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| author | Boqun Feng <boqun.feng@gmail.com> | 2020-09-16 11:48:12 +0800 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2020-09-28 08:55:13 +0000 |
| commit | 106dee08408118c5b50387817e74419436e8b651 (patch) | |
| tree | 8582a63e1fd0344afdffe56b86a2ff9eddd85bbc /include/linux/hyperv.h | |
| parent | bca6b91dfdd4347d8fe0bb97377dda0cacd51d82 (diff) | |
| download | lwn-106dee08408118c5b50387817e74419436e8b651.tar.gz lwn-106dee08408118c5b50387817e74419436e8b651.zip | |
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>
Diffstat (limited to 'include/linux/hyperv.h')
| -rw-r--r-- | include/linux/hyperv.h | 5 |
1 files changed, 5 insertions, 0 deletions
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 */ |