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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.

Signed-off-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20230523101828.7328-10-will@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Fuad Tabba 2023-05-23 11:18:26 +01:00 committed by Oliver Upton
parent 634d90cf0a
commit 20936cd114
1 changed files with 41 additions and 4 deletions
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45
arch/arm64/kvm/hyp/nvhe/ffa.c
View file

@ -64,15 +64,21 @@ static void ffa_to_smccc_error(struct arm_smccc_res *res, u64 ffa_errno)
};
}
static void ffa_to_smccc_res(struct arm_smccc_res *res, int ret)
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 };
*res = (struct arm_smccc_res) { .a0 = FFA_SUCCESS,
.a2 = prop };
} else {
ffa_to_smccc_error(res, ret);
}
}
static void ffa_to_smccc_res(struct arm_smccc_res *res, int ret)
{
ffa_to_smccc_res_prop(res, ret, 0);
}
static void ffa_set_retval(struct kvm_cpu_context *ctxt,
struct arm_smccc_res *res)
{
@ -484,14 +490,41 @@ static bool ffa_call_supported(u64 func_id)
case FFA_RXTX_MAP:
case FFA_MEM_DONATE:
case FFA_MEM_RETRIEVE_REQ:
/* Don't advertise any features just yet */
case FFA_FEATURES:
return false;
}
return true;
}
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_supported(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);
@ -514,6 +547,10 @@ 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:
do_ffa_rxtx_map(&res, host_ctxt);