Fix a bug where a misbehaving (or niave?) userspace can configure guest CPUID
such that KVM will use the "wrong" root level for its mirror EPTs and trip the
KVM_BUG_ON() in tdx_load_mmu_pgd().
v3:
- Use kvm_mmu_get_max_tdp_level() in __kvm_mmu_create() to avoid what is
effectively a false positive WARN. [Sashiko]
v2:
- https://lore.kernel.org/all/20260826215258.937210-1-seanjc@google.com
- Rewrite the comment in kvm_mmu_get_tdp_level(). [Rick]
- Check for kvm_has_mirrored_tdp() in kvm_mmu_get_tdp_level(), and yell if
arch.mirror_root_level isn't also set. [Rick]
- Separate the removal of TDX_SHARED_BIT_PWL_{4,5} from the bug fix. [Rick]
- Fix a buring => buried typo. [Binbin]
- Collect Tested/Reviewed-by. [Binbin, Rick, Yan] (I applied 'em only to
patch 1, please holler if that doesn't seem right).
v1: https://lore.kernel.org/all/20260814224509.2342760-1-seanjc@google.com
Sean Christopherson (3):
KVM: x86/mmu: Use KVM's max TDP level to determine need for 32-bit TDP
root
KVM: VMX: Explicitly track TDX VMs' root level instead of guessing it
from CPUID
KVM: VMX: Drop TDX_SHARED_BIT_PWL_{4,5} and dedup related code
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/cpuid.c | 14 --------------
arch/x86/kvm/cpuid.h | 1 -
arch/x86/kvm/mmu/mmu.c | 21 ++++++++++++---------
arch/x86/kvm/vmx/tdx.c | 20 +++++++++++---------
5 files changed, 24 insertions(+), 33 deletions(-)
base-commit: 76671054f9a1ff6abb976583cd8da37650acdc97
--
2.55.0.970.g62bdec98f9-goog