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KVM: arm64: Add support for FFA_PARTITION_INFO_GET

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Handle the FFA_PARTITION_INFO_GET host call inside the pKVM hypervisor
and copy the response message back to the host buffers.

Signed-off-by: Sebastian Ene <sebastianene@google.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240613132035.1070360-3-sebastianene@google.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Sebastian Ene 2024-06-13 13:20:33 +00:00 committed by Oliver Upton
parent c9c012625e
commit 894376385a
2 changed files with 55 additions and 0 deletions
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52
arch/arm64/kvm/hyp/nvhe/ffa.c
View File

@ -719,6 +719,55 @@ static void do_ffa_version(struct arm_smccc_res *res,
hyp_spin_unlock(&version_lock);
}
static void do_ffa_part_get(struct arm_smccc_res *res,
struct kvm_cpu_context *ctxt)
{
DECLARE_REG(u32, uuid0, ctxt, 1);
DECLARE_REG(u32, uuid1, ctxt, 2);
DECLARE_REG(u32, uuid2, ctxt, 3);
DECLARE_REG(u32, uuid3, ctxt, 4);
DECLARE_REG(u32, flags, ctxt, 5);
u32 count, partition_sz, copy_sz;
hyp_spin_lock(&host_buffers.lock);
if (!host_buffers.rx) {
ffa_to_smccc_res(res, FFA_RET_BUSY);
goto out_unlock;
}
arm_smccc_1_1_smc(FFA_PARTITION_INFO_GET, uuid0, uuid1,
uuid2, uuid3, flags, 0, 0,
res);
if (res->a0 != FFA_SUCCESS)
goto out_unlock;
count = res->a2;
if (!count)
goto out_unlock;
if (hyp_ffa_version > FFA_VERSION_1_0) {
/* Get the number of partitions deployed in the system */
if (flags & 0x1)
goto out_unlock;
partition_sz = res->a3;
} else {
/* FFA_VERSION_1_0 lacks the size in the response */
partition_sz = FFA_1_0_PARTITON_INFO_SZ;
}
copy_sz = partition_sz * count;
if (copy_sz > KVM_FFA_MBOX_NR_PAGES * PAGE_SIZE) {
ffa_to_smccc_res(res, FFA_RET_ABORTED);
goto out_unlock;
}
memcpy(host_buffers.rx, hyp_buffers.rx, copy_sz);
out_unlock:
hyp_spin_unlock(&host_buffers.lock);
}
bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id)
{
struct arm_smccc_res res;
@ -773,6 +822,9 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id)
case FFA_VERSION:
do_ffa_version(&res, host_ctxt);
goto out_handled;
case FFA_PARTITION_INFO_GET:
do_ffa_part_get(&res, host_ctxt);
goto out_handled;
}
if (ffa_call_supported(func_id))

3
include/linux/arm_ffa.h
View File

@ -212,6 +212,9 @@ bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
extern const struct bus_type ffa_bus_type;
/* The FF-A 1.0 partition structure lacks the uuid[4] */
#define FFA_1_0_PARTITON_INFO_SZ (8)
/* FFA transport related */
struct ffa_partition_info {
u16 id;