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[Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux
From: |
Laszlo Ersek |
Subject: |
[Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs |
Date: |
Mon, 4 Mar 2013 23:19:57 +0100 |
Signed-off-by: Laszlo Ersek <address@hidden>
---
qga/commands-posix.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index d4b6bdc..1848df8 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -40,6 +40,7 @@ extern char **environ;
#include <arpa/inet.h>
#include <sys/socket.h>
#include <net/if.h>
+#include <inttypes.h>
#ifdef FIFREEZE
#define CONFIG_FSFREEZE
@@ -1178,7 +1179,57 @@ GuestLogicalProcessorList *qmp_guest_get_vcpus(Error
**errp)
void qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
{
+#if defined(__linux__)
+ const GuestLogicalProcessorList *entry;
+ Error *local_err = NULL;
+
+ for (entry = vcpus; local_err == NULL && entry != NULL;
+ entry = entry->next) {
+ const GuestLogicalProcessor *vcpu;
+
+ vcpu = entry->value;
+ if (vcpu->logical_id == 0) {
+ if (!vcpu->online) {
+ error_setg(&local_err,
+ "unable to offline logical processor #0");
+ }
+ } else {
+ char *buf;
+ FILE *f;
+
+ buf = g_strdup_printf("/sys/devices/system/cpu/cpu%"PRId64
+ "/online", vcpu->logical_id);
+ f = fopen(buf, "r+");
+ if (f == NULL) {
+ error_setg_errno(&local_err, errno, "fopen(\"%s\", \"r+\")",
+ buf);
+ } else {
+ unsigned online;
+
+ if (fscanf(f, "%u", &online) != 1) {
+ error_setg(&local_err, "failed to read or parse \"%s\"",
+ buf);
+ } else if ((online != 0) != vcpu->online) {
+ errno = 0;
+ rewind(f);
+ if (errno != 0 ||
+ fprintf(f, "%u\n", (unsigned)vcpu->online) < 0) {
+ error_setg_errno(&local_err, errno,
+ "rewind()/fprintf() on \"%s\"", buf);
+ }
+ }
+
+ if (fclose(f) == EOF && local_err == NULL) {
+ error_setg_errno(&local_err, errno, "fclose(\"%s\")", buf);
+ }
+ }
+ g_free(buf);
+ }
+ }
+ error_propagate(errp, local_err);
+#else
error_set(errp, QERR_UNSUPPORTED);
+#endif
}
/* register init/cleanup routines for stateful command groups */
--
1.7.1
- [Qemu-devel] [PATCH 0/3] qga/Linux: online/offline/query VCPUs via guest sysfs, Laszlo Ersek, 2013/03/04
- [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs,
Laszlo Ersek <=
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, mdroth, 2013/03/05
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Eric Blake, 2013/03/05
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Laszlo Ersek, 2013/03/05
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Eric Blake, 2013/03/05
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Laszlo Ersek, 2013/03/05
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Paolo Bonzini, 2013/03/06
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Eric Blake, 2013/03/06
[Qemu-devel] [PATCH 1/3] qga: introduce guest-get-vcpus / guest-set-vcpus with stubs, Laszlo Ersek, 2013/03/04