[libvirt] [PATCH v5 3/9] libxl: error out on not supported CPU mode, instead of silently ignoring
Daniel P. Berrangé
berrange at redhat.com
Fri Mar 16 17:39:35 UTC 2018
On Wed, Mar 14, 2018 at 03:26:10AM +0100, Marek Marczykowski-Górecki wrote:
> This change make libvirt XML with plain <cpu> element invalid for libxl,
> which affect not only upcoming CPUID support, but also NUMA. In fact,
> default mode 'custom' does not match what the driver actually does, so
> it was a bug. Adjust xenconfig driver accordingly.
> To not break existing configuration, add PostParse hook to update
> (previously ignored) default mode 'custom' to 'host-passthrough'.
Maybe I'm missing something, but by doing this silent conversion
from custom -> host-passthrough, don't you make it such that the
error about unsupported CPU mode is largely unreachable ? IOW seems
to end up with the same functional result as the original code,
except for a error when 'host-model' is used.
I don't have a particular better idea though if we have alot of
pre-existing usage with mode=custom ? Has this been widely
done, or can we justify breaking it ?
>
> Signed-off-by: Marek Marczykowski-Górecki <marmarek at invisiblethingslab.com>
> ---
> Changes since v4:
> - add PostParse hook to automatically set host-passthrough mode, if
> was the default one before (custom)
> Changes since v3:
> - fix vnuma tests (nested HVM implicitly enabled there)
> Changes since v2:
> - change separated from 'libxl: add support for CPUID features policy'
> ---
> src/libxl/libxl_conf.c | 10 ++++++++--
> src/libxl/libxl_domain.c | 5 +++++-
> src/xenconfig/xen_xl.c | 1 +-
> tests/xlconfigdata/test-fullvirt-vnuma-autocomplete.cfg | 1 +-
> tests/xlconfigdata/test-fullvirt-vnuma-autocomplete.xml | 2 +-
> tests/xlconfigdata/test-fullvirt-vnuma-nodistances.cfg | 1 +-
> tests/xlconfigdata/test-fullvirt-vnuma-nodistances.xml | 2 +-
> tests/xlconfigdata/test-fullvirt-vnuma-partialdist.cfg | 1 +-
> tests/xlconfigdata/test-fullvirt-vnuma-partialdist.xml | 2 +-
> tests/xlconfigdata/test-fullvirt-vnuma.cfg | 1 +-
> tests/xlconfigdata/test-fullvirt-vnuma.xml | 2 +-
> 11 files changed, 22 insertions(+), 6 deletions(-)
>
> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
> index e7727a1..9301731 100644
> --- a/src/libxl/libxl_conf.c
> +++ b/src/libxl/libxl_conf.c
> @@ -355,11 +355,17 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
> def->features[VIR_DOMAIN_FEATURE_ACPI] ==
> VIR_TRISTATE_SWITCH_ON);
>
> - if (caps &&
> - def->cpu && def->cpu->mode == (VIR_CPU_MODE_HOST_PASSTHROUGH)) {
> + if (caps && def->cpu) {
> bool hasHwVirt = false;
> bool svm = false, vmx = false;
>
> + if (def->cpu->mode != VIR_CPU_MODE_HOST_PASSTHROUGH) {
> + virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> + _("unsupported cpu mode '%s'"),
> + virCPUModeTypeToString(def->cpu->mode));
> + return -1;
> + }
> +
> if (ARCH_IS_X86(def->os.arch)) {
> vmx = virCPUCheckFeature(caps->host.arch, caps->host.cpu, "vmx");
> svm = virCPUCheckFeature(caps->host.arch, caps->host.cpu, "svm");
> diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
> index 8879481..98da68d 100644
> --- a/src/libxl/libxl_domain.c
> +++ b/src/libxl/libxl_domain.c
> @@ -414,6 +414,11 @@ libxlDomainDefPostParse(virDomainDefPtr def,
> def->features[VIR_DOMAIN_FEATURE_ACPI] = VIR_TRISTATE_SWITCH_ON;
> }
>
> + /* set default CPU mode to host-passthrough, as the only one supported by
> + * the driver */
> + if (def->cpu && def->cpu->mode == VIR_CPU_MODE_CUSTOM)
> + def->cpu->mode = VIR_CPU_MODE_HOST_PASSTHROUGH;
> +
> return 0;
> }
>
> diff --git a/src/xenconfig/xen_xl.c b/src/xenconfig/xen_xl.c
> index 2ef80eb..6cda305 100644
> --- a/src/xenconfig/xen_xl.c
> +++ b/src/xenconfig/xen_xl.c
> @@ -494,6 +494,7 @@ xenParseXLVnuma(virConfPtr conf,
> goto cleanup;
> }
>
> + cpu->mode = VIR_CPU_MODE_HOST_PASSTHROUGH;
> cpu->type = VIR_CPU_TYPE_GUEST;
> def->cpu = cpu;
>
> diff --git a/tests/xlconfigdata/test-fullvirt-vnuma-autocomplete.cfg b/tests/xlconfigdata/test-fullvirt-vnuma-autocomplete.cfg
> index edba69a..2c9de44 100644
> --- a/tests/xlconfigdata/test-fullvirt-vnuma-autocomplete.cfg
> +++ b/tests/xlconfigdata/test-fullvirt-vnuma-autocomplete.cfg
> @@ -22,5 +22,6 @@ parallel = "none"
> serial = "none"
> builder = "hvm"
> boot = "d"
> +nestedhvm = 1
> vnuma = [ [ "pnode=0", "size=2048", "vcpus=0,11", "vdistances=10,21,31,41,51,61" ], [ "pnode=1", "size=2048", "vcpus=1,10", "vdistances=21,10,21,31,41,51" ], [ "pnode=2", "size=2048", "vcpus=2,9", "vdistances=31,21,10,21,31,41" ], [ "pnode=3", "size=2048", "vcpus=3,8", "vdistances=41,31,21,10,21,31" ], [ "pnode=4", "size=2048", "vcpus=4,7", "vdistances=51,41,31,21,10,21" ], [ "pnode=5", "size=2048", "vcpus=5-6", "vdistances=61,51,41,31,21,10" ] ]
> disk = [ "format=raw,vdev=hda,access=rw,backendtype=phy,target=/dev/HostVG/XenGuest2" ]
> diff --git a/tests/xlconfigdata/test-fullvirt-vnuma-autocomplete.xml b/tests/xlconfigdata/test-fullvirt-vnuma-autocomplete.xml
> index e3639eb..3c486ad 100644
> --- a/tests/xlconfigdata/test-fullvirt-vnuma-autocomplete.xml
> +++ b/tests/xlconfigdata/test-fullvirt-vnuma-autocomplete.xml
> @@ -14,7 +14,7 @@
> <apic/>
> <pae/>
> </features>
> - <cpu>
> + <cpu mode='host-passthrough'>
> <numa>
> <cell id='0' cpus='0,11' memory='2097152' unit='KiB'>
> <distances>
> diff --git a/tests/xlconfigdata/test-fullvirt-vnuma-nodistances.cfg b/tests/xlconfigdata/test-fullvirt-vnuma-nodistances.cfg
> index 8186edf..ca8e5b0 100644
> --- a/tests/xlconfigdata/test-fullvirt-vnuma-nodistances.cfg
> +++ b/tests/xlconfigdata/test-fullvirt-vnuma-nodistances.cfg
> @@ -22,5 +22,6 @@ parallel = "none"
> serial = "none"
> builder = "hvm"
> boot = "d"
> +nestedhvm = 1
> vnuma = [ [ "pnode=0", "size=2048", "vcpus=0-1", "vdistances=10,20,20,20" ], [ "pnode=1", "size=2048", "vcpus=2-3", "vdistances=20,10,20,20" ], [ "pnode=2", "size=2048", "vcpus=4-5", "vdistances=20,20,10,20" ], [ "pnode=3", "size=2048", "vcpus=6-7", "vdistances=20,20,20,10" ] ]
> disk = [ "format=raw,vdev=hda,access=rw,backendtype=phy,target=/dev/HostVG/XenGuest2" ]
> diff --git a/tests/xlconfigdata/test-fullvirt-vnuma-nodistances.xml b/tests/xlconfigdata/test-fullvirt-vnuma-nodistances.xml
> index 9cab3ca..17c9ca5 100644
> --- a/tests/xlconfigdata/test-fullvirt-vnuma-nodistances.xml
> +++ b/tests/xlconfigdata/test-fullvirt-vnuma-nodistances.xml
> @@ -14,7 +14,7 @@
> <apic/>
> <pae/>
> </features>
> - <cpu>
> + <cpu mode='host-passthrough'>
> <numa>
> <cell id='0' cpus='0-1' memory='2097152' unit='KiB'/>
> <cell id='1' cpus='2-3' memory='2097152' unit='KiB'/>
> diff --git a/tests/xlconfigdata/test-fullvirt-vnuma-partialdist.cfg b/tests/xlconfigdata/test-fullvirt-vnuma-partialdist.cfg
> index 861a50e..46d5f90 100644
> --- a/tests/xlconfigdata/test-fullvirt-vnuma-partialdist.cfg
> +++ b/tests/xlconfigdata/test-fullvirt-vnuma-partialdist.cfg
> @@ -22,5 +22,6 @@ parallel = "none"
> serial = "none"
> builder = "hvm"
> boot = "d"
> +nestedhvm = 1
> vnuma = [ [ "pnode=0", "size=2048", "vcpus=0-1", "vdistances=10,21,31,41" ], [ "pnode=1", "size=2048", "vcpus=2-3", "vdistances=21,10,20,20" ], [ "pnode=2", "size=2048", "vcpus=4-5", "vdistances=31,20,10,20" ], [ "pnode=3", "size=2048", "vcpus=6-7", "vdistances=41,20,20,10" ] ]
> disk = [ "format=raw,vdev=hda,access=rw,backendtype=phy,target=/dev/HostVG/XenGuest2" ]
> diff --git a/tests/xlconfigdata/test-fullvirt-vnuma-partialdist.xml b/tests/xlconfigdata/test-fullvirt-vnuma-partialdist.xml
> index 084b889..291fc37 100644
> --- a/tests/xlconfigdata/test-fullvirt-vnuma-partialdist.xml
> +++ b/tests/xlconfigdata/test-fullvirt-vnuma-partialdist.xml
> @@ -14,7 +14,7 @@
> <apic/>
> <pae/>
> </features>
> - <cpu>
> + <cpu mode='host-passthrough'>
> <numa>
> <cell id='0' cpus='0-1' memory='2097152' unit='KiB'>
> <distances>
> diff --git a/tests/xlconfigdata/test-fullvirt-vnuma.cfg b/tests/xlconfigdata/test-fullvirt-vnuma.cfg
> index 91e233a..813ad7f 100644
> --- a/tests/xlconfigdata/test-fullvirt-vnuma.cfg
> +++ b/tests/xlconfigdata/test-fullvirt-vnuma.cfg
> @@ -22,5 +22,6 @@ parallel = "none"
> serial = "none"
> builder = "hvm"
> boot = "d"
> +nestedhvm = 1
> vnuma = [ [ "pnode=0", "size=2048", "vcpus=0-1", "vdistances=10,21,31,41" ], [ "pnode=1", "size=2048", "vcpus=2-3", "vdistances=21,10,21,31" ], [ "pnode=2", "size=2048", "vcpus=4-5", "vdistances=31,21,10,21" ], [ "pnode=3", "size=2048", "vcpus=6-7", "vdistances=41,31,21,10" ] ]
> disk = [ "format=raw,vdev=hda,access=rw,backendtype=phy,target=/dev/HostVG/XenGuest2" ]
> diff --git a/tests/xlconfigdata/test-fullvirt-vnuma.xml b/tests/xlconfigdata/test-fullvirt-vnuma.xml
> index 5368b0d..9a9f495 100644
> --- a/tests/xlconfigdata/test-fullvirt-vnuma.xml
> +++ b/tests/xlconfigdata/test-fullvirt-vnuma.xml
> @@ -14,7 +14,7 @@
> <apic/>
> <pae/>
> </features>
> - <cpu>
> + <cpu mode='host-passthrough'>
> <numa>
> <cell id='0' cpus='0-1' memory='2097152' unit='KiB'>
> <distances>
> --
> git-series 0.9.1
>
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Regards,
Daniel
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