Re: [PATCH v7 10/10] Drivers: hv: Enable Hyper-V code to be built on ARM64

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On 24/08/2020 18:24, Ard Biesheuvel wrote:
On Mon, 24 Aug 2020 at 18:48, Michael Kelley <mikelley@xxxxxxxxxxxxx> wrote:

Update drivers/hv/Kconfig so CONFIG_HYPERV can be selected on
ARM64, causing the Hyper-V specific code to be built.

Signed-off-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
---
  drivers/hv/Kconfig | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 79e5356..1113e49 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -4,7 +4,8 @@ menu "Microsoft Hyper-V guest support"

  config HYPERV
         tristate "Microsoft Hyper-V client drivers"
-       depends on X86 && ACPI && X86_LOCAL_APIC && HYPERVISOR_GUEST
+       depends on ACPI && \
+                       ((X86 && X86_LOCAL_APIC && HYPERVISOR_GUEST) || ARM64)
         select PARAVIRT
         select X86_HV_CALLBACK_VECTOR
         help

Given the comment in a previous patch

+/*
+ * All data structures defined in the TLFS that are shared between Hyper-V
+ * and a guest VM use Little Endian byte ordering.  This matches the default
+ * byte ordering of Linux running on ARM64, so no special handling is required.
+ */

shouldn't this depend on !CONFIG_CPU_BIG_ENDIAN ?

or mark the data __le and have the appropriate accessor functions do
the swapping.


--
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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