diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 10 | ||||
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 5 |
2 files changed, 13 insertions, 2 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 254bfafdcbcd..ef66b3c45ba2 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5804,8 +5804,9 @@ panic() code such as dumping handler. xen_nopvspin [X86,XEN] - Disables the ticketlock slowpath using Xen PV - optimizations. + Disables the qspinlock slowpath using Xen PV optimizations. + This parameter is obsoleted by "nopvspin" parameter, which + has equivalent effect for XEN platform. xen_nopv [X86] Disables the PV optimizations forcing the HVM guest to @@ -5831,6 +5832,11 @@ as generic guest with no PV drivers. Currently support XEN HVM, KVM, HYPER_V and VMWARE guest. + nopvspin [X86,XEN,KVM] + Disables the qspinlock slow path using PV optimizations + which allow the hypervisor to 'idle' the guest on lock + contention. + xirc2ps_cs= [NET,PCMCIA] Format: <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index fe05201e17be..cdfd98155311 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -669,6 +669,10 @@ MSRs that have been set successfully. Defines the vcpu responses to the cpuid instruction. Applications should use the KVM_SET_CPUID2 ioctl if available. +Note, when this IOCTL fails, KVM gives no guarantees that previous valid CPUID +configuration (if there is) is not corrupted. Userspace can get a copy of the +resulting CPUID configuration through KVM_GET_CPUID2 in case. + :: struct kvm_cpuid_entry { @@ -4795,6 +4799,7 @@ hardware_exit_reason. /* KVM_EXIT_FAIL_ENTRY */ struct { __u64 hardware_entry_failure_reason; + __u32 cpu; /* if KVM_LAST_CPU */ } fail_entry; If exit_reason is KVM_EXIT_FAIL_ENTRY, the vcpu could not be run due |