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runtime: current vcpu number should be limited

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The physical current vcpu number should not be used directly as the
largest vcpu number is limited to defaultMaxQemuVCPUs.
Here, a new helper is introduced in pkg/katautils/config.go to get
current vcpu number.

Fixes: #2809
Signed-off-by: Jianyong Wu <jianyong.wu@arm.com>
This commit is contained in:
Jianyong Wu 2021-10-15 13:25:26 +08:00
parent fa922517d9
commit c59c36732b
2 changed files with 23 additions and 11 deletions
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17
src/runtime/pkg/katautils/config.go
View File

@ -307,11 +307,24 @@ func (h hypervisor) GetEntropySource() string {
return h.EntropySource
}
// Current cpu number should not larger than defaultMaxVCPUs()
func getCurrentCpuNum() uint32 {
var cpu uint32
h := hypervisor{}
cpu = uint32(goruntime.NumCPU())
if cpu > h.defaultMaxVCPUs() {
cpu = h.defaultMaxVCPUs()
}
return cpu
}
func (h hypervisor) defaultVCPUs() uint32 {
numCPUs := goruntime.NumCPU()
numCPUs := getCurrentCpuNum()
if h.NumVCPUs < 0 || h.NumVCPUs > int32(numCPUs) {
return uint32(numCPUs)
return numCPUs
}
if h.NumVCPUs == 0 { // or unspecified
return defaultVCPUCount

17
src/runtime/pkg/katautils/config_test.go
View File

@ -14,7 +14,6 @@ import (
"path"
"path/filepath"
"reflect"
goruntime "runtime"
"strings"
"syscall"
"testing"
@ -156,7 +155,7 @@ func createAllRuntimeConfigFiles(dir, hypervisor string) (config testRuntimeConf
KernelParams: vc.DeserializeParams(strings.Fields(kernelParams)),
HypervisorMachineType: machineType,
NumVCPUs: defaultVCPUCount,
DefaultMaxVCPUs: uint32(goruntime.NumCPU()),
DefaultMaxVCPUs: getCurrentCpuNum(),
MemorySize: defaultMemSize,
DisableBlockDeviceUse: disableBlockDevice,
BlockDeviceDriver: defaultBlockDeviceDriver,
@ -919,13 +918,13 @@ func TestNewClhHypervisorConfig(t *testing.T) {
func TestHypervisorDefaults(t *testing.T) {
assert := assert.New(t)
numCPUs := goruntime.NumCPU()
numCPUs := getCurrentCpuNum()
h := hypervisor{}
assert.Equal(h.machineType(), defaultMachineType, "default hypervisor machine type wrong")
assert.Equal(h.defaultVCPUs(), defaultVCPUCount, "default vCPU number is wrong")
assert.Equal(h.defaultMaxVCPUs(), uint32(numCPUs), "default max vCPU number is wrong")
assert.Equal(h.defaultMaxVCPUs(), numCPUs, "default max vCPU number is wrong")
assert.Equal(h.defaultMemSz(), defaultMemSize, "default memory size is wrong")
machineType := "foo"
@ -934,23 +933,23 @@ func TestHypervisorDefaults(t *testing.T) {
// auto inferring
h.NumVCPUs = -1
assert.Equal(h.defaultVCPUs(), uint32(numCPUs), "default vCPU number is wrong")
assert.Equal(h.defaultVCPUs(), numCPUs, "default vCPU number is wrong")
h.NumVCPUs = 2
assert.Equal(h.defaultVCPUs(), uint32(2), "default vCPU number is wrong")
h.NumVCPUs = int32(numCPUs) + 1
assert.Equal(h.defaultVCPUs(), uint32(numCPUs), "default vCPU number is wrong")
assert.Equal(h.defaultVCPUs(), numCPUs, "default vCPU number is wrong")
h.DefaultMaxVCPUs = 2
assert.Equal(h.defaultMaxVCPUs(), uint32(2), "default max vCPU number is wrong")
h.DefaultMaxVCPUs = uint32(numCPUs) + 1
assert.Equal(h.defaultMaxVCPUs(), uint32(numCPUs), "default max vCPU number is wrong")
h.DefaultMaxVCPUs = numCPUs + 1
assert.Equal(h.defaultMaxVCPUs(), numCPUs, "default max vCPU number is wrong")
maxvcpus := vc.MaxQemuVCPUs()
h.DefaultMaxVCPUs = maxvcpus + 1
assert.Equal(h.defaultMaxVCPUs(), uint32(numCPUs), "default max vCPU number is wrong")
assert.Equal(h.defaultMaxVCPUs(), numCPUs, "default max vCPU number is wrong")
h.MemorySize = 1024
assert.Equal(h.defaultMemSz(), uint32(1024), "default memory size is wrong")