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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Oct 2025 13:37:17.2180 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: abfa8850-0edd-4c9f-ee25-08de16f0470b X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM3PEPF0000A78D.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB6023 Hi Ben, > > On 10/28/25 21:06, Yeoreum Yun wrote: > > Hi Ben, > > > >>> To use TPM drvier which uses CRB over FF-A with FFA_DIRECT_REQ2, > >>> support the FF-A v1.2's optinal calls by querying whether > >>> SPMC supports those. > >>> > >>> Signed-off-by: Yeoreum Yun > >>> --- > >>> arch/arm64/kvm/hyp/nvhe/ffa.c | 19 ++++++++++++++++++- > >>> 1 file changed, 18 insertions(+), 1 deletion(-) > >>> > >>> diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c > >>> index 0ae87ff61758..9ded1c6369b9 100644 > >>> --- a/arch/arm64/kvm/hyp/nvhe/ffa.c > >>> +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c > >>> @@ -646,6 +646,22 @@ static void do_ffa_mem_reclaim(struct arm_smccc_1_2_regs *res, > >>> ffa_to_smccc_res(res, ret); > >>> } > >>> > >>> +static bool ffa_1_2_optional_calls_supported(u64 func_id) > >>> +{ > >>> + struct arm_smccc_1_2_regs res; > >>> + > >>> + if (!smp_load_acquire(&has_version_negotiated) || > >>> + (FFA_MINOR_VERSION(FFA_VERSION_1_2) < 2)) > >>> + return false; > >>> + > >>> + arm_smccc_1_2_smc(&(struct arm_smccc_1_2_regs) { > >>> + .a0 = FFA_FEATURES, > >>> + .a1 = func_id, > >>> + }, &res); > >>> + > >>> + return res.a0 == FFA_SUCCESS; > >>> +} > >>> + > >>> /* > >>> * Is a given FFA function supported, either by forwarding on directly > >>> * or by handling at EL2? > >>> @@ -678,12 +694,13 @@ static bool ffa_call_supported(u64 func_id) > >>> case FFA_NOTIFICATION_SET: > >>> case FFA_NOTIFICATION_GET: > >>> case FFA_NOTIFICATION_INFO_GET: > >>> + return false; > >>> /* Optional interfaces added in FF-A 1.2 */ > >>> case FFA_MSG_SEND_DIRECT_REQ2: /* Optional per 7.5.1 */ > >>> case FFA_MSG_SEND_DIRECT_RESP2: /* Optional per 7.5.1 */ > >>> case FFA_CONSOLE_LOG: /* Optional per 13.1: not in Table 13.1 */ > >> > >> Looking at table 13.54 in the FF-A 1.2 spec FFA_CONSOLE_LOG is only supported in secure FF-A > >> instances and not from the normal world. > > > > Thanks. in that case, we can return false for FFA_CONSOLE_LOG > > unconditionally. > > > >> > >>> case FFA_PARTITION_INFO_GET_REGS: /* Optional for virtual instances per 13.1 */ > >>> - return false; > >>> + return ffa_1_2_optional_calls_supported(func_id); > >>> } > >> > >> I don't think that an smc call here is the right thing to do. This changes this from a light > >> weight deny list to an extra smc call for each ffa_msg_send_direct_req2 from the driver. > >> > >> Instead, I would expect this patch just to remove FFA_MSG_SEND_DIRECT_REQ2 from the deny list > >> and rely on the TPM driver to use FFA_FEATURES to check whether it's supported. > >> > >> So, just this change: > >> > >> @@ -679,7 +679,6 @@ static bool ffa_call_supported(u64 func_id) > >> 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 */ > >> case FFA_MSG_SEND_DIRECT_RESP2: /* Optional per 7.5.1 */ > >> case FFA_CONSOLE_LOG: /* Optional per 13.1: not in Table 13.1 */ > >> case FFA_PARTITION_INFO_GET_REGS: /* Optional for virtual instances per 13.1 */ > >> > >> Am I missing something? > > > > Nope. I think you don't think you miss anything and > > I also think about it. > > > > But, I'm not sure about "support" means in the pkvm about FF-A. > > Anyway unless the SPMC doesn't support the specific FF-A ABI, > > I don't know that's meaningful to return "TRUE" in here. > > IOW, suppose pkvm returns supports of FFA_MSG_SEND_DIRECT_REQ2 > > but user receive when it calls FFA_MSG_SEND_DIRECT_REQ2 with NOT SUPPORTED. > > As I understand it, the ffa_call_supported() is used in two places: > 1. To return NOT SUPPORTED to an FFA_FEATURE call for ffa calls that are > on the deny list. > 2. To block ffa calls if they are on the deny list. > > For both your patch and just removing FFA_MSG_SEND_DIRECT_REQ2 from the > denylist I think the behaviour is the same. > > If FFA_MSG_SEND_DIRECT_REQ2 is not supported at the spmc then: > a) an FFA_FEATURE call will return not supported > b) an FFA_MSG_SEND_DIRECT_REQ2 will return not supported > Right! I've missed the FFA_FEATURE handles via default_host_smc_handler(). As you said, it just a deny list. Thanks. I'll change it. -- Sincerely, Yeoreum Yun