diff options
| author | Will Deacon <will@kernel.org> | 2023-05-23 13:18:19 +0300 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-06-02 00:34:50 +0300 |
| commit | 12bdce4f41197a1a97ba1c711f77d557841e13d9 (patch) | |
| tree | 48fe3238f4dfd410dad2a2df563c788b795e6d94 /arch/arm64/kvm | |
| parent | 048be5fea43deef7e96c0de5ba05515c5cbe28cb (diff) | |
| download | linux-12bdce4f41197a1a97ba1c711f77d557841e13d9.tar.xz | |
KVM: arm64: Probe FF-A version and host/hyp partition ID during init
Probe FF-A during pKVM initialisation so that we can detect any
inconsistencies in the version or partition ID early on.
Signed-off-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20230523101828.7328-3-will@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/arm.c | 1 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/include/nvhe/ffa.h | 1 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/ffa.c | 30 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/setup.c | 5 |
4 files changed, 37 insertions, 0 deletions
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 14391826241c..41395693f3e2 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1910,6 +1910,7 @@ static bool __init init_psci_relay(void) } kvm_host_psci_config.version = psci_ops.get_version(); + kvm_host_psci_config.smccc_version = arm_smccc_get_version(); if (kvm_host_psci_config.version == PSCI_VERSION(0, 1)) { kvm_host_psci_config.function_ids_0_1 = get_psci_0_1_function_ids(); diff --git a/arch/arm64/kvm/hyp/include/nvhe/ffa.h b/arch/arm64/kvm/hyp/include/nvhe/ffa.h index fc09ec671e24..5c9b92430ff3 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/ffa.h +++ b/arch/arm64/kvm/hyp/include/nvhe/ffa.h @@ -11,6 +11,7 @@ #define FFA_MIN_FUNC_NUM 0x60 #define FFA_MAX_FUNC_NUM 0x7F +int hyp_ffa_init(void); bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt); #endif /* __KVM_HYP_FFA_H */ diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index 302806928a64..abdcaf98d9b0 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -31,6 +31,12 @@ #include <nvhe/ffa.h> #include <nvhe/trap_handler.h> +/* + * "ID value 0 must be returned at the Non-secure physical FF-A instance" + * We share this ID with the host. + */ +#define HOST_FFA_ID 0 + static void ffa_to_smccc_error(struct arm_smccc_res *res, u64 ffa_errno) { *res = (struct arm_smccc_res) { @@ -117,3 +123,27 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt) ffa_set_retval(host_ctxt, &res); return true; } + +int hyp_ffa_init(void) +{ + struct arm_smccc_res res; + + if (kvm_host_psci_config.smccc_version < ARM_SMCCC_VERSION_1_2) + return 0; + + arm_smccc_1_1_smc(FFA_VERSION, FFA_VERSION_1_0, 0, 0, 0, 0, 0, 0, &res); + if (res.a0 == FFA_RET_NOT_SUPPORTED) + return 0; + + if (res.a0 != FFA_VERSION_1_0) + return -EOPNOTSUPP; + + arm_smccc_1_1_smc(FFA_ID_GET, 0, 0, 0, 0, 0, 0, 0, &res); + if (res.a0 != FFA_SUCCESS) + return -EOPNOTSUPP; + + if (res.a2 != HOST_FFA_ID) + return -EINVAL; + + return 0; +} diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setup.c index 110f04627785..c4ca174a0592 100644 --- a/arch/arm64/kvm/hyp/nvhe/setup.c +++ b/arch/arm64/kvm/hyp/nvhe/setup.c @@ -11,6 +11,7 @@ #include <asm/kvm_pkvm.h> #include <nvhe/early_alloc.h> +#include <nvhe/ffa.h> #include <nvhe/fixed_config.h> #include <nvhe/gfp.h> #include <nvhe/memory.h> @@ -314,6 +315,10 @@ void __noreturn __pkvm_init_finalise(void) if (ret) goto out; + ret = hyp_ffa_init(); + if (ret) + goto out; + pkvm_hyp_vm_table_init(vm_table_base); out: /* |