[RFC,06/11] hv: hyperv.h: Introduce some hvpfn helper functions
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Message ID 20200721014135.84140-7-boqun.feng@gmail.com
State Superseded
Headers show
  • Hyper-V: Support PAGE_SIZE larger than 4K
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Commit Message

Boqun Feng July 21, 2020, 1:41 a.m. UTC
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>
 include/linux/hyperv.h | 4 ++++
 1 file changed, 4 insertions(+)

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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 */