Hi, probing of platform UARTs is a problem for x86 jailhouse non-root cells: Linux doesn't know which UARTs belong to the cell and will probe for all platform UARTs. This crashes the guest if access isn't permitted. Current workarounds (tuning via 8250.nr_uarts) are hacky and limited.
But we do have some flags inside setup_data that indicate availability of UARTs, so simply use it. Ralf since v2: - avoid imbalances of early_memremap and early_memunmap since v1: - setup data version check wasn't really prepared for extensions of the structure. Add a patch that improves the checks. Ralf Ramsauer (2): x86/jailhouse: improve setup data version comparison x86/jailhouse: Only enable platform UARTs if available arch/x86/include/uapi/asm/bootparam.h | 25 ++++-- arch/x86/kernel/jailhouse.c | 123 +++++++++++++++++++++----- 2 files changed, 115 insertions(+), 33 deletions(-) -- 2.22.0 -- You received this message because you are subscribed to the Google Groups "Jailhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to jailhouse-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jailhouse-dev/20190819183408.988013-1-ralf.ramsauer%40oth-regensburg.de.