Re: [kvm PATCH v6 0/2] shrink vcpu_vmx down to order 2

On Mon, May 24, 2021, Jim Mattson wrote:

On Mon, May 24, 2021 at 3:44 PM Sean Christopherson [off-list ref] wrote:

quoted

On Mon, May 24, 2021, Paolo Bonzini wrote:

quoted

On 21/05/21 22:58, Jim Mattson wrote:

quoted

On Wed, Oct 31, 2018 at 4:49 PM Marc Orr [off-list ref] wrote:

quoted

Compared to the last version, I've:
(1) dropped the vmalloc patches
(2) updated the kmem cache for the guest_fpu field in the kvm_vcpu_arch
     struct to be sized according to fpu_kernel_xstate_size
(3) Added minimum FPU checks in KVM's x86 init logic to avoid memory
     corruption issues.

Marc Orr (2):
   kvm: x86: Use task structs fpu field for user
   kvm: x86: Dynamically allocate guest_fpu

  arch/x86/include/asm/kvm_host.h | 10 +++---
  arch/x86/kvm/svm.c              | 10 ++++++
  arch/x86/kvm/vmx.c              | 10 ++++++
  arch/x86/kvm/x86.c              | 55 ++++++++++++++++++++++++---------
  4 files changed, 65 insertions(+), 20 deletions(-)

--

Whatever happened to this series?

There was a question about the usage of kmem_cache_create_usercopy, and a v7
was never sent.

What's that go to do with anything? :-D

  b666a4b69739 ("kvm: x86: Dynamically allocate guest_fpu")
  240c35a3783a ("kvm: x86: Use task structs fpu field for user")

So, that's what the series was trimmed down to. Thanks!

Did we still manage to get down to order 2?

Yep, almost made it to order-1!

Current size (without 8 bytes from CONFIG_HYPERV=y) is 9728.