Messages in this thread Patch in this message | | | Date | Thu, 18 Apr 2024 16:30:24 +0000 | Subject | [PATCH 2/4] KVM: arm64: Add support for FFA_PARTITION_INFO_GET | From | Sebastian Ene <> |
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Handle the FFA_PARTITION_INFO_GET host call inside the pKVM hypervisor and copy the response message back to the host buffers. Save the returned FF-A version as we will need it later to interpret the response from the TEE.
Signed-off-by: Sebastian Ene <sebastianene@google.com> --- arch/arm64/kvm/hyp/nvhe/ffa.c | 46 +++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+)
diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index 023712e8beeb..d53f50c73acb 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -674,6 +674,49 @@ static void do_ffa_version(struct arm_smccc_res *res, hyp_spin_unlock(&host_buffers.lock); } +static void do_ffa_part_get(struct arm_smccc_res *res, + struct kvm_cpu_context *ctxt) +{ + DECLARE_REG(u32, uuid0, ctxt, 1); + DECLARE_REG(u32, uuid1, ctxt, 2); + DECLARE_REG(u32, uuid2, ctxt, 3); + DECLARE_REG(u32, uuid3, ctxt, 4); + DECLARE_REG(u32, flags, ctxt, 5); + u32 off, count, sz, buf_sz; + + hyp_spin_lock(&host_buffers.lock); + if (!host_buffers.rx) { + ffa_to_smccc_res(res, FFA_RET_INVALID_PARAMETERS); + goto out_unlock; + } + + arm_smccc_1_1_smc(FFA_PARTITION_INFO_GET, uuid0, uuid1, + uuid2, uuid3, flags, 0, 0, + res); + + if (res->a0 != FFA_SUCCESS) + goto out_unlock; + + count = res->a2; + if (!count) + goto out_unlock; + + if (host_buffers.ffa_version > FFA_VERSION_1_0) { + buf_sz = sz = res->a3; + if (sz > sizeof(struct ffa_partition_info)) + buf_sz = sizeof(struct ffa_partition_info); + } else { + /* FFA_VERSION_1_0 lacks the size in the response */ + buf_sz = sz = 8; + } + + WARN_ON((count - 1) * sz + buf_sz > PAGE_SIZE); + for (off = 0; off < count * sz; off += sz) + memcpy(host_buffers.rx + off, hyp_buffers.rx + off, buf_sz); +out_unlock: + hyp_spin_unlock(&host_buffers.lock); +} + bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id) { struct arm_smccc_res res; @@ -723,6 +766,9 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id) case FFA_VERSION: do_ffa_version(&res, host_ctxt); goto out_handled; + case FFA_PARTITION_INFO_GET: + do_ffa_part_get(&res, host_ctxt); + goto out_handled; } if (ffa_call_supported(func_id)) -- 2.44.0.769.g3c40516874-goog
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