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authorAndrew Jones <drjones@redhat.com>2020-01-30 16:02:06 +0000
committerPeter Maydell <peter.maydell@linaro.org>2020-01-30 16:02:06 +0000
commite5ac4200b4cddf44df9adbef677af0d1f1c579c6 (patch)
tree5637c03cc1e04a6e25841a29f1c24de550f86346 /target/arm/cpu.c
parent789a35efb583464f9fcd5d871a7fd6164318bb91 (diff)
target/arm/kvm: Implement virtual time adjustment
When a VM is stopped (such as when it's paused) guest virtual time should stop counting. Otherwise, when the VM is resumed it will experience time jumps and its kernel may report soft lockups. Not counting virtual time while the VM is stopped has the side effect of making the guest's time appear to lag when compared with real time, and even with time derived from the physical counter. For this reason, this change, which is enabled by default, comes with a KVM CPU feature allowing it to be disabled, restoring legacy behavior. This patch only provides the implementation of the virtual time adjustment. A subsequent patch will provide the CPU property allowing the change to be enabled and disabled. Reported-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com> Signed-off-by: Andrew Jones <drjones@redhat.com> Message-id: 20200120101023.16030-6-drjones@redhat.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target/arm/cpu.c')
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