RE: [PATCH v8 1/6] arm64: hyperv: Add Hyper-V hypercall and register access utilities

From
Michael Kelley <hidden>
Date
2021-03-05 20:57:10
Also in
linux-efi, linux-hyperv, lkml
Reply to
Sunil Muthuswamy, 2021-03-03
From: Sunil Muthuswamy <redacted> Sent: Tuesday, March 2, 2021 4:35 PM
quoted
+}
+EXPORT_SYMBOL_GPL(hv_do_fast_hypercall8);
+
+
nit: Extra line, here and few other places
I'll try to clean these up.
quoted
+u64 hv_get_vpreg(u32 msr)
+{
+	struct hv_get_vp_registers_input	*input;
+	struct hv_get_vp_registers_output	*output;
+	u64					result;
It seems like the code is using both spaces and tabs to align variable names. Can
we stick to one or the other, preferably spaces.
I think the general preference is to use tabs for alignment, not
spaces, so I'll try to clean these up in the next version.
quoted
+
+	/*
+	 * Allocate a power of 2 size so alignment to that size is
+	 * guaranteed, since the hypercall input and output areas
+	 * must not cross a page boundary.
+	 */
+	input = kzalloc(roundup_pow_of_two(sizeof(input->header) +
+				sizeof(input->element[0])), GFP_ATOMIC);
+	output = kmalloc(roundup_pow_of_two(sizeof(*output)), GFP_ATOMIC);
+
Check for null from these malloc routines? Here and in other places.
See my comment back to Boqun Feng on the same point.
quoted
+	__hv_get_vpreg_128(msr, input, output);
+ * Linux-specific definitions for managing interactions with Microsoft's
+ * Hyper-V hypervisor. The definitions in this file are specific to
+ * the ARM64 architecture.  See include/asm-generic/mshyperv.h for
nit: Two space before 'See'. Here and in couple of other places.
The debate rages in the broader world of writing about using one
space vs. two spaces. :-)   I'm still old school on this point, and use two
spaces out of decades of habit, particularly with monospaced fonts,
though I'm probably not 100% consistent.

Michael


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Thread (4 messages) 4 messages, 2 authors, last reply 2021-03-05
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