kernel/git/stable/linux.git/drivers/xen, branch linux-5.12.y

xen/events: reset active flag for lateeoi events later

2021-06-30T12:47:04+00:00

commit 3de218ff39b9e3f0d453fe3154f12a174de44b25 upstream. In order to avoid a race condition for user events when changing cpu affinity reset the active flag only when EOI-ing the event. This is working fine as all user events are lateeoi events. Note that lateeoi_ack_mask_dynirq() is not modified as there is no explicit call to xen_irq_lateeoi() expected later. Cc: stable@vger.kernel.org Reported-by: Julien Grall Fixes: b6622798bc50b62 ("xen/events: avoid handling the same event on two cpus at the same time") Tested-by: Julien Grall Signed-off-by: Juergen Gross Reviewed-by: Boris Ostrovsky Link: https://lore.kernel.org/r/20210623130913.9405-1-jgross@suse.com Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman

xen-pciback: reconfigure also from backend watch handler

2021-05-26T10:59:10+00:00

commit c81d3d24602540f65256f98831d0a25599ea6b87 upstream. When multiple PCI devices get assigned to a guest right at boot, libxl incrementally populates the backend tree. The writes for the first of the devices trigger the backend watch. In turn xen_pcibk_setup_backend() will set the XenBus state to Initialised, at which point no further reconfigures would happen unless a device got hotplugged. Arrange for reconfigure to also get triggered from the backend watch handler. Signed-off-by: Jan Beulich Cc: stable@vger.kernel.org Reviewed-by: Boris Ostrovsky Link: https://lore.kernel.org/r/2337cbd6-94b9-4187-9862-c03ea12e0c61@suse.com Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman

xen-pciback: redo VF placement in the virtual topology

2021-05-26T10:59:10+00:00

commit 4ba50e7c423c29639878c00573288869aa627068 upstream. The commit referenced below was incomplete: It merely affected what would get written to the vdev- xenstore node. The guest would still find the function at the original function number as long as __xen_pcibk_get_pci_dev() wouldn't be in sync. The same goes for AER wrt __xen_pcibk_get_pcifront_dev(). Undo overriding the function to zero and instead make sure that VFs at function zero remain alone in their slot. This has the added benefit of improving overall capacity, considering that there's only a total of 32 slots available right now (PCI segment and bus can both only ever be zero at present). Fixes: 8a5248fe10b1 ("xen PV passthru: assign SR-IOV virtual functions to separate virtual slots") Signed-off-by: Jan Beulich Cc: stable@vger.kernel.org Reviewed-by: Boris Ostrovsky Link: https://lore.kernel.org/r/8def783b-404c-3452-196d-3f3fd4d72c9e@suse.com Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman

xen/gntdev: fix gntdev_mmap() error exit path

2021-05-19T08:56:41+00:00

commit 970655aa9b42461f8394e4457307005bdeee14d9 upstream. Commit d3eeb1d77c5d0af ("xen/gntdev: use mmu_interval_notifier_insert") introduced an error in gntdev_mmap(): in case the call of mmu_interval_notifier_insert_locked() fails the exit path should not call mmu_interval_notifier_remove(), as this might result in NULL dereferences. One reason for failure is e.g. a signal pending for the running process. Fixes: d3eeb1d77c5d0af ("xen/gntdev: use mmu_interval_notifier_insert") Cc: stable@vger.kernel.org Reported-by: Marek Marczykowski-Górecki Tested-by: Marek Marczykowski-Górecki Signed-off-by: Juergen Gross Reviewed-by: Luca Fancellu Link: https://lore.kernel.org/r/20210423054038.26696-1-jgross@suse.com Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman

xen/unpopulated-alloc: fix error return code in fill_list()

2021-05-19T08:56:37+00:00

[ Upstream commit dbc03e81586fc33e4945263fd6e09e22eb4b980f ] Fix to return a negative error code from the error handling case instead of 0, as done elsewhere in this function. Fixes: a4574f63edc6 ("mm/memremap_pages: convert to 'struct range'") Reported-by: Hulk Robot Signed-off-by: Zhen Lei Reviewed-by: Juergen Gross Link: https://lore.kernel.org/r/20210508021913.1727-1-thunder.leizhen@huawei.com Signed-off-by: Juergen Gross Signed-off-by: Sasha Levin

Merge tag 'for-linus-5.12b-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2021-04-09T16:58:42+00:00

Pull xen fix from Juergen Gross: "A single fix of a 5.12 patch for the rather uncommon problem of running as a Xen guest with a real time kernel config" * tag 'for-linus-5.12b-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen/evtchn: Change irq_info lock to raw_spinlock_t

xen/evtchn: Change irq_info lock to raw_spinlock_t

2021-04-07T13:33:28+00:00

Unmask operation must be called with interrupt disabled, on preempt_rt spin_lock_irqsave/spin_unlock_irqrestore don't disable/enable interrupts, so use raw_* implementation and change lock variable in struct irq_info from spinlock_t to raw_spinlock_t Cc: stable@vger.kernel.org Fixes: 25da4618af24 ("xen/events: don't unmask an event channel when an eoi is pending") Signed-off-by: Luca Fancellu Reviewed-by: Julien Grall Reviewed-by: Wei Liu Link: https://lore.kernel.org/r/20210406105105.10141-1-luca.fancellu@arm.com Signed-off-by: Boris Ostrovsky

Merge tag 'for-linus-5.12b-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2021-03-26T18:15:25+00:00

Pull xen fixes from Juergen Gross: "This contains a small series with a more elegant fix of a problem which was originally fixed in rc2" * tag 'for-linus-5.12b-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: Revert "xen: fix p2m size in dom0 for disabled memory hotplug case" xen/x86: make XEN_BALLOON_MEMORY_HOTPLUG_LIMIT depend on MEMORY_HOTPLUG

xen/x86: make XEN_BALLOON_MEMORY_HOTPLUG_LIMIT depend on MEMORY_HOTPLUG

2021-03-24T23:33:11+00:00

The Xen memory hotplug limit should depend on the memory hotplug generic option, rather than the Xen balloon configuration. It's possible to have a kernel with generic memory hotplug enabled, but without Xen balloon enabled, at which point memory hotplug won't work correctly due to the size limitation of the p2m. Rename the option to XEN_MEMORY_HOTPLUG_LIMIT since it's no longer tied to ballooning. Fixes: 9e2369c06c8a18 ("xen: add helpers to allocate unpopulated memory") Signed-off-by: Roger Pau Monné Reviewed-by: Boris Ostrovsky Link: https://lore.kernel.org/r/20210324122424.58685-2-roger.pau@citrix.com Signed-off-by: Boris Ostrovsky

Merge tag 'for-linus-5.12b-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2021-03-12T19:34:36+00:00

Pull xen fixes from Juergen Gross: "Two fix series and a single cleanup: - a small cleanup patch to remove unneeded symbol exports - a series to cleanup Xen grant handling (avoiding allocations in some cases, and using common defines for "invalid" values) - a series to address a race issue in Xen event channel handling" * tag 'for-linus-5.12b-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: Xen/gntdev: don't needlessly use kvcalloc() Xen/gnttab: introduce common INVALID_GRANT_{HANDLE,REF} Xen/gntdev: don't needlessly allocate k{,un}map_ops[] Xen: drop exports of {set,clear}_foreign_p2m_mapping() xen/events: avoid handling the same event on two cpus at the same time xen/events: don't unmask an event channel when an eoi is pending xen/events: reset affinity of 2-level event when tearing it down