diff mbox series

x86/kvm: Don't waste memory if kvmclock is disabled

Message ID 1645520523-30814-1-git-send-email-wanpengli@tencent.com (mailing list archive)
State New, archived
Headers show
Series x86/kvm: Don't waste memory if kvmclock is disabled | expand

Commit Message

Wanpeng Li Feb. 22, 2022, 9:02 a.m. UTC 
From: Wanpeng Li <wanpengli@tencent.com>

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>
---
 arch/x86/kernel/kvmclock.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

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