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c68dc1b577
linux/arch/x86/kvm
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Oliver Upton c68dc1b577 KVM: x86: Report host tsc and realtime values in KVM_GET_CLOCK 
Handling the migration of TSCs correctly is difficult, in part because
Linux does not provide userspace with the ability to retrieve a (TSC,
realtime) clock pair for a single instant in time. In lieu of a more
convenient facility, KVM can report similar information in the kvm_clock
structure.

Provide userspace with a host TSC & realtime pair iff the realtime clock
is based on the TSC. If userspace provides KVM_SET_CLOCK with a valid
realtime value, advance the KVM clock by the amount of elapsed time. Do
not step the KVM clock backwards, though, as it is a monotonic
oscillator.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210916181538.968978-5-oupton@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-10-18 14:43:44 -04:00
..
mmu KVM: x86: avoid warning with -Wbitwise-instead-of-logical 2021-10-18 14:43:42 -04:00
svm Merge commit 'kvm-pagedata-alloc-fixes' into HEAD 2021-10-18 14:13:37 -04:00
vmx KVM: x86: nSVM: implement nested TSC scaling 2021-10-01 03:44:46 -04:00
cpuid.c KVM: x86: Expose Predictive Store Forwarding Disable 2021-10-01 03:44:57 -04:00
cpuid.h KVM: x86: Move reverse CPUID helpers to separate header file 2021-04-26 05:27:13 -04:00
debugfs.c KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file 2021-08-20 16:06:11 -04:00
emulate.c kvm: fix wrong exception emulation in check_rdtsc 2021-09-22 10:33:11 -04:00
fpu.h KVM: x86: Move FPU register accessors into fpu.h 2021-06-17 13:09:24 -04:00
hyperv.c KVM: Make kvm_make_vcpus_request_mask() use pre-allocated cpu_kick_mask 2021-09-30 04:27:04 -04:00
hyperv.h KVM: x86: Query vcpu->vcpu_idx directly and drop its accessor 2021-09-22 10:33:11 -04:00
i8254.c KVM: x86: Migrate the PIT only if vcpu0 is migrated, not any BSP 2021-08-02 11:01:51 -04:00
i8254.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
i8259.c x86: Fix typo s/ECLR/ELCR/ for the PIC register 2021-08-10 23:31:44 +02:00
ioapic.c kvm: rename KVM_MAX_VCPU_ID to KVM_MAX_VCPU_IDS 2021-09-30 04:27:05 -04:00
ioapic.h kvm: rename KVM_MAX_VCPU_ID to KVM_MAX_VCPU_IDS 2021-09-30 04:27:05 -04:00
irq_comm.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
irq.c KVM: x86/xen: Add event channel interrupt vector upcall 2021-02-04 14:19:39 +00:00
irq.h x86: Fix typo s/ECLR/ELCR/ for the PIC register 2021-08-10 23:31:44 +02:00
Kconfig KVM: x86: add config for non-kvm users of page tracking 2021-10-01 03:44:57 -04:00
kvm_cache_regs.h KVM: x86: Introduce KVM_GET_SREGS2 / KVM_SET_SREGS2 2021-06-17 13:09:47 -04:00
kvm_emulate.h KVM: x86: Drop "pre_" from enter/leave_smm() helpers 2021-06-17 13:09:35 -04:00
kvm_onhyperv.c KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx 2021-06-17 13:09:36 -04:00
kvm_onhyperv.h KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx 2021-06-17 13:09:36 -04:00
lapic.c KVM: x86: Consolidate APIC base RESET initialization code 2021-08-02 11:01:52 -04:00
lapic.h KVM: x86: Add a return code to kvm_apic_accept_events 2021-06-17 13:09:31 -04:00
Makefile KVM: stats: Add fd-based API to read binary stats data 2021-06-24 11:47:57 -04:00
mmu.h KVM: x86/mmu: Pass the memslot around via struct kvm_page_fault 2021-10-01 03:44:53 -04:00
mtrr.c KVM: x86: Add helper to consolidate "raw" reserved GPA mask calculations 2021-02-04 09:27:30 -05:00
pmu.c KVM: x86/pmu: Introduce pmc->is_paused to reduce the call time of perf interfaces 2021-08-04 05:55:56 -04:00
pmu.h KVM: x86/pmu: Introduce pmc->is_paused to reduce the call time of perf interfaces 2021-08-04 05:55:56 -04:00
reverse_cpuid.h KVM: SEV: Mask CPUID[0x8000001F].eax according to supported features 2021-04-26 05:27:15 -04:00
trace.h KVM: x86: Introduce trace_kvm_hv_hypercall_done() 2021-08-03 06:16:40 -04:00
tss.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
x86.c KVM: x86: Report host tsc and realtime values in KVM_GET_CLOCK 2021-10-18 14:43:44 -04:00
x86.h KVM: x86: Move declaration of kvm_spurious_fault() to x86.h 2021-08-13 03:35:16 -04:00
xen.c KVM: xen: do not use struct gfn_to_hva_cache 2021-08-05 03:31:40 -04:00
xen.h KVM: xen: do not use struct gfn_to_hva_cache 2021-08-05 03:31:40 -04:00