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
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