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KVM x86 fixes for 6.16-rcN

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- Reject SEV{-ES} intra-host migration if one or more vCPUs are actively
    being created so as not to create a non-SEV{-ES} vCPU in an SEV{-ES} VM.
 
  - Use a pre-allocated, per-vCPU buffer for handling de-sparsified vCPU masks
    when emulating Hyper-V hypercalls to fix a "stack frame too large" issue.
 
  - Allow out-of-range/invalid Xen event channel ports when configuring IRQ
    routing to avoid dictating a specific ioctl() ordering to userspace.
 
  - Conditionally reschedule when setting memory attributes to avoid soft
    lockups when userspace converts huge swaths of memory to/from private.
 
  - Add back MWAIT as a required feature for the MONITOR/MWAIT selftest.
 
  - Add a missing field in struct sev_data_snp_launch_start that resulted in
    the guest-visible workarounds field being filled at the wrong offset.
 
  - Skip non-canonical address when processing Hyper-V PV TLB flushes to avoid
    VM-Fail on INVVPID.
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Merge tag 'kvm-x86-fixes-6.16-rcN' of https://github.com/kvm-x86/linux into HEAD

KVM x86 fixes for 6.16-rcN

- Reject SEV{-ES} intra-host migration if one or more vCPUs are actively
  being created so as not to create a non-SEV{-ES} vCPU in an SEV{-ES} VM.

- Use a pre-allocated, per-vCPU buffer for handling de-sparsified vCPU masks
  when emulating Hyper-V hypercalls to fix a "stack frame too large" issue.

- Allow out-of-range/invalid Xen event channel ports when configuring IRQ
  routing to avoid dictating a specific ioctl() ordering to userspace.

- Conditionally reschedule when setting memory attributes to avoid soft
  lockups when userspace converts huge swaths of memory to/from private.

- Add back MWAIT as a required feature for the MONITOR/MWAIT selftest.

- Add a missing field in struct sev_data_snp_launch_start that resulted in
  the guest-visible workarounds field being filled at the wrong offset.

- Skip non-canonical address when processing Hyper-V PV TLB flushes to avoid
  VM-Fail on INVVPID.

- Advertise supported TDX TDVMCALLs to userspace.
This commit is contained in:
Paolo Bonzini 2025-07-08 10:49:19 -04:00
commit 5383fc057a
13 changed files with 117 additions and 23 deletions
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