https://github.com/torvalds/linux
Provide a new KVM capability that allows bits within MSRs to be recognized as features. Two new ioctls are added to the /dev/kvm ioctl routine to retrieve the list of these MSRs and then retrieve their values. A kvm_x86_ops callback is used to determine support for the listed MSR-based features. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> [Tweaked documentation. - Radim] Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
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KVM: x86: Add a framework for supporting MSR-based features
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/memory.h>
#include "notifier-error-inject.h"
static int priority;
module_param(priority, int, 0);
MODULE_PARM_DESC(priority, "specify memory notifier priority");
static struct notifier_err_inject memory_notifier_err_inject = {
.actions = {
{ NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_ONLINE) },
{ NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_OFFLINE) },
{}
}
};
static struct dentry *dir;
static int err_inject_init(void)
{
int err;
dir = notifier_err_inject_init("memory", notifier_err_inject_dir,
&memory_notifier_err_inject, priority);
if (IS_ERR(dir))
return PTR_ERR(dir);
err = register_memory_notifier(&memory_notifier_err_inject.nb);
if (err)
debugfs_remove_recursive(dir);
return err;
}
static void err_inject_exit(void)
{
unregister_memory_notifier(&memory_notifier_err_inject.nb);
debugfs_remove_recursive(dir);
}
module_init(err_inject_init);
module_exit(err_inject_exit);
MODULE_DESCRIPTION("memory notifier error injection module");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
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