From 0a5b5acdf2d8c7302ca48d42e6ef3423e1b956d5 Mon Sep 17 00:00:00 2001 From: Ankit Agrawal Date: Fri, 8 Mar 2024 14:55:24 +0000 Subject: hw/acpi: Implement the SRAT GI affinity structure ACPI spec provides a scheme to associate "Generic Initiators" [1] (e.g. heterogeneous processors and accelerators, GPUs, and I/O devices with integrated compute or DMA engines GPUs) with Proximity Domains. This is achieved using Generic Initiator Affinity Structure in SRAT. During bootup, Linux kernel parse the ACPI SRAT to determine the PXM ids and create a NUMA node for each unique PXM ID encountered. Qemu currently do not implement these structures while building SRAT. Add GI structures while building VM ACPI SRAT. The association between device and node are stored using acpi-generic-initiator object. Lookup presence of all such objects and use them to build these structures. The structure needs a PCI device handle [2] that consists of the device BDF. The vfio-pci device corresponding to the acpi-generic-initiator object is located to determine the BDF. [1] ACPI Spec 6.3, Section 5.2.16.6 [2] ACPI Spec 6.3, Table 5.80 Cc: Jonathan Cameron Cc: Alex Williamson Cc: Cedric Le Goater Reviewed-by: Jonathan Cameron Signed-off-by: Ankit Agrawal Message-Id: <20240308145525.10886-3-ankita@nvidia.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/core/numa.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'hw/core') diff --git a/hw/core/numa.c b/hw/core/numa.c index f08956d..58a32f1 100644 --- a/hw/core/numa.c +++ b/hw/core/numa.c @@ -229,7 +229,8 @@ void parse_numa_hmat_lb(NumaState *numa_state, NumaHmatLBOptions *node, node->target, numa_state->num_nodes); return; } - if (!numa_info[node->initiator].has_cpu) { + if (!numa_info[node->initiator].has_cpu && + !numa_info[node->initiator].has_gi) { error_setg(errp, "Invalid initiator=%d, it isn't an " "initiator proximity domain", node->initiator); return; -- cgit v1.1