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 <[email protected]> > Cc: Ingo Molnar <[email protected]> > Cc: "H. Peter Anvin" <[email protected]> > Cc: Borislav Petkov <[email protected]> > Cc: Arnd Bergmann <[email protected]> > Cc: Tejun Heo <[email protected]> > Cc: Christoph Lameter <[email protected]> > Cc: [email protected] > Cc: [email protected] > Cc: [email protected] > Cc: Tom Lendacky <[email protected]> > Signed-off-by: Brijesh Singh <[email protected]> > Acked-by: Tejun Heo <[email protected]> > --- > include/asm-generic/vmlinux.lds.h | 19 +++++++++++++++++++ > include/linux/percpu-defs.h | 15 +++++++++++++++ > 2 files changed, 34 insertions(+)
Reviewed-by: Borislav Petkov <[email protected]> -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
