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bh=rl5HcSkZDieagd3mT3skzzxr+NNN5cBOeWYGffPcTjk=; b=aGmY+QyzhzE72OEZj/+ozrj9XC8hcuZNUKKjppFuvBN4ydd2KGZgh3qLT5pWRJLCA/o5m8 RpD+7lLwCZateKDj6767SJyQ3rdOPWXIWiL2TUWQPW2akeThhkPCXVrQn596LZTDIvwJiU aQYsbu3oCldqvfSuNsYgJeG3IpaNz3w= X-MC-Unique: qko1RICYOjy1Ih4nTcPt8A-1 From: Alex Williamson To: qemu-devel@nongnu.org Cc: clg@redhat.com, Alex Williamson Subject: [PATCH v2] vfio/pci: Static Resizable BAR capability Date: Fri, 5 May 2023 17:23:08 -0600 Message-Id: <20230505232308.2869912-1-alex.williamson@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=alex.williamson@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.161, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1683329062137100003 Content-Type: text/plain; charset="utf-8" The PCI Resizable BAR (ReBAR) capability is currently hidden from the VM because the protocol for interacting with the capability does not support a mechanism for the device to reject an advertised supported BAR size. However, when assigned to a VM, the act of resizing the BAR requires adjustment of host resources for the device, which absolutely can fail. Linux does not currently allow us to reserve resources for the device independent of the current usage. The only writable field within the ReBAR capability is the BAR Size register. The PCIe spec indicates that when written, the device should immediately begin to operate with the provided BAR size. The spec however also notes that software must only write values corresponding to supported sizes as indicated in the capability and control registers. Writing unsupported sizes produces undefined results. Therefore, if the hypervisor were to virtualize the capability and control registers such that the current size is the only indicated available size, then a write of anything other than the current size falls into the category of undefined behavior, where we can essentially expose the modified ReBAR capability as read-only. This may seem pointless, but users have reported that virtualizing the capability in this way not only allows guest software to expose related features as available (even if only cosmetic), but in some scenarios can resolve guest driver issues. Additionally, no regressions in behavior have been reported for this change. A caveat here is that the PCIe spec requires for compatibility that devices report support for a size in the range of 1MB to 512GB, therefore if the current BAR size falls outside that range we revert to hiding the capability. Signed-off-by: Alex Williamson Reviewed-by: C=C3=A9dric Le Goater --- v2: - Add spec reference - Use PCI_REBAR_CAP_SIZES to check sizes in range - Try to clarify capability bit generation - Rename s/bars/nbar/ to match #defines - More complete masking of NBAR value hw/vfio/pci.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 1 deletion(-) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index cf27f28936cb..3ab849767a92 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -2066,6 +2066,54 @@ static int vfio_add_std_cap(VFIOPCIDevice *vdev, uin= t8_t pos, Error **errp) return 0; } =20 +static int vfio_setup_rebar_ecap(VFIOPCIDevice *vdev, uint16_t pos) +{ + uint32_t ctrl; + int i, nbar; + + ctrl =3D pci_get_long(vdev->pdev.config + pos + PCI_REBAR_CTRL); + nbar =3D (ctrl & PCI_REBAR_CTRL_NBAR_MASK) >> PCI_REBAR_CTRL_NBAR_SHIF= T; + + for (i =3D 0; i < nbar; i++) { + uint32_t cap; + int size; + + ctrl =3D pci_get_long(vdev->pdev.config + pos + PCI_REBAR_CTRL + (= i * 8)); + size =3D (ctrl & PCI_REBAR_CTRL_BAR_SIZE) >> PCI_REBAR_CTRL_BAR_SH= IFT; + + /* The cap register reports sizes 1MB to 127TB, with 4 reserved bi= ts */ + cap =3D size <=3D 27 ? 1U << (size + 4) : 0; + + /* + * The PCIe spec (v6.0.1, 7.8.6) requires HW to support at least o= ne + * size in the range 1MB to 512GB. We intend to mask all sizes ex= cept + * the one currently enabled in the size field, therefore if it's + * outside the range, hide the whole capability as this virtualiza= tion + * trick won't work. If >512GB resizable BARs start to appear, we + * might need an opt-in or reservation scheme in the kernel. + */ + if (!(cap & PCI_REBAR_CAP_SIZES)) { + return -EINVAL; + } + + /* Hide all sizes reported in the ctrl reg per above requirement. = */ + ctrl &=3D (PCI_REBAR_CTRL_BAR_SIZE | + PCI_REBAR_CTRL_NBAR_MASK | + PCI_REBAR_CTRL_BAR_IDX); + + /* + * The BAR size field is RW, however we've mangled the capability + * register such that we only report a single size, ie. the current + * BAR size. A write of an unsupported value is undefined, theref= ore + * the register field is essentially RO. + */ + vfio_add_emulated_long(vdev, pos + PCI_REBAR_CAP + (i * 8), cap, ~= 0); + vfio_add_emulated_long(vdev, pos + PCI_REBAR_CTRL + (i * 8), ctrl,= ~0); + } + + return 0; +} + static void vfio_add_ext_cap(VFIOPCIDevice *vdev) { PCIDevice *pdev =3D &vdev->pdev; @@ -2139,9 +2187,13 @@ static void vfio_add_ext_cap(VFIOPCIDevice *vdev) case 0: /* kernel masked capability */ case PCI_EXT_CAP_ID_SRIOV: /* Read-only VF BARs confuse OVMF */ case PCI_EXT_CAP_ID_ARI: /* XXX Needs next function virtualization= */ - case PCI_EXT_CAP_ID_REBAR: /* Can't expose read-only */ trace_vfio_add_ext_cap_dropped(vdev->vbasedev.name, cap_id, ne= xt); break; + case PCI_EXT_CAP_ID_REBAR: + if (!vfio_setup_rebar_ecap(vdev, next)) { + pcie_add_capability(pdev, cap_id, cap_ver, next, size); + } + break; default: pcie_add_capability(pdev, cap_id, cap_ver, next, size); } --=20 2.39.2