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Olaf Hering 00e37bdb01 xen PVonHVM: move shared_info to MMIO before kexec ... Currently kexec in a PVonHVM guest fails with a triple fault because the new kernel overwrites the shared info page. The exact failure depends on the size of the kernel image. This patch moves the pfn from RAM into MMIO space before the kexec boot. The pfn containing the shared_info is located somewhere in RAM. This will cause trouble if the current kernel is doing a kexec boot into a new kernel. The new kernel (and its startup code) can not know where the pfn is, so it can not reserve the page. The hypervisor will continue to update the pfn, and as a result memory corruption occours in the new kernel. One way to work around this issue is to allocate a page in the xen-platform pci device's BAR memory range. But pci init is done very late and the shared_info page is already in use very early to read the pvclock. So moving the pfn from RAM to MMIO is racy because some code paths on other vcpus could access the pfn during the small window when the old pfn is moved to the new pfn. There is even a small window were the old pfn is not backed by a mfn, and during that time all reads return -1. Because it is not known upfront where the MMIO region is located it can not be used right from the start in xen_hvm_init_shared_info. To minimise trouble the move of the pfn is done shortly before kexec. This does not eliminate the race because all vcpus are still online when the syscore_ops will be called. But hopefully there is no work pending at this point in time. Also the syscore_op is run last which reduces the risk further. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>		13 years ago
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interface	xen/pv-on-hvm kexec: shutdown watches from old kernel	13 years ago
Kbuild	…
acpi.h	xen/acpi/sleep: Enable ACPI sleep via the __acpi_os_prepare_sleep	13 years ago
balloon.h	xen-balloon: convert sysdev_class to a regular subsystem	13 years ago
events.h	xen PVonHVM: move shared_info to MMIO before kexec	13 years ago
evtchn.h	…
features.h	…
gntalloc.h	…
gntdev.h	…
grant_table.h	xenbus: Add support for xenbus backend in stub domain	13 years ago
hvc-console.h	…
hvm.h	…
page.h	…
platform_pci.h	xen: Remove hanging references to CONFIG_XEN_PLATFORM_PCI	13 years ago
privcmd.h	…
swiotlb-xen.h	X86 & IA64: adapt for dma_map_ops changes	13 years ago
tmem.h	xen/tmem: cleanup	13 years ago
xen-ops.h	Disintegrate asm/system.h for IA64	13 years ago
xen.h	…
xenbus.h	include/ and checkpatch: prefer __scanf to __attribute__((format(scanf,...)	13 years ago
xenbus_dev.h	xenbus: Add support for xenbus backend in stub domain	13 years ago
xencomm.h	…