From a38012dc69eb2fb1a660bbc88e98c882b5cf2fcb Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Fri, 17 Mar 2017 00:48:24 +0000 Subject: [PATCH] PCI: Don't update VF BARs while VF memory space is enabled [ Upstream commit 546ba9f8f22f71b0202b6ba8967be5cc6dae4e21 ] If we update a VF BAR while it's enabled, there are two potential problems: 1) Any driver that's using the VF has a cached BAR value that is stale after the update, and 2) We can't update 64-bit BARs atomically, so the intermediate state (new lower dword with old upper dword) may conflict with another device, and an access by a driver unrelated to the VF may cause a bus error. Warn about attempts to update VF BARs while they are enabled. This is a programming error, so use dev_WARN() to get a backtrace. Signed-off-by: Bjorn Helgaas Reviewed-by: Gavin Shan Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/pci/iov.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 3fb8d2a9fb96..8255d28cf115 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -566,6 +566,7 @@ void pci_iov_update_resource(struct pci_dev *dev, int resno) struct resource *res = dev->resource + resno; int vf_bar = resno - PCI_IOV_RESOURCES; struct pci_bus_region region; + u16 cmd; u32 new; int reg; @@ -577,6 +578,13 @@ void pci_iov_update_resource(struct pci_dev *dev, int resno) if (!iov) return; + pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &cmd); + if ((cmd & PCI_SRIOV_CTRL_VFE) && (cmd & PCI_SRIOV_CTRL_MSE)) { + dev_WARN(&dev->dev, "can't update enabled VF BAR%d %pR\n", + vf_bar, res); + return; + } + /* * Ignore unimplemented BARs, unused resource slots for 64-bit * BARs, and non-movable resources, e.g., those described via -- 2.20.1