Branch: refs/heads/next
Home: https://github.com/siemens/jailhouse
Commit: ae8b272f997bc720efc7f18476e5a407e2580ead
https://github.com/siemens/jailhouse/commit/ae8b272f997bc720efc7f18476e5a407e2580ead
Author: Jan Kiszka <[email protected]>
Date: 2019-01-27 (Sun, 27 Jan 2019)
Changed paths:
M hypervisor/arch/x86/vtd.c
Log Message:
-----------
x86: vtd: Ignore lower two bits when evaluating VTD_REQ_INV_WAIT
If the guest sets the wait request status address to the top of the
page, we crossed the border to the next page and either wrote some bytes
into a guest page that was previously mapped at page 2 in the temporary
mapping range, or we crashed the hypervisor on a fault if nothing was
mapped before.
Fix this by masking out the two lowest bits of the status address which
are actually reserved according to the Intel manual.
Along that, replace the hard-coded shift value with the right symbolic
constant.
Fixes: 20b09b8625d5 ("x86: Emulate interrupt remapping support to enable x2APIC
usage")
Signed-off-by: Jan Kiszka <[email protected]>
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