On 4/28/2025 8:42 AM, Edgecombe, Rick P wrote:
Right, so there should be no need to keep a separate features and buffer size
for KVM's xsave UABI, as this patch does. Let's just leave it using the core
kernels UABI version.
Hmm, why so?
As I see it, the vcpu->arch.guest_fpu structure is already exposed to
KVM. This series doesn’t modify those structures (fpu_guest and
fpstate), other than removing a dead field (patch 2).
Both ->usersize and ->user_xfeatures fields are already exposed --
currently KVM just doesn’t reference them at all.
All the changes introduced here are transparent to KVM. Organizing the
initial values and wiring up guest_perm and fpstate are entirely
internal to the x86 core, no?
