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WHPX: TSC get and set should be dependent on VM state

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Currently, TSC is set as part of the VM runtime state. Setting TSC at
runtime is heavy and additionally can have side effects on the guest,
which are not very resilient to variances in the TSC. This patch uses
the VM state to determine whether to set TSC or not. Some minor
enhancements for getting TSC values as well that considers the VM state.

Additionally, while setting the TSC, the partition is suspended to
reduce the variance in the TSC value across vCPUs.

Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Message-Id: <SN4PR2101MB08804D23439166E81FF151F7C0EA0@SN4PR2101MB0880.namprd21.prod.outlook.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sunil Muthuswamy 2020-02-26 20:54:39 +00:00 • committed by Paolo Bonzini
parent 27f08ea1c7
commit 6785e76701
3 changed files with 110 additions and 9 deletions
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7
include/sysemu/whpx.h
View file

@ -35,4 +35,11 @@ int whpx_enabled(void);
#endif /* CONFIG_WHPX */
/* state subset only touched by the VCPU itself during runtime */
#define WHPX_SET_RUNTIME_STATE 1
/* state subset modified during VCPU reset */
#define WHPX_SET_RESET_STATE 2
/* full state set, modified during initialization or on vmload */
#define WHPX_SET_FULL_STATE 3
#endif /* QEMU_WHPX_H */