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| author |  Wanpeng Li <wanpengli@tencent.com>
| 2022-02-22 01:02:03 -0800 |
|---|---|---|
| committer |  Paolo Bonzini <pbonzini@redhat.com>
| 2022-02-25 10:09:34 -0500 |
| commit | 3c51d0a6c761c2025c6db1ed4d3a7273167bf899 (patch) | |
| tree | 8810288e3d48c3a5997391d3840d05f05ee1a94e /arch/x86/kernel/kvmclock.c | |
| parent | x86/kvm: Don't use PV TLB/yield when mwait is advertised (diff) | |
| download | linux-3c51d0a6c761c2025c6db1ed4d3a7273167bf899.tar.gz linux-3c51d0a6c761c2025c6db1ed4d3a7273167bf899.tar.bz2 linux-3c51d0a6c761c2025c6db1ed4d3a7273167bf899.zip | |
x86/kvm: Don't waste memory if kvmclock is disabled
Even if "no-kvmclock" is passed in cmdline parameter, the guest kernel
still allocates hvclock_mem which is scaled by the number of vCPUs,
let's check kvmclock enable in advance to avoid this memory waste.
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1645520523-30814-1-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kernel/kvmclock.c')
| -rw-r--r-- | arch/x86/kernel/kvmclock.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c index a35cbf9107af..44ed677d401f 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -239,6 +239,9 @@ static void __init kvmclock_init_mem(void) static int __init kvm_setup_vsyscall_timeinfo(void) { + if (!kvmclock) + return 0; + kvmclock_init_mem(); #ifdef CONFIG_X86_64 |