Commit 106dee08 authored Sep 16, 2020 by Boqun Feng Committed by Wei Liu Sep 28, 2020

hv: hyperv.h: Introduce some hvpfn helper functions



When a guest communicate with the hypervisor, it must use HV_HYP_PAGE to
calculate PFN, so introduce a few hvpfn helper functions as the
counterpart of the page helper functions. This is the preparation for
supporting guest whose PAGE_SIZE is not 4k.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20200916034817.30282-7-boqun.feng@gmail.com


Signed-off-by: Wei Liu <wei.liu@kernel.org>

parent bca6b91d

include/linux/hyperv.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -1691,4 +1691,9 @@ static inline unsigned long virt_to_hvpfn(void *addr)
		return paddr >> HV_HYP_PAGE_SHIFT;
		}

		#define NR_HV_HYP_PAGES_IN_PAGE (PAGE_SIZE / HV_HYP_PAGE_SIZE)
		#define offset_in_hvpage(ptr) ((unsigned long)(ptr) & ~HV_HYP_PAGE_MASK)
		#define HVPFN_UP(x) (((x) + HV_HYP_PAGE_SIZE-1) >> HV_HYP_PAGE_SHIFT)
		#define page_to_hvpfn(page) (page_to_pfn(page) * NR_HV_HYP_PAGES_IN_PAGE)

		#endif /* _HYPERV_H */

Admin message