Re: [Part1 PATCH v4 15/17] percpu: introduce DEFINE_PER_CPU_UNENCRYPTED

[Tejun Heo]

On Sat, Sep 16, 2017 at 07:34:16AM -0500, Brijesh Singh wrote:
> When SEV is active, memory is encrypted with guest-specific key, and if
> guest OS wants to share the memory region with hypervisor then it must
> clear the C-bit (i.e set unencrypted) before sharing it.
> 
> DEFINE_PER_CPU_UNENCRYPTED can be used to define the per-cpu variables
> which will be shared between guest and hypervisor. Currently, KVM defines
> three variables (steal-time, apf_reason, and avic_eio) which are shared
> with hypervisor.
> 
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxx>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: Tejun Heo <tj@xxxxxxxxxx>
> Cc: Christoph Lameter <cl@xxxxxxxxx>
> Cc: linux-arch@xxxxxxxxxxxxxxx
> Cc: x86@xxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
> Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>

Acked-by: Tejun Heo <tj@xxxxxxxxxx>

Thanks.

-- 
tejun