[libvirt PATCH 4/8] cpu: Run arch specific code for virCPUUpdate for all custom CPUs
Jiri Denemark
jdenemar at redhat.com
Fri Nov 20 19:39:03 UTC 2020
Until now, the function returned immediately when the guest CPU
definition did not use optional features or minimum match. Clearly,
there's nothing to be updated according to the host CPU in this case,
but the arch specific code may still want to do some compatibility
updates based on the model and features used in the guest CPU
definition.
Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
---
src/cpu/cpu.c | 52 +++++++++++++++++++++++++--------------------
src/cpu/cpu.h | 3 ++-
src/cpu/cpu_arm.c | 5 +++--
src/cpu/cpu_ppc64.c | 3 ++-
src/cpu/cpu_s390.c | 6 +++++-
src/cpu/cpu_x86.c | 6 +++++-
6 files changed, 46 insertions(+), 29 deletions(-)
diff --git a/src/cpu/cpu.c b/src/cpu/cpu.c
index bf94811960..44094bd0df 100644
--- a/src/cpu/cpu.c
+++ b/src/cpu/cpu.c
@@ -538,12 +538,11 @@ virCPUBaseline(virArch arch,
* @guest: guest CPU definition to be updated
* @host: host CPU definition
*
- * Updates @guest CPU definition according to @host CPU. This is required to
- * support guest CPU definitions specified relatively to host CPU, such as
- * CPUs with VIR_CPU_MODE_CUSTOM and optional features or
- * VIR_CPU_MATCH_MINIMUM, or CPUs with VIR_CPU_MODE_HOST_MODEL.
- * When the guest CPU was not specified relatively, the function does nothing
- * and returns success.
+ * Updates @guest CPU definition possibly taking @host CPU into account. This
+ * is required for maintaining compatibility with older libvirt releases or to
+ * support guest CPU definitions specified relatively to host CPU, such as CPUs
+ * with VIR_CPU_MODE_CUSTOM and optional features or VIR_CPU_MATCH_MINIMUM, or
+ * CPUs with VIR_CPU_MODE_HOST_MODEL.
*
* Returns 0 on success, -1 on error.
*/
@@ -553,6 +552,7 @@ virCPUUpdate(virArch arch,
const virCPUDef *host)
{
struct cpuArchDriver *driver;
+ bool relative;
VIR_DEBUG("arch=%s, guest=%p mode=%s model=%s, host=%p model=%s",
virArchToString(arch), guest, virCPUModeTypeToString(guest->mode),
@@ -561,30 +561,36 @@ virCPUUpdate(virArch arch,
if (!(driver = cpuGetSubDriver(arch)))
return -1;
- if (guest->mode == VIR_CPU_MODE_HOST_PASSTHROUGH)
+ switch ((virCPUMode) guest->mode) {
+ case VIR_CPU_MODE_HOST_PASSTHROUGH:
return 0;
- if (guest->mode == VIR_CPU_MODE_CUSTOM &&
- guest->match != VIR_CPU_MATCH_MINIMUM) {
- size_t i;
- bool optional = false;
+ case VIR_CPU_MODE_HOST_MODEL:
+ relative = true;
+ break;
- for (i = 0; i < guest->nfeatures; i++) {
- if (guest->features[i].policy == VIR_CPU_FEATURE_OPTIONAL) {
- optional = true;
- break;
+ case VIR_CPU_MODE_CUSTOM:
+ if (guest->match == VIR_CPU_MATCH_MINIMUM) {
+ relative = true;
+ } else {
+ size_t i;
+
+ relative = false;
+ for (i = 0; i < guest->nfeatures; i++) {
+ if (guest->features[i].policy == VIR_CPU_FEATURE_OPTIONAL) {
+ relative = true;
+ break;
+ }
}
}
+ break;
- if (!optional)
- return 0;
+ case VIR_CPU_MODE_LAST:
+ default:
+ virReportEnumRangeError(virCPUMode, guest->mode);
+ return -1;
}
- /* We get here if guest CPU is either
- * - host-model
- * - custom with minimum match
- * - custom with optional features
- */
if (!driver->update) {
virReportError(VIR_ERR_NO_SUPPORT,
_("cannot update guest CPU for %s architecture"),
@@ -592,7 +598,7 @@ virCPUUpdate(virArch arch,
return -1;
}
- if (driver->update(guest, host) < 0)
+ if (driver->update(guest, host, relative) < 0)
return -1;
VIR_DEBUG("model=%s", NULLSTR(guest->model));
diff --git a/src/cpu/cpu.h b/src/cpu/cpu.h
index cc2d132275..ff4fb7e103 100644
--- a/src/cpu/cpu.h
+++ b/src/cpu/cpu.h
@@ -79,7 +79,8 @@ typedef virCPUDefPtr
typedef int
(*virCPUArchUpdate)(virCPUDefPtr guest,
- const virCPUDef *host);
+ const virCPUDef *host,
+ bool relative);
typedef int
(*virCPUArchUpdateLive)(virCPUDefPtr cpu,
diff --git a/src/cpu/cpu_arm.c b/src/cpu/cpu_arm.c
index 31997b59cd..8a408a324a 100644
--- a/src/cpu/cpu_arm.c
+++ b/src/cpu/cpu_arm.c
@@ -415,11 +415,12 @@ virCPUarmGetMap(void)
static int
virCPUarmUpdate(virCPUDefPtr guest,
- const virCPUDef *host)
+ const virCPUDef *host,
+ bool relative)
{
g_autoptr(virCPUDef) updated = NULL;
- if (guest->mode != VIR_CPU_MODE_HOST_MODEL)
+ if (!relative || guest->mode != VIR_CPU_MODE_HOST_MODEL)
return 0;
if (!host) {
diff --git a/src/cpu/cpu_ppc64.c b/src/cpu/cpu_ppc64.c
index 555eeecbe7..d71d147207 100644
--- a/src/cpu/cpu_ppc64.c
+++ b/src/cpu/cpu_ppc64.c
@@ -614,7 +614,8 @@ virCPUppc64GetHost(virCPUDefPtr cpu,
static int
virCPUppc64Update(virCPUDefPtr guest,
- const virCPUDef *host G_GNUC_UNUSED)
+ const virCPUDef *host G_GNUC_UNUSED,
+ bool relative G_GNUC_UNUSED)
{
/*
* - host-passthrough doesn't even get here
diff --git a/src/cpu/cpu_s390.c b/src/cpu/cpu_s390.c
index c1c5686244..17321dc04a 100644
--- a/src/cpu/cpu_s390.c
+++ b/src/cpu/cpu_s390.c
@@ -43,11 +43,15 @@ virCPUs390Compare(virCPUDefPtr host G_GNUC_UNUSED,
static int
virCPUs390Update(virCPUDefPtr guest,
- const virCPUDef *host)
+ const virCPUDef *host,
+ bool relative)
{
g_autoptr(virCPUDef) updated = NULL;
size_t i;
+ if (!relative)
+ return 0;
+
if (guest->mode == VIR_CPU_MODE_CUSTOM) {
if (guest->match == VIR_CPU_MATCH_MINIMUM) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
index 0e533c62e1..72f17070e1 100644
--- a/src/cpu/cpu_x86.c
+++ b/src/cpu/cpu_x86.c
@@ -2936,12 +2936,16 @@ x86UpdateHostModel(virCPUDefPtr guest,
static int
virCPUx86Update(virCPUDefPtr guest,
- const virCPUDef *host)
+ const virCPUDef *host,
+ bool relative)
{
g_autoptr(virCPUx86Model) model = NULL;
virCPUx86MapPtr map;
size_t i;
+ if (!relative)
+ return 0;
+
if (!host) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("unknown host CPU model"));
--
2.29.2
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