On 05/09/19 02:57, Xiaoyao Li wrote: > 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@xxxxxxxxx> Queued, thanks. Paolo > --- > v3: > refine the description based on Sean's comment. > > v2: > elaborate the changelog and description of ioctl KVM_SET_MSRS based on > Sean's comments. > --- > Documentation/virt/kvm/api.txt | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/Documentation/virt/kvm/api.txt b/Documentation/virt/kvm/api.txt > index 2d067767b617..24541e52e96e 100644 > --- a/Documentation/virt/kvm/api.txt > +++ b/Documentation/virt/kvm/api.txt > @@ -586,7 +586,7 @@ Capability: basic > Architectures: x86 > Type: vcpu ioctl > 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 > 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 > 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 > >
