On Thu, 7 May 2026 at 21:22, Ackerley Tng via B4 Relay <[email protected]> wrote: > > From: Sean Christopherson <[email protected]> > > Bury KVM_VM_MEMORY_ATTRIBUTES in x86 to discourage other architectures > from adding support for per-VM memory attributes, because tracking private > vs. shared memory on a per-VM basis is now deprecated in favor of tracking > on a per-guest_memfd basis, and no other memory attributes are on the > horizon. > > This will also allow modifying KVM_VM_MEMORY_ATTRIBUTES to be > user-selectable (in x86) without creating weirdness in KVM's Kconfigs. > Now that guest_memfd support memory attributes, it's entirely possible to > run x86 CoCo VMs without support for KVM_VM_MEMORY_ATTRIBUTES. > > Leave the code itself in common KVM so that it's trivial to undo this > change if new per-VM attributes do come along. > > Signed-off-by: Sean Christopherson <[email protected]> > Signed-off-by: Ackerley Tng <[email protected]>
Reviewed-by: Fuad Tabba <[email protected]> Cheers, /fuad > --- > arch/x86/kvm/Kconfig | 4 ++++ > virt/kvm/Kconfig | 4 ---- > 2 files changed, 4 insertions(+), 4 deletions(-) > > diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig > index 26f6afd51bbdc..b6d65ee664d0f 100644 > --- a/arch/x86/kvm/Kconfig > +++ b/arch/x86/kvm/Kconfig > @@ -80,6 +80,10 @@ config KVM_WERROR > > If in doubt, say "N". > > +config KVM_VM_MEMORY_ATTRIBUTES > + select KVM_MEMORY_ATTRIBUTES > + bool > + > config KVM_SW_PROTECTED_VM > bool "Enable support for KVM software-protected VMs" > depends on EXPERT > diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig > index e371e079e2c50..663de6421eda2 100644 > --- a/virt/kvm/Kconfig > +++ b/virt/kvm/Kconfig > @@ -103,10 +103,6 @@ config KVM_MMU_LOCKLESS_AGING > config KVM_MEMORY_ATTRIBUTES > bool > > -config KVM_VM_MEMORY_ATTRIBUTES > - select KVM_MEMORY_ATTRIBUTES > - bool > - > config KVM_GUEST_MEMFD > select XARRAY_MULTI > select KVM_MEMORY_ATTRIBUTES > > -- > 2.54.0.563.g4f69b47b94-goog > >
