kernel.git/drivers/xen/Kconfig, branch linux-4.20.y

xen: remove redundant 'default n' from Kconfig

2018-10-24T09:29:33Z

'default n' is the default value for any bool or tristate Kconfig setting so there is no need to write it explicitly. Also since commit f467c5640c29 ("kconfig: only write '# CONFIG_FOO is not set' for visible symbols") the Kconfig behavior is the same regardless of 'default n' being present or not: ... One side effect of (and the main motivation for) this change is making the following two definitions behave exactly the same: config FOO bool config FOO bool default n With this change, neither of these will generate a '# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied). That might make it clearer to people that a bare 'default n' is redundant. ... Signed-off-by: Bartlomiej Zolnierkiewicz Reviewed-by: Juergen Gross Signed-off-by: Juergen Gross

xen/balloon: Grammar s/Is it/It is/

2018-10-24T08:17:16Z

Signed-off-by: Geert Uytterhoeven Signed-off-by: Juergen Gross

xen: Make XEN_BACKEND selectable by DomU

2018-10-24T08:16:47Z

XEN_BACKEND doesn't actually depend on XEN_DOM0. DomUs can serve backends to other DomUs. One example is a service VM providing network backends. The original Kconfig defaulted Dom0 to y and it could be disabled. DomU could not select the option. With the new Kconfig, we default y for Dom0 and n for DomU. Either can then toggle the selection. Signed-off-by: Jason Andryuk Reviewed-by: Boris Ostrovsky Signed-off-by: Juergen Gross

xen/balloon: add runtime control for scrubbing ballooned out pages

2018-09-14T12:51:10Z

Scrubbing pages on initial balloon down can take some time, especially in nested virtualization case (nested EPT is slow). When HVM/PVH guest is started with memory= significantly lower than maxmem=, all the extra pages will be scrubbed before returning to Xen. But since most of them weren't used at all at that point, Xen needs to populate them first (from populate-on-demand pool). In nested virt case (Xen inside KVM) this slows down the guest boot by 15-30s with just 1.5GB needed to be returned to Xen. Add runtime parameter to enable/disable it, to allow initially disabling scrubbing, then enable it back during boot (for example in initramfs). Such usage relies on assumption that a) most pages ballooned out during initial boot weren't used at all, and b) even if they were, very few secrets are in the guest at that time (before any serious userspace kicks in). Convert CONFIG_XEN_SCRUB_PAGES to CONFIG_XEN_SCRUB_PAGES_DEFAULT (also enabled by default), controlling default value for the new runtime switch. Signed-off-by: Marek Marczykowski-Górecki Reviewed-by: Juergen Gross Signed-off-by: Boris Ostrovsky

xen/gntdev: Add initial support for dma-buf UAPI

2018-07-27T03:05:14Z

Add UAPI and IOCTLs for dma-buf grant device driver extension: the extension allows userspace processes and kernel modules to use Xen backed dma-buf implementation. With this extension grant references to the pages of an imported dma-buf can be exported for other domain use and grant references coming from a foreign domain can be converted into a local dma-buf for local export. Implement basic initialization and stubs for Xen DMA buffers' support. Signed-off-by: Oleksandr Andrushchenko Reviewed-by: Boris Ostrovsky Signed-off-by: Boris Ostrovsky

xen/grant-table: Allow allocating buffers suitable for DMA

2018-07-27T03:05:14Z

Extend grant table module API to allow allocating buffers that can be used for DMA operations and mapping foreign grant references on top of those. The resulting buffer is similar to the one allocated by the balloon driver in that proper memory reservation is made by ({increase|decrease}_reservation and VA mappings are updated if needed). This is useful for sharing foreign buffers with HW drivers which cannot work with scattered buffers provided by the balloon driver, but require DMAable memory instead. Signed-off-by: Oleksandr Andrushchenko Reviewed-by: Boris Ostrovsky Signed-off-by: Boris Ostrovsky

xen: XEN_ACPI_PROCESSOR is Dom0-only

2017-12-12T14:39:43Z

Add a respective dependency. Signed-off-by: Jan Beulich Reviewed-by: Juergen Gross Signed-off-by: Boris Ostrovsky

xen: introduce a Kconfig option to enable the pvcalls frontend

2017-10-31T13:05:53Z

Also add pvcalls-front to the Makefile. Signed-off-by: Stefano Stabellini Reviewed-by: Boris Ostrovsky CC: boris.ostrovsky@oracle.com CC: jgross@suse.com Signed-off-by: Boris Ostrovsky

xen: introduce a Kconfig option to enable the pvcalls backend

2017-08-31T13:45:55Z

Also add pvcalls-back to the Makefile. Signed-off-by: Stefano Stabellini Reviewed-by: Juergen Gross CC: boris.ostrovsky@oracle.com CC: jgross@suse.com Signed-off-by: Boris Ostrovsky

ARM64: XEN: Add a function to initialize Xen specific UEFI runtime services

2016-07-06T09:34:46Z

When running on Xen hypervisor, runtime services are supported through hypercall. Add a Xen specific function to initialize runtime services. Signed-off-by: Shannon Zhao Reviewed-by: Stefano Stabellini Tested-by: Julien Grall Acked-by: Catalin Marinas