1;
+            }
+            break;
+
+        case VIR_CPU_CACHE_MODE_LAST:
+            break;
+        }
+    }
+
    /* Nothing to be done if only CPU topology is specified. */
    if (def->cpu->mode == VIR_CPU_MODE_CUSTOM &&
        !def->cpu->model)
--- a/tests/qemucapabilitiesdata/caps_2.9.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.9.0.x86_64.xml
@ -208,6 +208,7 @@
  <flag name='query-cpu-definitions'/>
  <flag name='block-write-threshold'/>
  <flag name='query-named-block-nodes'/>
+  <flag name='cpu-cache'/>
  <version>2009000</version>
  <kvmVersion>0</kvmVersion>
  <package> (v2.9.0)</package>
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable.args
@ -0,0 +1,21 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name foo \
+-S \
+-M pc \
+-cpu host,host-cache-info=off,l3-cache=off \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-foo/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable.xml
@ -0,0 +1,20 @@
+<domain type='kvm'>
+  <name>foo</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='host-passthrough'>
+    <cache mode='disable'/>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+  </devices>
+</domain>
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable2.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable2.args
@ -0,0 +1,21 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name foo \
+-S \
+-M pc \
+-cpu host \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-foo/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable2.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable2.xml
@ -0,0 +1,20 @@
+<domain type='kvm'>
+  <name>foo</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='host-passthrough'>
+    <cache mode='disable'/>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+  </devices>
+</domain>
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable3.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable3.args
@ -0,0 +1,22 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name foo \
+-S \
+-M pc \
+-cpu core2duo,+ds,+acpi,+ss,+ht,+tm,+pbe,+ds_cpl,+vmx,+est,+tm2,+cx16,+xtpr,\
+lahf_lm,l3-cache=off \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-foo/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable3.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-disable3.xml
@ -0,0 +1,20 @@
+<domain type='kvm'>
+  <name>foo</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='host-model'>
+    <cache mode='disable'/>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+  </devices>
+</domain>
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-emulate-l2.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-emulate-l2.xml
@ -0,0 +1,20 @@
+<domain type='kvm'>
+  <name>foo</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='host-model' check='full'>
+    <cache level='2' mode='emulate'/>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+  </devices>
+</domain>
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-emulate-l3.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-emulate-l3.args
@ -0,0 +1,21 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name foo \
+-S \
+-M pc \
+-cpu host,l3-cache=on,host-cache-info=off \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-foo/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-emulate-l3.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-emulate-l3.xml
@ -0,0 +1,20 @@
+<domain type='kvm'>
+  <name>foo</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='host-passthrough'>
+    <cache level='3' mode='emulate'/>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+  </devices>
+</domain>
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough-l3.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough-l3.xml
@ -0,0 +1,20 @@
+<domain type='kvm'>
+  <name>foo</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='host-passthrough'>
+    <cache level='3' mode='passthrough'/>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+  </devices>
+</domain>
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough.args
@ -0,0 +1,21 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name foo \
+-S \
+-M pc \
+-cpu host,host-cache-info=on,l3-cache=off \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-foo/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough.xml
@ -0,0 +1,20 @@
+<domain type='kvm'>
+  <name>foo</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='host-passthrough'>
+    <cache mode='passthrough'/>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+  </devices>
+</domain>
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough2.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough2.args
@ -0,0 +1,21 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name foo \
+-S \
+-M pc \
+-cpu host,host-cache-info=on \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-foo/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough2.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough2.xml
@ -0,0 +1,20 @@
+<domain type='kvm'>
+  <name>foo</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='host-passthrough'>
+    <cache mode='passthrough'/>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+  </devices>
+</domain>
--- a/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough3.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-cache-passthrough3.xml
@ -0,0 +1,20 @@
+<domain type='kvm'>
+  <name>foo</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='host-model'>
+    <cache mode='passthrough'/>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+  </devices>
+</domain>
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@ -2513,6 +2513,16 @@ mymain(void)
    DO_TEST("cpu-check-default-partial", QEMU_CAPS_KVM);
    DO_TEST("cpu-check-default-partial2", QEMU_CAPS_KVM);

+    DO_TEST("cpu-cache-disable", QEMU_CAPS_KVM, QEMU_CAPS_CPU_CACHE);
+    DO_TEST("cpu-cache-disable2", QEMU_CAPS_KVM);
+    DO_TEST("cpu-cache-disable3", QEMU_CAPS_KVM, QEMU_CAPS_CPU_CACHE);
+    DO_TEST("cpu-cache-passthrough", QEMU_CAPS_KVM, QEMU_CAPS_CPU_CACHE);
+    DO_TEST("cpu-cache-passthrough2", QEMU_CAPS_KVM);
+    DO_TEST("cpu-cache-emulate-l3", QEMU_CAPS_KVM, QEMU_CAPS_CPU_CACHE);
+    DO_TEST_PARSE_ERROR("cpu-cache-emulate-l2", QEMU_CAPS_KVM);
+    DO_TEST_PARSE_ERROR("cpu-cache-passthrough3", QEMU_CAPS_KVM);
+    DO_TEST_PARSE_ERROR("cpu-cache-passthrough-l3", QEMU_CAPS_KVM);
+
    qemuTestDriverFree(&driver);

    return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;