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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 /virt | |
| 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 'virt')
| -rw-r--r-- | virt/kvm/arm/arm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index bd5c55916d0d..f149c79fd6ef 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -1332,6 +1332,8 @@ static void cpu_hyp_reset(void) static void cpu_hyp_reinit(void) { + kvm_init_host_cpu_context(&this_cpu_ptr(&kvm_host_data)->host_ctxt); + cpu_hyp_reset(); if (is_kernel_in_hyp_mode()) @@ -1569,7 +1571,6 @@ static int init_hyp_mode(void) kvm_host_data_t *cpu_data; cpu_data = per_cpu_ptr(&kvm_host_data, cpu); - kvm_init_host_cpu_context(&cpu_data->host_ctxt, cpu); err = create_hyp_mappings(cpu_data, cpu_data + 1, PAGE_HYP); if (err) { |