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SubjectRe: [Xen-devel] [PATCH 03/24] xen/arm: page.h definitions
On Thu, 26 Jul 2012, Konrad Rzeszutek Wilk wrote:
> On Thu, Jul 26, 2012 at 04:33:45PM +0100, Stefano Stabellini wrote:
> > ARM Xen guests always use paging in hardware, like PV on HVM guests in
> > the X86 world.
>
> Nice, so no dealing with the P2M at all in the guest?

Nope ;-)


> > Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> > ---
> > arch/arm/include/asm/xen/page.h | 77 +++++++++++++++++++++++++++++++++++++++
> > 1 files changed, 77 insertions(+), 0 deletions(-)
> > create mode 100644 arch/arm/include/asm/xen/page.h
> >
> > diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
> > new file mode 100644
> > index 0000000..6cfe9a1
> > --- /dev/null
> > +++ b/arch/arm/include/asm/xen/page.h
> > @@ -0,0 +1,77 @@
> > +#ifndef _ASM_ARM_XEN_PAGE_H
> > +#define _ASM_ARM_XEN_PAGE_H
> > +
> > +#include <asm/page.h>
> > +#include <linux/pfn.h>
> > +#include <linux/types.h>
> > +#include <asm/pgtable.h>
> > +#include <xen/interface/grant_table.h>
>
> I don't if it makes such a difference, but putting the headers in sorted
> order is sometimes nicer than just randomly.. But that might be just
> me liking an orderly world nowadays :-)

I can do that


> > +
> > +#define pfn_to_mfn(pfn) (pfn)
> > +#define phys_to_machine_mapping_valid (1)
> > +#define mfn_to_pfn(mfn) (mfn)
> > +#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
> > +
> > +#define pte_mfn pte_pfn
> > +#define mfn_pte pfn_pte
> > +
> > +/* Xen machine address */
> > +typedef struct xmaddr {
> > + phys_addr_t maddr;
> > +} xmaddr_t;
> > +
> > +/* Xen pseudo-physical address */
> > +typedef struct xpaddr {
> > + phys_addr_t paddr;
> > +} xpaddr_t;
> > +
> > +#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
> > +#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
> > +
> > +static inline xmaddr_t phys_to_machine(xpaddr_t phys)
> > +{
> > + unsigned offset = phys.paddr & ~PAGE_MASK;
> > + return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
> > +}
> > +
> > +static inline xpaddr_t machine_to_phys(xmaddr_t machine)
> > +{
> > + unsigned offset = machine.maddr & ~PAGE_MASK;
> > + return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
> > +}
> > +/* VIRT <-> MACHINE conversion */
> > +#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
> > +#define virt_to_pfn(v) (PFN_DOWN(__pa(v)))
> > +#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
> > +#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
> > +
> > +static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
> > +{
> > + /* XXX: assuming it is mapped in the kernel 1:1 */
> > + return virt_to_machine(vaddr);
> > +}
> > +
> > +/* XXX: this shouldn't be here */
>
> So why is it here?

lookup_address shouldn't be here because it is an x86-only interface.
However both gntdev.c and xenbus_client.c call it (in PV only code paths
that are never taken in a PV on HVM guest), so in order to compile them
I have to define lookup_address.


> > +static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
> > +{
> > + BUG();
> > + return NULL;
> > +}
> > +
> > +static inline int m2p_add_override(unsigned long mfn, struct page *page,
> > + struct gnttab_map_grant_ref *kmap_op)
> > +{
> > + return 0;
> > +}
> > +
> > +static inline int m2p_remove_override(struct page *page, bool clear_pte)
> > +{
> > + return 0;
> > +}
> > +
> > +static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
> > +{
> > + BUG();
> > + return false;
> > +}
> > +#endif /* _ASM_ARM_XEN_PAGE_H */



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