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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [RFC PATCH 1/4] xen/arm: ffa: Introduce VM to VM support
Create a CONFIG_FFA_VM_TO_VM parameter to activate FFA communication
between VMs.
When activated list VMs in the system with FF-A support in part_info_get.
WARNING: There is no filtering for now and all VMs are listed !!
Signed-off-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
---
xen/arch/arm/tee/Kconfig | 11 +++
xen/arch/arm/tee/ffa_partinfo.c | 135 ++++++++++++++++++++++++++------
xen/arch/arm/tee/ffa_private.h | 12 +++
3 files changed, 135 insertions(+), 23 deletions(-)
diff --git a/xen/arch/arm/tee/Kconfig b/xen/arch/arm/tee/Kconfig
index c5b0f88d7522..88a4c4c99154 100644
--- a/xen/arch/arm/tee/Kconfig
+++ b/xen/arch/arm/tee/Kconfig
@@ -28,5 +28,16 @@ config FFA
[1] https://developer.arm.com/documentation/den0077/latest
+config FFA_VM_TO_VM
+ bool "Enable FF-A between VMs (UNSUPPORTED)" if UNSUPPORTED
+ default n
+ depends on FFA
+ help
+ This option enables to use FF-A between VMs.
+ This is experimental and there is no access control so any
+ guest can communicate with any other guest.
+
+ If unsure, say N.
+
endmenu
diff --git a/xen/arch/arm/tee/ffa_partinfo.c b/xen/arch/arm/tee/ffa_partinfo.c
index fde187dba4e5..d699a267cc76 100644
--- a/xen/arch/arm/tee/ffa_partinfo.c
+++ b/xen/arch/arm/tee/ffa_partinfo.c
@@ -77,7 +77,21 @@ void ffa_handle_partition_info_get(struct cpu_user_regs
*regs)
};
uint32_t src_size, dst_size;
void *dst_buf;
- uint32_t ffa_sp_count = 0;
+ uint32_t ffa_vm_count = 0, ffa_sp_count = 0;
+#ifdef CONFIG_FFA_VM_TO_VM
+ struct domain *dom;
+
+ /* Count the number of VM with FF-A support */
+ rcu_read_lock(&domlist_read_lock);
+ for_each_domain( dom )
+ {
+ struct ffa_ctx *vm = dom->arch.tee;
+
+ if (dom != d && vm != NULL && vm->guest_vers != 0)
+ ffa_vm_count++;
+ }
+ rcu_read_unlock(&domlist_read_lock);
+#endif
/*
* If the guest is v1.0, he does not get back the entry size so we must
@@ -127,33 +141,38 @@ void ffa_handle_partition_info_get(struct cpu_user_regs
*regs)
dst_buf = ctx->rx;
- if ( !ffa_rx )
+ /* If not supported, we have ffa_sp_count=0 */
+ if ( ffa_fw_supports_fid(FFA_PARTITION_INFO_GET) )
{
- ret = FFA_RET_DENIED;
- goto out_rx_release;
- }
+ if ( !ffa_rx )
+ {
+ ret = FFA_RET_DENIED;
+ goto out_rx_release;
+ }
- spin_lock(&ffa_rx_buffer_lock);
+ spin_lock(&ffa_rx_buffer_lock);
- ret = ffa_partition_info_get(uuid, 0, &ffa_sp_count, &src_size);
+ ret = ffa_partition_info_get(uuid, 0, &ffa_sp_count, &src_size);
- if ( ret )
- goto out_rx_hyp_unlock;
+ if ( ret )
+ goto out_rx_hyp_unlock;
- /*
- * ffa_partition_info_get() succeeded so we now own the RX buffer we
- * share with the SPMC. We must give it back using ffa_hyp_rx_release()
- * once we've copied the content.
- */
+ /*
+ * ffa_partition_info_get() succeeded so we now own the RX buffer we
+ * share with the SPMC. We must give it back using ffa_hyp_rx_release()
+ * once we've copied the content.
+ */
- /* we cannot have a size smaller than 1.0 structure */
- if ( src_size < sizeof(struct ffa_partition_info_1_0) )
- {
- ret = FFA_RET_NOT_SUPPORTED;
- goto out_rx_hyp_release;
+ /* we cannot have a size smaller than 1.0 structure */
+ if ( src_size < sizeof(struct ffa_partition_info_1_0) )
+ {
+ ret = FFA_RET_NOT_SUPPORTED;
+ goto out_rx_hyp_release;
+ }
}
- if ( ctx->page_count * FFA_PAGE_SIZE < ffa_sp_count * dst_size )
+ if ( ctx->page_count * FFA_PAGE_SIZE <
+ (ffa_sp_count + ffa_vm_count) * dst_size )
{
ret = FFA_RET_NO_MEMORY;
goto out_rx_hyp_release;
@@ -185,18 +204,88 @@ void ffa_handle_partition_info_get(struct cpu_user_regs
*regs)
}
}
+ if ( ffa_fw_supports_fid(FFA_PARTITION_INFO_GET) )
+ {
+ ffa_hyp_rx_release();
+ spin_unlock(&ffa_rx_buffer_lock);
+ }
+
+#ifdef CONFIG_FFA_VM_TO_VM
+ if ( ffa_vm_count )
+ {
+ uint32_t curr = 0;
+ /* add the VM informations if any */
+ rcu_read_lock(&domlist_read_lock);
+ for_each_domain( dom )
+ {
+ struct ffa_ctx *vm = dom->arch.tee;
+
+ /*
+ * we do not add the VM calling to the list and only VMs with
+ * FF-A support
+ */
+ if (dom != d && vm != NULL && vm->guest_vers != 0)
+ {
+ /*
+ * We do not have UUID info for VMs so use
+ * the 1.0 structure so that we set UUIDs to
+ * zero using memset
+ */
+ struct ffa_partition_info_1_0 srcvm;
+
+ if ( curr == ffa_vm_count )
+ {
+ /*
+ * The number of domains changed since we counted them, we
+ * can add new ones if there is enough space in the
+ * destination buffer so check it or go out with an error.
+ */
+ ffa_vm_count++;
+ if ( ctx->page_count * FFA_PAGE_SIZE <
+ (ffa_sp_count + ffa_vm_count) * dst_size )
+ {
+ ret = FFA_RET_NO_MEMORY;
+ rcu_read_unlock(&domlist_read_lock);
+ goto out_rx_release;
+ }
+ }
+
+ srcvm.id = ffa_get_vm_id(dom);
+ srcvm.execution_context = dom->max_vcpus;
+ srcvm.partition_properties = FFA_PART_VM_PROP;
+ if ( is_64bit_domain(dom) )
+ srcvm.partition_properties |= FFA_PART_PROP_AARCH64_STATE;
+
+ memcpy(dst_buf, &srcvm, MIN(sizeof(srcvm), dst_size));
+
+ if ( dst_size > sizeof(srcvm) )
+ memset(dst_buf + sizeof(srcvm), 0,
+ dst_size - sizeof(srcvm));
+
+ dst_buf += dst_size;
+ curr++;
+ }
+ }
+ rcu_read_unlock(&domlist_read_lock);
+
+ /* the number of domains could have reduce since the initial count */
+ ffa_vm_count = curr;
+ }
+#endif
+
+ goto out;
+
out_rx_hyp_release:
ffa_hyp_rx_release();
out_rx_hyp_unlock:
spin_unlock(&ffa_rx_buffer_lock);
out_rx_release:
- if ( ret != FFA_RET_OK )
- ffa_rx_release(d);
+ ffa_rx_release(d);
out:
if ( ret )
ffa_set_regs_error(regs, ret);
else
- ffa_set_regs_success(regs, ffa_sp_count, dst_size);
+ ffa_set_regs_success(regs, ffa_sp_count + ffa_vm_count, dst_size);
}
static int32_t ffa_direct_req_send_vm(uint16_t sp_id, uint16_t vm_id,
diff --git a/xen/arch/arm/tee/ffa_private.h b/xen/arch/arm/tee/ffa_private.h
index d441c0ca5598..47dd6b5fadea 100644
--- a/xen/arch/arm/tee/ffa_private.h
+++ b/xen/arch/arm/tee/ffa_private.h
@@ -187,6 +187,18 @@
*/
#define FFA_PARTITION_INFO_GET_COUNT_FLAG BIT(0, U)
+/*
+ * Partition properties we give for a normal world VM:
+ * - can send direct message but not receive them
+ * - can handle indirect messages
+ * - can receive notifications
+ * 32/64 bit flag is set depending on the VM
+ */
+#define FFA_PART_VM_PROP (FFA_PART_PROP_DIRECT_REQ_SEND | \
+ FFA_PART_PROP_INDIRECT_MSGS | \
+ FFA_PART_PROP_RECV_NOTIF | \
+ FFA_PART_PROP_IS_PE_ID)
+
/* Flags used in calls to FFA_NOTIFICATION_GET interface */
#define FFA_NOTIF_FLAG_BITMAP_SP BIT(0, U)
#define FFA_NOTIF_FLAG_BITMAP_VM BIT(1, U)
--
2.47.0
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