Messages in this thread | | | Date | Mon, 18 Sep 2017 20:13:44 -0700 | From | Tejun Heo <> | Subject | Re: [Part1 PATCH v4 15/17] percpu: introduce DEFINE_PER_CPU_UNENCRYPTED |
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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@linutronix.de> > Cc: Ingo Molnar <mingo@redhat.com> > Cc: "H. Peter Anvin" <hpa@zytor.com> > Cc: Borislav Petkov <bp@suse.de> > Cc: Arnd Bergmann <arnd@arndb.de> > Cc: Tejun Heo <tj@kernel.org> > Cc: Christoph Lameter <cl@linux.com> > Cc: linux-arch@vger.kernel.org > Cc: x86@kernel.org > Cc: linux-kernel@vger.kernel.org > Cc: Tom Lendacky <thomas.lendacky@amd.com> > Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
-- tejun
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