Messages in this thread | | | From | Ralf Ramsauer <> | Subject | [PATCH v5 0/2] x86/jailhouse: improve probing of platform UARTs | Date | Mon, 7 Oct 2019 14:38:17 +0200 |
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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 v4: - Link: https://lore.kernel.org/r/20190909151030.152012-1-ralf.ramsauer@oth-regensburg.de alt: https://www.mail-archive.com/jailhouse-dev@googlegroups.com/msg07483.html - rebase and test on latest master and resolve conflicts - Add linux-kernel ML
since v3: - Link: https://lore.kernel.org/r/20190819183408.988013-1-ralf.ramsauer@oth-regensburg.de alt: https://www.mail-archive.com/jailhouse-dev@googlegroups.com/msg07365.html - Address Thomas' comments (and it really looks nicer) - Address Jan's comment on patch 1 and add his Reviewed-by tag
since v2: - Link: https://lore.kernel.org/r/20190812110650.631305-1-ralf.ramsauer@oth-regensburg.de alt: https://www.mail-archive.com/jailhouse-dev@googlegroups.com/msg07334.html - avoid imbalances of early_memremap and early_memunmap
since v1: - Link: https://lore.kernel.org/r/20190802123333.4008-1-ralf.ramsauer@oth-regensburg.de - alt: https://www.mail-archive.com/jailhouse-dev@googlegroups.com/msg07283.html - 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 | 131 ++++++++++++++++++++------ 2 files changed, 117 insertions(+), 39 deletions(-)
-- 2.23.0
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