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nova: support transfer of IA32_TSC_AUX MSR for vCPUs

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The 32-bit MSR is returned by rdtscp in ecx register and used to detect
the CPU ID the timestamp was taken on.

Issue #4314
This commit is contained in:
Alexander Boettcher
2021-11-02 14:59:15 +01:00
committed by Christian Helmuth
parent f4e52863c0
commit 533015b93e
8 changed files with 105 additions and 29 deletions
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10
repos/base-nova/src/lib/base/vm.cc
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@ -135,6 +135,7 @@ struct Nova_vcpu : Rpc_client<Vm_session::Native_vcpu>, Noncopyable
mtd |= Nova::Mtd::INJ;
mtd |= Nova::Mtd::STA;
mtd |= Nova::Mtd::TSC;
mtd |= Nova::Mtd::TSC_AUX;
mtd |= Nova::Mtd::EFER;
mtd |= Nova::Mtd::PDPTE;
mtd |= Nova::Mtd::SYSCALL_SWAPGS;
@ -316,6 +317,10 @@ void Nova_vcpu::_read_nova_state(Nova::Utcb &utcb, unsigned exit_reason,
state().tsc_offset.charge(utcb.tsc_off);
}
if (utcb.mtd & Nova::Mtd::TSC_AUX) {
state().tsc_aux.charge(utcb.tsc_aux);
}
if (utcb.mtd & Nova::Mtd::EFER) {
state().efer.charge(utcb.read_efer());
}
@ -508,6 +513,11 @@ void Nova_vcpu::_write_nova_state(Nova::Utcb &utcb)
utcb.tsc_off = state().tsc_offset.value();
}
if (state().tsc_aux.charged()) {
utcb.mtd |= Nova::Mtd::TSC_AUX;
utcb.tsc_aux = state().tsc_aux.value();
}
if (state().efer.charged()) {
utcb.mtd |= Nova::Mtd::EFER;
utcb.write_efer(state().efer.value());