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    Subject[PATCH v4 20/26] kvm: arm64: Add function to enter host from KVM nVHE hyp code
    Date
    All nVHE hyp code is currently executed as handlers of host's HVCs. This
    will change as nVHE starts intercepting host's PSCI CPU_ON SMCs. The
    newly booted CPU will need to initialize EL2 state and then enter the
    host. Add __host_enter function that branches into the existing
    host state-restoring code after the trap handler would have returned.

    Signed-off-by: David Brazdil <dbrazdil@google.com>
    ---
    arch/arm64/kvm/hyp/nvhe/host.S | 9 +++++++++
    1 file changed, 9 insertions(+)

    diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S
    index 2b56f0bdf874..a820dfdc9c25 100644
    --- a/arch/arm64/kvm/hyp/nvhe/host.S
    +++ b/arch/arm64/kvm/hyp/nvhe/host.S
    @@ -39,6 +39,7 @@ SYM_FUNC_START(__host_exit)
    bl handle_trap

    /* Restore host regs x0-x17 */
    +__host_enter_restore_full:
    ldp x0, x1, [x29, #CPU_XREG_OFFSET(0)]
    ldp x2, x3, [x29, #CPU_XREG_OFFSET(2)]
    ldp x4, x5, [x29, #CPU_XREG_OFFSET(4)]
    @@ -61,6 +62,14 @@ __host_enter_without_restoring:
    sb
    SYM_FUNC_END(__host_exit)

    +/*
    + * void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
    + */
    +SYM_FUNC_START(__host_enter)
    + mov x29, x0
    + b __host_enter_restore_full
    +SYM_FUNC_END(__host_enter)
    +
    /*
    * void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
    */
    --
    2.29.2.454.gaff20da3a2-goog
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