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FROMLIST: KVM: arm64: Handle FFA_FEATURES call from the host

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Filter out advertising unsupported features, and only advertise
features and properties that are supported by the hypervisor proxy.

Bug: 254811097
Change-Id: I071766d6d241f4bdd00b8f80e6b237c184a1e59a
Signed-off-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20221116170335.2341003-6-qperret@google.com
Signed-off-by: Quentin Perret <qperret@google.com>
This commit is contained in:
Fuad Tabba
2022-11-16 17:03:28 +00:00
committed by Quentin Perret
parent 376236b858
commit a805114bc5
1 changed files with 44 additions and 0 deletions
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44
arch/arm64/kvm/hyp/nvhe/ffa.c
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@@ -45,6 +45,16 @@ static void ffa_to_smccc_error(struct arm_smccc_res *res, u64 ffa_errno)
};
}
static void ffa_to_smccc_res_prop(struct arm_smccc_res *res, int ret, u64 prop)
{
if (ret == FFA_RET_SUCCESS) {
*res = (struct arm_smccc_res) { .a0 = FFA_SUCCESS,
.a2 = prop };
} else {
ffa_to_smccc_error(res, ret);
}
}
static void ffa_set_retval(struct kvm_cpu_context *ctxt,
struct arm_smccc_res *res)
{
@@ -89,6 +99,35 @@ static bool ffa_call_unsupported(u64 func_id)
return false;
}
static bool do_ffa_features(struct arm_smccc_res *res,
struct kvm_cpu_context *ctxt)
{
DECLARE_REG(u32, id, ctxt, 1);
u64 prop = 0;
int ret = 0;
if (ffa_call_unsupported(id)) {
ret = FFA_RET_NOT_SUPPORTED;
goto out_handled;
}
switch (id) {
case FFA_MEM_SHARE:
case FFA_FN64_MEM_SHARE:
case FFA_MEM_LEND:
case FFA_FN64_MEM_LEND:
ret = FFA_RET_SUCCESS;
prop = 0; /* No support for dynamic buffers */
goto out_handled;
default:
return false;
}
out_handled:
ffa_to_smccc_res_prop(res, ret, prop);
return true;
}
bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt)
{
DECLARE_REG(u64, func_id, host_ctxt, 0);
@@ -98,6 +137,10 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt)
return false;
switch (func_id) {
case FFA_FEATURES:
if (!do_ffa_features(&res, host_ctxt))
return false;
goto out_handled;
/* Memory management */
case FFA_FN64_RXTX_MAP:
case FFA_RXTX_UNMAP:
@@ -114,6 +157,7 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt)
return false; /* Pass through */
ffa_to_smccc_error(&res, FFA_RET_NOT_SUPPORTED);
out_handled:
ffa_set_retval(host_ctxt, &res);
return true;
}