On 1/28/2023 5:43 AM, Sean Christopherson wrote:
On Thu, Nov 24, 2022, Yang Weijiang wrote:Arch LBR MSR_ARCH_LBR_DEPTH and MSR_ARCH_LBR_CTL are queried by userspace application before it wants to {save|restore} the Arch LBR data. Other LBR related data MSRs are omitted here intentionally due to lengthy list(32*3). Userspace can still use KVM_{GET|SET}_MSRS to access them if necessary.Absolutely not. "there are a lot of them" isn't sufficient justification. If the MSRs need to be migrated, then KVM needs to report them. If the expectation is that XSAVES will handle them, then KVM needs to take a dependency on XSAVES when enabling arch LBRs.
OK, will add the full MSR list.
