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doc: kvm: Fix return description of KVM_SET_MSRS

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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 <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Xiaoyao Li 2019-09-05 08:57:37 +08:00 • committed by Paolo Bonzini
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
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