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authorMichael Kelley <mikelley@microsoft.com>2021-03-02 13:38:13 -0800
committerWei Liu <wei.liu@kernel.org>2021-03-08 17:32:59 +0000
commitca48739e59df31d16c27dbcd9ea2ea61d7caa9fb (patch)
tree3212f550f5f24e46a62d79324606b926a62635db /drivers/hv
parentf850a4cad27c3cfeb89fd28c768d5e6821bf178f (diff)
downloadlinux-ca48739e59df31d16c27dbcd9ea2ea61d7caa9fb.tar.bz2
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 <mikelley@microsoft.com> Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Link: https://lore.kernel.org/r/1614721102-2241-2-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/hv.c36
1 files changed, 36 insertions, 0 deletions
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
@@ -37,6 +37,42 @@ int hv_init(void)
}
/*
+ * 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.
*
* This involves a hypercall.