On 2/23/2023 4:15 PM, Alex Elder wrote:
On 2/14/23 3:23 PM, Elliot Berman wrote:
Add hypercalls to send and receive messages on a Gunyah message queue.
Signed-off-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
---
arch/arm64/gunyah/gunyah_hypercall.c | 32 ++++++++++++++++++++++++++++
include/linux/gunyah.h | 7 ++++++
2 files changed, 39 insertions(+)
diff --git a/arch/arm64/gunyah/gunyah_hypercall.c
b/arch/arm64/gunyah/gunyah_hypercall.c
index f30d06ee80cf..2ca9ab098ff6 100644
--- a/arch/arm64/gunyah/gunyah_hypercall.c
+++ b/arch/arm64/gunyah/gunyah_hypercall.c
@@ -38,6 +38,8 @@ EXPORT_SYMBOL_GPL(arch_is_gunyah_guest);
fn)
#define GH_HYPERCALL_HYP_IDENTIFY GH_HYPERCALL(0x8000)
+#define GH_HYPERCALL_MSGQ_SEND GH_HYPERCALL(0x801B)
+#define GH_HYPERCALL_MSGQ_RECV GH_HYPERCALL(0x801C)
/**
* gh_hypercall_hyp_identify() - Returns build information and
feature flags
@@ -57,5 +59,35 @@ 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_msgq_send(u64 capid, size_t size,
uintptr_t buff, int tx_flags,
+ bool *ready)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_SEND, capid, size, buff,
tx_flags, 0, &res);
+
+ if (res.a0 == GH_ERROR_OK)
+ *ready = res.a1;
+
+ return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_msgq_send);
+
+enum gh_error gh_hypercall_msgq_recv(u64 capid, uintptr_t buff,
size_t size, size_t *recv_size,
+ bool *ready)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_RECV, capid, buff, size, 0,
&res);
+
+ if (res.a0 == GH_ERROR_OK) {
+ *recv_size = res.a1;
Is there any chance the 64-bit size is incompatible
with size_t? (Too big?)
This is safe because size of messages <= 240.
+ *ready = res.a2;
*ready = !!res.a2;
+ }
+
+ return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_msgq_recv);
+
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Gunyah Hypervisor Hypercalls");
diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
index 3fef2854c5e1..cb6df4eec5c2 100644
--- a/include/linux/gunyah.h
+++ b/include/linux/gunyah.h
@@ -112,4 +112,11 @@ struct gh_hypercall_hyp_identify_resp {
void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp
*hyp_identity);
+#define GH_HYPERCALL_MSGQ_TX_FLAGS_PUSH BIT(0)
+
+enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size,
uintptr_t buff, int tx_flags,
+ bool *ready);
Why uintptr_t? Why not just pass a host pointer (void *)
and do whatever conversion is necessary inside the function?
-Alex
+enum gh_error gh_hypercall_msgq_recv(u64 capid, uintptr_t buff,
size_t size, size_t *recv_size,
+ bool *ready);
+
#endif
