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    SubjectRe: [PATCH v13 21/24] virt: gunyah: Add hypercalls for sending doorbell
    On 5/9/23 3:47 PM, Elliot Berman wrote:
    > Gunyah doorbells allow two virtual machines to signal each other using
    > interrupts. Add the hypercalls needed to assert the interrupt.
    >
    > Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>

    Looks good.

    Reviewed-by: Alex Elder <elder@linaro.org>

    > ---
    > arch/arm64/gunyah/gunyah_hypercall.c | 25 +++++++++++++++++++++++++
    > include/linux/gunyah.h | 3 +++
    > 2 files changed, 28 insertions(+)
    >
    > diff --git a/arch/arm64/gunyah/gunyah_hypercall.c b/arch/arm64/gunyah/gunyah_hypercall.c
    > index 5f33f53e05a9..3d48c8650851 100644
    > --- a/arch/arm64/gunyah/gunyah_hypercall.c
    > +++ b/arch/arm64/gunyah/gunyah_hypercall.c
    > @@ -33,6 +33,8 @@ EXPORT_SYMBOL_GPL(arch_is_gh_guest);
    > fn)
    >
    > #define GH_HYPERCALL_HYP_IDENTIFY GH_HYPERCALL(0x8000)
    > +#define GH_HYPERCALL_BELL_SEND GH_HYPERCALL(0x8012)
    > +#define GH_HYPERCALL_BELL_SET_MASK GH_HYPERCALL(0x8015)
    > #define GH_HYPERCALL_MSGQ_SEND GH_HYPERCALL(0x801B)
    > #define GH_HYPERCALL_MSGQ_RECV GH_HYPERCALL(0x801C)
    > #define GH_HYPERCALL_VCPU_RUN GH_HYPERCALL(0x8065)
    > @@ -55,6 +57,29 @@ void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identi
    > }
    > EXPORT_SYMBOL_GPL(gh_hypercall_hyp_identify);
    >
    > +enum gh_error gh_hypercall_bell_send(u64 capid, u64 new_flags, u64 *old_flags)
    > +{
    > + struct arm_smccc_res res;
    > +
    > + arm_smccc_1_1_hvc(GH_HYPERCALL_BELL_SEND, capid, new_flags, 0, &res);
    > +
    > + if (res.a0 == GH_ERROR_OK && old_flags)
    > + *old_flags = res.a1;
    > +
    > + return res.a0;
    > +}
    > +EXPORT_SYMBOL_GPL(gh_hypercall_bell_send);
    > +
    > +enum gh_error gh_hypercall_bell_set_mask(u64 capid, u64 enable_mask, u64 ack_mask)
    > +{
    > + struct arm_smccc_res res;
    > +
    > + arm_smccc_1_1_hvc(GH_HYPERCALL_BELL_SET_MASK, capid, enable_mask, ack_mask, 0, &res);
    > +
    > + return res.a0;
    > +}
    > +EXPORT_SYMBOL_GPL(gh_hypercall_bell_set_mask);
    > +
    > enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, void *buff, u64 tx_flags, bool *ready)
    > {
    > struct arm_smccc_res res;
    > diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
    > index cd5704a82c6a..1f1685518bf3 100644
    > --- a/include/linux/gunyah.h
    > +++ b/include/linux/gunyah.h
    > @@ -171,6 +171,9 @@ static inline u16 gh_api_version(const struct gh_hypercall_hyp_identify_resp *gh
    >
    > void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity);
    >
    > +enum gh_error gh_hypercall_bell_send(u64 capid, u64 new_flags, u64 *old_flags);
    > +enum gh_error gh_hypercall_bell_set_mask(u64 capid, u64 enable_mask, u64 ack_mask);
    > +
    > #define GH_HYPERCALL_MSGQ_TX_FLAGS_PUSH BIT(0)
    >
    > enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, void *buff, u64 tx_flags, bool *ready);

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