[RFC 06/11] hv: hyperv.h: Introduce some hvpfn helper functions
From: Boqun Feng <hidden>
Date: 2020-07-21 01:42:44
Also in:
linux-input, linux-scsi, lkml, netdev
Subsystem:
hyper-v/azure core and drivers, the rest · Maintainers:
"K. Y. Srinivasan", Haiyang Zhang, Wei Liu, Dexuan Cui, Long Li, Linus Torvalds
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 <redacted> --- include/linux/hyperv.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index eda8e5f9a49d..b34d94b1f659 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h@@ -1703,4 +1703,8 @@ static inline unsigned long virt_to_hvpfn(void *addr) return paddr >> HV_HYP_PAGE_SHIFT; } +#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) << PAGE_SHIFT) >> HV_HYP_PAGE_SHIFT) + #endif /* _HYPERV_H */
--
2.27.0