From ca48739e59df31d16c27dbcd9ea2ea61d7caa9fb Mon Sep 17 00:00:00 2001 From: Michael Kelley Date: Tue, 2 Mar 2021 13:38:13 -0800 Subject: Drivers: hv: vmbus: Move Hyper-V page allocator to arch neutral code The Hyper-V page allocator functions are implemented in an architecture neutral way. Move them into the architecture neutral VMbus module so a separate implementation for ARM64 is not needed. No functional change. Signed-off-by: Michael Kelley Reviewed-by: Boqun Feng Link: https://lore.kernel.org/r/1614721102-2241-2-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu --- drivers/hv/hv.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'drivers/hv') diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index f202ac7f4b3d..cca8d5ea61f0 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -36,6 +36,42 @@ int hv_init(void) return 0; } +/* + * Functions for allocating and freeing memory with size and + * alignment HV_HYP_PAGE_SIZE. These functions are needed because + * the guest page size may not be the same as the Hyper-V page + * size. We depend upon kmalloc() aligning power-of-two size + * allocations to the allocation size boundary, so that the + * allocated memory appears to Hyper-V as a page of the size + * it expects. + */ + +void *hv_alloc_hyperv_page(void) +{ + BUILD_BUG_ON(PAGE_SIZE < HV_HYP_PAGE_SIZE); + + if (PAGE_SIZE == HV_HYP_PAGE_SIZE) + return (void *)__get_free_page(GFP_KERNEL); + else + return kmalloc(HV_HYP_PAGE_SIZE, GFP_KERNEL); +} + +void *hv_alloc_hyperv_zeroed_page(void) +{ + if (PAGE_SIZE == HV_HYP_PAGE_SIZE) + return (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); + else + return kzalloc(HV_HYP_PAGE_SIZE, GFP_KERNEL); +} + +void hv_free_hyperv_page(unsigned long addr) +{ + if (PAGE_SIZE == HV_HYP_PAGE_SIZE) + free_page(addr); + else + kfree((void *)addr); +} + /* * hv_post_message - Post a message using the hypervisor message IPC. * -- cgit v1.2.3