linux

iv/linux

History

Linus Torvalds 137e0ec05a KVM GUEST_MEMFD fixes for 6.8:

- Make KVM_MEM_GUEST_MEMFD mutually exclusive with KVM_MEM_READONLY to
   avoid creating an inconsistent ABI (KVM_MEM_GUEST_MEMFD is not writable
   from userspace, so there would be no way to write to a read-only
   guest_memfd).
 
 - Update documentation for KVM_SW_PROTECTED_VM to make it abundantly
   clear that such VMs are purely for development and testing.
 
 - Limit KVM_SW_PROTECTED_VM guests to the TDP MMU, as the long term plan
   is to support confidential VMs with deterministic private memory (SNP
   and TDX) only in the TDP MMU.
 
 - Fix a bug in a GUEST_MEMFD dirty logging test that caused false passes.
 
 x86 fixes:
 
 - Fix missing marking of a guest page as dirty when emulating an atomic access.
 
 - Check for mmu_notifier invalidation events before faulting in the pfn,
   and before acquiring mmu_lock, to avoid unnecessary work and lock
   contention with preemptible kernels (including CONFIG_PREEMPT_DYNAMIC
   in non-preemptible mode).
 
 - Disable AMD DebugSwap by default, it breaks VMSA signing and will be
   re-enabled with a better VM creation API in 6.10.
 
 - Do the cache flush of converted pages in svm_register_enc_region() before
   dropping kvm->lock, to avoid a race with unregistering of the same region
   and the consequent use-after-free issue.
 -----BEGIN PGP SIGNATURE-----
 
 iQFIBAABCAAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmXskdYUHHBib256aW5p
 QHJlZGhhdC5jb20ACgkQv/vSX3jHroN1TAf/SUGf4QuYG7nnfgWDR+goFO6Gx7NE
 pJr3kAwv6d2f+qTlURfGjnX929pgZDLgoTkXTNeZquN6LjgownxMjBIpymVobvAD
 AKvqJS/ECpryuehXbeqlxJxJn+TrxJ5r4QeNILMHc3AOZoiUqM6xl3zFfXWDNWVo
 IazwT8P3d8wxiHAxv1eG6OVWHxbcg31068FVKRX3f/bWPbVwROJrPkCopmz2BJvU
 6KYdYcn2rkpDTEM3ouDC/6gxJ9vpSY3+nW7Q7dNtGtOH2+BddfSA6I0rphCQWCNs
 uXOxd5bDrC+KmkiULTPostuvwBgIm1k9wC2kW9A4P2VEf6Ay+ZHEdAOBJQ==
 =+MT/
 -----END PGP SIGNATURE-----

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "KVM GUEST_MEMFD fixes for 6.8:

   - Make KVM_MEM_GUEST_MEMFD mutually exclusive with KVM_MEM_READONLY
     to avoid creating an inconsistent ABI (KVM_MEM_GUEST_MEMFD is not
     writable from userspace, so there would be no way to write to a
     read-only guest_memfd).

   - Update documentation for KVM_SW_PROTECTED_VM to make it abundantly
     clear that such VMs are purely for development and testing.

   - Limit KVM_SW_PROTECTED_VM guests to the TDP MMU, as the long term
     plan is to support confidential VMs with deterministic private
     memory (SNP and TDX) only in the TDP MMU.

   - Fix a bug in a GUEST_MEMFD dirty logging test that caused false
     passes.

  x86 fixes:

   - Fix missing marking of a guest page as dirty when emulating an
     atomic access.

   - Check for mmu_notifier invalidation events before faulting in the
     pfn, and before acquiring mmu_lock, to avoid unnecessary work and
     lock contention with preemptible kernels (including
     CONFIG_PREEMPT_DYNAMIC in non-preemptible mode).

   - Disable AMD DebugSwap by default, it breaks VMSA signing and will
     be re-enabled with a better VM creation API in 6.10.

   - Do the cache flush of converted pages in svm_register_enc_region()
     before dropping kvm->lock, to avoid a race with unregistering of
     the same region and the consequent use-after-free issue"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  SEV: disable SEV-ES DebugSwap by default
  KVM: x86/mmu: Retry fault before acquiring mmu_lock if mapping is changing
  KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()
  KVM: selftests: Add a testcase to verify GUEST_MEMFD and READONLY are exclusive
  KVM: selftests: Create GUEST_MEMFD for relevant invalid flags testcases
  KVM: x86/mmu: Restrict KVM_SW_PROTECTED_VM to the TDP MMU
  KVM: x86: Update KVM_SW_PROTECTED_VM docs to make it clear they're a WIP
  KVM: Make KVM_MEM_GUEST_MEMFD mutually exclusive with KVM_MEM_READONLY
  KVM: x86: Mark target gfn of emulated atomic instruction as dirty

2024-03-10 09:27:39 -07:00

boot

x86/efistub: Use 1:1 file:memory mapping for PE/COFF .compat section

2024-02-05 10:24:51 +00:00

coco

- Add support managing TDX host hardware

2024-01-18 13:41:48 -08:00

configs

hardening updates for v6.7-rc1

2023-10-30 19:09:55 -10:00

crypto

This update includes the following changes: