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doc: kvm: Fix return description of KVM_SET_MSRS 

Userspace can use ioctl KVM_SET_MSRS to update a set of MSRs of guest.
This ioctl set specified MSRs one by one. If it fails to set an MSR,
e.g., due to setting reserved bits, the MSR is not supported/emulated by
KVM, etc..., it stops processing the MSR list and returns the number of
MSRs have been set successfully.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2019-09-05 08:57:37 +08:00 committed by Paolo Bonzini
parent 4f75bcc332
commit b274a29081
1 changed files with 6 additions and 1 deletions
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7
Documentation/virt/kvm/api.txt
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@ -586,7 +586,7 @@ Capability: basic
Architectures: x86 Architectures: x86
Type: vcpu ioctl Type: vcpu ioctl
Parameters: struct kvm_msrs (in) Parameters: struct kvm_msrs (in)
Returns: 0 on success, -1 on error Returns: number of msrs successfully set (see below), -1 on error
Writes model-specific registers to the vcpu. See KVM_GET_MSRS for the Writes model-specific registers to the vcpu. See KVM_GET_MSRS for the
data structures. data structures.
@ -595,6 +595,11 @@ Application code should set the 'nmsrs' member (which indicates the
size of the entries array), and the 'index' and 'data' members of each size of the entries array), and the 'index' and 'data' members of each
array entry. array entry.
It tries to set the MSRs in array entries[] one by one. If setting an MSR
fails, e.g., due to setting reserved bits, the MSR isn't supported/emulated
by KVM, etc..., it stops processing the MSR list and returns the number of
MSRs that have been set successfully.
4.20 KVM_SET_CPUID 4.20 KVM_SET_CPUID