[PATCH v9 5/7] KVM: arm64: Support FFA_NOTIFICATION_GET in host handler
From: Sebastian Ene <hidden>
Date: 2026-09-07 17:19:45
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
Allow FF-A notification GET messages to be proxied from the pKVM hypervisor to Trustzone and verify the arguments sent from the host driver. Reviewed-by: Vincent Donnefort <redacted> Signed-off-by: Sebastian Ene <redacted> --- arch/arm64/kvm/hyp/nvhe/ffa.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c
index 923f32caa04b..e11fb06df63d 100644
--- a/arch/arm64/kvm/hyp/nvhe/ffa.c
+++ b/arch/arm64/kvm/hyp/nvhe/ffa.c@@ -695,7 +695,6 @@ 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_GET: case FFA_NOTIFICATION_INFO_GET: /* Optional interfaces added in FF-A 1.2 */ case FFA_MSG_SEND_DIRECT_REQ2: /* Optional per 7.5.1 */
@@ -954,6 +953,27 @@ static void do_ffa_notif_set(struct arm_smccc_1_2_regs *res, hyp_smccc_1_2_smc(args, res); } +static void do_ffa_notif_get(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 & GENMASK(31, 4)) { + 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};
@@ -1025,6 +1045,9 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id) case FFA_NOTIFICATION_SET: do_ffa_notif_set(&res, host_ctxt); goto out_handled; + case FFA_NOTIFICATION_GET: + do_ffa_notif_get(&res, host_ctxt); + goto out_handled; } if (ffa_call_supported(func_id))
--
2.55.0.979.g7e5102b832-goog