x86/hyper-v: Mark TLFS structures packed

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The TLFS structures are used for hypervisor-guest communication and must
exactly meet the specification.

Compilers can add alignment padding to structures or reorder struct members
for randomization and optimization, which would break the hypervisor ABI.

Mark the structures as packed to prevent this. 'struct hv_vp_assist_page'
and 'struct hv_enlightened_vmcs' need to be properly padded to support the
change.

Suggested-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Nadav Amit <nadav.amit@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

This commit is contained in:

Vitaly Kuznetsov 2018-12-12 18:57:01 +01:00 • committed by Paolo Bonzini

parent 7deec5e0df

commit ec08449172

1 changed files with 25 additions and 22 deletions

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arch/x86/include/asm/hyperv-tlfs.h

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