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firmware: smccc: Support both smc and hvc conduits for getting hyp UUID

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When Linux is running as the root partition under Microsoft Hypervisor
(MSHV) a.k.a Hyper-V, smc is used as the conduit for smc calls.

Extend arm_smccc_hypervisor_has_uuid() to support this usecase. Use
arm_smccc_1_1_invoke to retrieve and use the appropriate conduit instead
of supporting only hvc.

Boot tested on MSHV guest, MSHV root & KVM guest.

Signed-off-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Roman Kisel <romank@linux.microsoft.com>
Message-Id: <20250521094049.960056-1-anirudh@anirudhrb.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Anirudh Rayabharam (Microsoft) 2025-05-21 09:40:48 +00:00 committed by Sudeep Holla
parent 19272b37aa
commit 1733432638
1 changed files with 1 additions and 4 deletions
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5
drivers/firmware/smccc/smccc.c
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@ -72,10 +72,7 @@ bool arm_smccc_hypervisor_has_uuid(const uuid_t *hyp_uuid)
struct arm_smccc_res res = {};
uuid_t uuid;
if (arm_smccc_1_1_get_conduit() != SMCCC_CONDUIT_HVC)
return false;
arm_smccc_1_1_hvc(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res);
arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res);
if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
return false;