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SubjectRe: [PATCH v4 03/17] arm64: kvm: stop treating register x18 as caller save
Hi Sami,

On 2019-11-01 23:20, Sami Tolvanen wrote:
> From: Ard Biesheuvel <>
> In preparation of reserving x18, stop treating it as caller save in
> the KVM guest entry/exit code. Currently, the code assumes there is
> no need to preserve it for the host, given that it would have been
> assumed clobbered anyway by the function call to __guest_enter().
> Instead, preserve its value and restore it upon return.
> Link:
> Signed-off-by: Ard Biesheuvel <>
> [Sami: updated commit message, switched from x18 to x29 for the guest
> context]
> Signed-off-by: Sami Tolvanen <>
> Reviewed-by: Kees Cook <>

If you intend for this to be merged via the arm64 tree, please add my

Reviewed-by: Marc Zyngier <>


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