From 106dee08408118c5b50387817e74419436e8b651 Mon Sep 17 00:00:00 2001 From: Boqun Feng Date: Wed, 16 Sep 2020 11:48:12 +0800 Subject: [PATCH] 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 Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20200916034817.30282-7-boqun.feng@gmail.com Signed-off-by: Wei Liu --- include/linux/hyperv.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 83456dc181a8..1ce131f29f3b 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -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 */ -- 2.17.1