s390/pci: Improve handling of unset UID (7a11c67a) · Commits · 戴 / test

When UID checking is enabled a UID value of 0 is invalid and can not be set by the user. On z/VM it is however used to indicate an unset UID. Until now, this lead to the behavior that one PCI function could be attached with UID 0 after which z/VM would prohibit further attachment. Now if the user then turns off UID checking in z/VM the user could seemingly attach additional PCI functions that would however not show up in Linux as that would not be informed of the change in UID checking mode. This is unexpected and confusing and lead to bug reports against Linux. Instead now, if we encounter an unset UID value of 0 treat it as indicating that UID checking was turned off, switch to automatic domain allocation, and warn the user of the possible misconfiguration. Signed-off-by:

Niklas Schnelle <schnelle@linux.ibm.com> Reviewed-by:

Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by:

Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/pci.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -189,6 +189,9 @@ int clp_enable_fh(struct zpci_dev *, u8);
		int clp_disable_fh(struct zpci_dev *);
		int clp_get_state(u32 fid, enum zpci_state *state);

		/* UID */
		void update_uid_checking(bool new);

		/* IOMMU Interface */
		int zpci_init_iommu(struct zpci_dev *zdev);
		void zpci_destroy_iommu(struct zpci_dev *zdev);

arch/s390/pci/pci.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -620,6 +620,13 @@ static int zpci_alloc_domain(struct zpci_dev *zdev)

		if (zpci_unique_uid) {
		zdev->domain = (u16) zdev->uid;
		if (zdev->domain == 0) {
		pr_warn("UID checking is active but no UID is set for PCI function %08x, so automatic domain allocation is used instead\n",
		zdev->fid);
		update_uid_checking(false);
		goto auto_allocate;
		}

		if (test_bit(zdev->domain, zpci_domain)) {
		spin_unlock(&zpci_domain_lock);
		pr_err("Adding PCI function %08x failed because domain %04x is already assigned\n",
		@@ -631,6 +638,7 @@ static int zpci_alloc_domain(struct zpci_dev *zdev)
		spin_unlock(&zpci_domain_lock);
		return 0;
		}
		auto_allocate:
		/*
		* We can always auto allocate domains below ZPCI_NR_DEVICES.
		* There is either a free domain or we have reached the maximum in

arch/s390/pci/pci_clp.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -24,7 +24,7 @@

		bool zpci_unique_uid;

		static void update_uid_checking(bool new)
		void update_uid_checking(bool new)
		{
		if (zpci_unique_uid != new)
		zpci_dbg(1, "uid checking:%d\n", new);

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