Messages in this thread | | | Date | Thu, 28 Sep 2017 22:32:19 +0200 | From | Borislav Petkov <> | Subject | Re: [Part1 PATCH v5 15/17] percpu: Introduce DEFINE_PER_CPU_DECRYPTED |
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On Wed, Sep 27, 2017 at 10:13:27AM -0500, Brijesh Singh wrote: > KVM guest defines three per-CPU variables (steal-time, apf_reason, and > avic_eio) which are shared between a guest and a hypervisor. When SEV > is active, memory is encrypted with a guest-specific key, and if the > guest OS wants to share the memory region with the hypervisor then it > must clear the C-bit (i.e set decrypted) before sharing it. > > DEFINE_PER_CPU_DECRYPTED can be used to define the per-CPU variables > which will be shared between a guest and a 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> > --- > include/asm-generic/vmlinux.lds.h | 19 +++++++++++++++++++ > include/linux/percpu-defs.h | 15 +++++++++++++++ > 2 files changed, 34 insertions(+)
Reviewed-by: Borislav Petkov <bp@suse.de>
-- Regards/Gruss, Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
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