On Tue, Mar 31, 2020 at 08:53:07PM -0300, Thiago Jung Bauermann wrote:
>
> Hi Ram,
>
> Ram Pai <linux...@us.ibm.com> writes:
>
> > diff --git a/arch/powerpc/sysdev/xive/spapr.c
> > b/arch/powerpc/sysdev/xive/spapr.c
> > index 55dc61c..608b52f 100644
> > --- a/arch/powerpc/sysdev/xive/spapr.c
> > +++ b/arch/powerpc/sysdev/xive/spapr.c
> > @@ -26,6 +26,8 @@
> > #include <asm/xive.h>
> > #include <asm/xive-regs.h>
> > #include <asm/hvcall.h>
> > +#include <asm/svm.h>
> > +#include <asm/ultravisor.h>
> >
> > #include "xive-internal.h"
> >
> > @@ -501,6 +503,9 @@ static int xive_spapr_configure_queue(u32 target,
> > struct xive_q *q, u8 prio,
> > rc = -EIO;
> > } else {
> > q->qpage = qpage;
> > + if (is_secure_guest())
> > + uv_share_page(PHYS_PFN(qpage_phys),
> > + 1 << xive_alloc_order(order));
>
> If I understand this correctly, you're passing the number of bytes of
> the queue to uv_share_page(), but that ultracall expects the number of
> pages to be shared.
static inline u32 xive_alloc_order(u32 queue_shift)
{
return (queue_shift > PAGE_SHIFT) ? (queue_shift - PAGE_SHIFT) : 0;
}
xive_alloc_order(order) returns the order of PAGE_SIZE pages.
Hence the value passed to uv_shared_pages is the number of pages,
and not the number of bytes.
BTW: I did verify through testing that it was indeed passing 1 page to the
uv_share_page().
RP
