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d514aa4e70
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. Bug: 145210207 Change-Id: I12ef981133176a5092b091a060c8d2493cb6f0c3 (am from https://lore.kernel.org/patchwork/patch/1149065/) Link: https://patchwork.kernel.org/patch/9836891/ Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Mark Rutland <mark.rutland@arm.com> [Sami: updated commit message, switched from x18 to x29 for the guest context] Signed-off-by: Sami Tolvanen <samitolvanen@google.com>