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clocksource: hyper-v: Use lapic timer in a TDX VM without paravisor

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In a TDX VM without paravisor, currently the default timer is the Hyper-V
timer, which depends on the slow VM Reference Counter MSR: the Hyper-V TSC
page is not enabled in such a VM because the VM uses Invariant TSC as a
better clocksource and it's challenging to mark the Hyper-V TSC page shared
in very early boot.

Lower the rating of the Hyper-V timer so the local APIC timer becomes the
the default timer in such a VM, and print a warning in case Invariant TSC
is unavailable in such a VM. This change should cause no perceivable
performance difference.

Cc: stable@vger.kernel.org # 6.6+
Reviewed-by: Roman Kisel <romank@linux.microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/20240621061614.8339-1-decui@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20240621061614.8339-1-decui@microsoft.com>
This commit is contained in:
Dexuan Cui 2024-06-20 23:16:14 -07:00 committed by Wei Liu
parent 90ac806c32
commit 7f828d5fff
2 changed files with 30 additions and 2 deletions
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16
arch/x86/kernel/cpu/mshyperv.c
View File

@ -449,9 +449,23 @@ static void __init ms_hyperv_init_platform(void)
ms_hyperv.hints &= ~HV_X64_APIC_ACCESS_RECOMMENDED;
if (!ms_hyperv.paravisor_present) {
/* To be supported: more work is required. */
/*
* Mark the Hyper-V TSC page feature as disabled
* in a TDX VM without paravisor so that the
* Invariant TSC, which is a better clocksource
* anyway, is used instead.
*/
ms_hyperv.features &= ~HV_MSR_REFERENCE_TSC_AVAILABLE;
/*
* The Invariant TSC is expected to be available
* in a TDX VM without paravisor, but if not,
* print a warning message. The slower Hyper-V MSR-based
* Ref Counter should end up being the clocksource.
*/
if (!(ms_hyperv.features & HV_ACCESS_TSC_INVARIANT))
pr_warn("Hyper-V: Invariant TSC is unavailable\n");
/* HV_MSR_CRASH_CTL is unsupported. */
ms_hyperv.misc_features &= ~HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE;

14
drivers/clocksource/hyperv_timer.c
View File

@ -137,7 +137,21 @@ static int hv_stimer_init(unsigned int cpu)
ce->name = "Hyper-V clockevent";
ce->features = CLOCK_EVT_FEAT_ONESHOT;
ce->cpumask = cpumask_of(cpu);
/*
* Lower the rating of the Hyper-V timer in a TDX VM without paravisor,
* so the local APIC timer (lapic_clockevent) is the default timer in
* such a VM. The Hyper-V timer is not preferred in such a VM because
* it depends on the slow VM Reference Counter MSR (the Hyper-V TSC
* page is not enbled in such a VM because the VM uses Invariant TSC
* as a better clocksource and it's challenging to mark the Hyper-V
* TSC page shared in very early boot).
*/
if (!ms_hyperv.paravisor_present && hv_isolation_type_tdx())
ce->rating = 90;
else
ce->rating = 1000;
ce->set_state_shutdown = hv_ce_shutdown;
ce->set_state_oneshot = hv_ce_set_oneshot;
ce->set_next_event = hv_ce_set_next_event;