[PULL,3/7] hw/nvme: fix BAR size mismatch of SR-IOV VF

Commit Message

Klaus Jensen July 11, 2024, 6:04 p.m. UTC

From: Minwoo Im <[e-mail]>

PF initializes SR-IOV VF BAR0 region in nvme_init_sriov() with bar_size
calcaulted by Primary Controller Capability such as VQFRSM and VIFRSM
rather than `max_ioqpairs` and `msix_qsize` which is for PF only.

In this case, the bar size reported in nvme_init_sriov() by PF and
nvme_init_pci() by VF might differ especially with large number of
sriov_max_vfs (e.g., 127 which is curret maximum number of VFs).  And
this reports invalid BAR0 address of VFs to the host operating system
so that MMIO access will not be caught properly and, of course, NVMe
driver initialization is failed.

For example, if we give the following options, BAR size will be
initialized by PF with 4K, but VF will try to allocate 8K BAR0 size in
nvme_init_pci().

	#!/bin/bash

	nr_vf=$((127))
	nr_vq=$(($nr_vf * 2 + 2))
	nr_vi=$(($nr_vq / 2 + 1))
	nr_ioq=$(($nr_vq + 2))

	...

	-device nvme,serial=foo,id=nvme0,bus=rp2,subsys=subsys0,mdts=9,msix_qsize=$nr_ioq,max_ioqpairs=$nr_ioq,sriov_max_vfs=$nr_vf,sriov_vq_flexible=$nr_vq,sriov_vi_flexible=$nr_vi \

To fix this issue, this patch modifies the calculation of BAR size in
the PF and VF initialization by using different elements:

	PF: `max_ioqpairs + 1` with `msix_qsize`
	VF: VQFRSM with VIFRSM

Signed-off-by: Minwoo Im <[e-mail]>
Reviewed-by: Klaus Jensen <[e-mail]>
Signed-off-by: Klaus Jensen <[e-mail]>
---
 hw/nvme/ctrl.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

Patch

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 231e1127cec8..f3ae54896f6d 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -8104,6 +8104,7 @@  static bool nvme_init_pci(NvmeCtrl *n, PCIDevice *pci_dev, Error **errp)
     uint8_t *pci_conf = pci_dev->config;
     uint64_t bar_size;
     unsigned msix_table_offset = 0, msix_pba_offset = 0;
+    unsigned nr_vectors;
     int ret;
 
     pci_conf[PCI_INTERRUPT_PIN] = 1;
@@ -8136,9 +8137,19 @@  static bool nvme_init_pci(NvmeCtrl *n, PCIDevice *pci_dev, Error **errp)
         assert(n->params.msix_qsize >= 1);
 
         /* add one to max_ioqpairs to account for the admin queue pair */
-        bar_size = nvme_mbar_size(n->params.max_ioqpairs + 1,
-                                  n->params.msix_qsize, &msix_table_offset,
-                                  &msix_pba_offset);
+        if (!pci_is_vf(pci_dev)) {
+            nr_vectors = n->params.msix_qsize;
+            bar_size = nvme_mbar_size(n->params.max_ioqpairs + 1,
+                                      nr_vectors, &msix_table_offset,
+                                      &msix_pba_offset);
+        } else {
+            NvmeCtrl *pn = NVME(pcie_sriov_get_pf(pci_dev));
+            NvmePriCtrlCap *cap = &pn->pri_ctrl_cap;
+
+            nr_vectors = le16_to_cpu(cap->vifrsm);
+            bar_size = nvme_mbar_size(le16_to_cpu(cap->vqfrsm), nr_vectors,
+                                      &msix_table_offset, &msix_pba_offset);
+        }
 
         memory_region_init(&n->bar0, OBJECT(n), "nvme-bar0", bar_size);
         memory_region_init_io(&n->iomem, OBJECT(n), &nvme_mmio_ops, n, "nvme",
@@ -8152,7 +8163,7 @@  static bool nvme_init_pci(NvmeCtrl *n, PCIDevice *pci_dev, Error **errp)
                              PCI_BASE_ADDRESS_MEM_TYPE_64, &n->bar0);
         }
 
-        ret = msix_init(pci_dev, n->params.msix_qsize,
+        ret = msix_init(pci_dev, nr_vectors,
                         &n->bar0, 0, msix_table_offset,
                         &n->bar0, 0, msix_pba_offset, 0, errp);
     }