Commit 89437638 authored by Sebastian Ene's avatar Sebastian Ene Committed by Oliver Upton
Browse files

KVM: arm64: Add support for FFA_PARTITION_INFO_GET 



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: default avatarSebastian Ene <sebastianene@google.com>
Reviewed-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Tested-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Acked-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240613132035.1070360-3-sebastianene@google.com


Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
parent c9c01262

arch/arm64/kvm/hyp/nvhe/ffa.c

+52 −0
Original line number Diff line number Diff line
@@ -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))

include/linux/arm_ffa.h

+3 −0
Original line number Diff line number Diff line
@@ -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;