Implement the service call for configuring a shared structure between a VCPU and the hypervisor in which the hypervisor can write the time stolen from the VCPU's execution time by other tasks on the host. User space allocates memory which is placed at an IPA also chosen by user space. The hypervisor then updates the shared structure using kvm_put_guest() to ensure single copy atomicity of the 64-bit value reporting the stolen time in nanoseconds. Whenever stolen time is enabled by the guest, the stolen time counter is reset. The stolen time itself is retrieved from the sched_info structure maintained by the Linux scheduler code. We enable SCHEDSTATS when selecting KVM Kconfig to ensure this value is meaningful.
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| @@ -35,6 +35,8 @@ typedef unsigned long gva_t; · 34 unmodified lines | |||
| 35 | typedef u64 gpa_t; | 35 | typedef u64 gpa_t; |
| 36 | typedef u64 gfn_t; | 36 | typedef u64 gfn_t; |
| 37 | 37 | ||
| 38 | #define GPA_INVALID (~(gpa_t)0) | ||
| 39 | |||
| 38 | typedef unsigned long hva_t; | 40 | typedef unsigned long hva_t; |
| 39 | typedef u64 hpa_t; | 41 | typedef u64 hpa_t; |
| 40 | typedef u64 hfn_t; | 42 | typedef u64 hfn_t; |