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| author |   Marc Zyngier <marc.zyngier@arm.com> | 2019-07-05 23:35:56 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2019-07-08 16:29:48 +0100 |
| commit | 1e0cf16cdad1ba53e9eeee8746fe57de42f20c97 (patch) | |
| tree | 664d34bdb34d0e9e7ee193932c225ed49a4db80e /tools/testing/selftests | |
| parent | KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s (diff) | |
| download | linux-dev-1e0cf16cdad1ba53e9eeee8746fe57de42f20c97.tar.xz linux-dev-1e0cf16cdad1ba53e9eeee8746fe57de42f20c97.zip | |
KVM: arm/arm64: Initialise host's MPIDRs by reading the actual register
As part of setting up the host context, we populate its
MPIDR by using cpu_logical_map(). It turns out that contrary
to arm64, cpu_logical_map() on 32bit ARM doesn't return the
*full* MPIDR, but a truncated version.
This leaves the host MPIDR slightly corrupted after the first
run of a VM, since we won't correctly restore the MPIDR on
exit. Oops.
Since we cannot trust cpu_logical_map(), let's adopt a different
strategy. We move the initialization of the host CPU context as
part of the per-CPU initialization (which, in retrospect, makes
a lot of sense), and directly read the MPIDR from the HW. This
is guaranteed to work on both arm and arm64.
Reported-by: Andre Przywara <Andre.Przywara@arm.com>
Tested-by: Andre Przywara <Andre.Przywara@arm.com>
Fixes: 32f139551954 ("arm/arm64: KVM: Statically configure the host's view of MPIDR")
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'tools/testing/selftests')
0 files changed, 0 insertions, 0 deletions