[PATCH v9 2/7] KVM: arm64: Support FFA_NOTIFICATION_BIND in host handler
From: Sebastian Ene <hidden>
Date: 2026-09-07 17:19:41
Also in:
kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Verify the arguments of the FF-A notification bind call and forward the message to Trustzone. Reviewed-by: Vincent Donnefort <redacted> Signed-off-by: Sebastian Ene <redacted> --- arch/arm64/kvm/hyp/nvhe/ffa.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c
index aa82c58380a8..89872e12f9d4 100644
--- a/arch/arm64/kvm/hyp/nvhe/ffa.c
+++ b/arch/arm64/kvm/hyp/nvhe/ffa.c@@ -42,6 +42,8 @@ */ #define HOST_FFA_ID 0 +#define FFA_NOTIF_RECEIVER_ENDP_MASK GENMASK(15, 0) + /* * A buffer to hold the maximum descriptor size we can see from the host, * which is required when the SPMD returns a fragmented FFA_MEM_RETRIEVE_RESP
@@ -692,7 +694,6 @@ static bool ffa_call_supported(u64 func_id) case FFA_MEM_DONATE: case FFA_MEM_RETRIEVE_REQ: /* Optional notification interfaces added in FF-A 1.1 */ - case FFA_NOTIFICATION_BIND: case FFA_NOTIFICATION_UNBIND: case FFA_NOTIFICATION_SET: case FFA_NOTIFICATION_GET:
@@ -891,6 +892,27 @@ static void do_ffa_notif_bitmap(struct arm_smccc_1_2_regs *res, hyp_smccc_1_2_smc(args, res); } +static void do_ffa_notif_bind(struct arm_smccc_1_2_regs *res, + struct kvm_cpu_context *ctxt) +{ + DECLARE_REG(u32, endp_id, ctxt, 1); + DECLARE_REG(u32, flags, ctxt, 2); + struct arm_smccc_1_2_regs *args; + + if (FIELD_GET(FFA_NOTIF_RECEIVER_ENDP_MASK, endp_id) != HOST_FFA_ID) { + ffa_to_smccc_res(res, FFA_RET_INVALID_PARAMETERS); + return; + } + + if (flags > 1) { + ffa_to_smccc_res(res, FFA_RET_INVALID_PARAMETERS); + return; + } + + args = (void *)&ctxt->regs.regs[0]; + hyp_smccc_1_2_smc(args, res); +} + bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id) { struct arm_smccc_1_2_regs res = {0};
@@ -953,6 +975,9 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id) case FFA_NOTIFICATION_BITMAP_DESTROY: do_ffa_notif_bitmap(&res, host_ctxt); goto out_handled; + case FFA_NOTIFICATION_BIND: + do_ffa_notif_bind(&res, host_ctxt); + goto out_handled; } if (ffa_call_supported(func_id))
--
2.55.0.979.g7e5102b832-goog