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x86/timers: Move simple_udelay_calibration() past kvmclock_init() 

simple_udelay_calibration() relies on x86_platform's calibration ops.
For KVM these ops are set late in setup_arch() and so
simple_udelay_calibration() ends up using native version.

Besides being possibly incorrect, this significantly increases kernel
boot time. For example, on my laptop executing start_kernel() by a guest
takes ~10 times more than when KVM's ops are used.

Since early_xdbc_setup_hardware() relies on calibration having been
performed move it too.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: baolu.lu@linux.intel.com
Link: https://lkml.kernel.org/r/20170911185111.20636-1-boris.ostrovsky@oracle.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Boris Ostrovsky 2017-09-11 14:51:11 -04:00 committed by Thomas Gleixner
parent af5768507c
commit ccb64941f3
1 changed files with 4 additions and 5 deletions
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9
arch/x86/kernel/setup.c
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@ -1029,8 +1029,6 @@ void __init setup_arch(char **cmdline_p)
*/
init_hypervisor_platform();
tsc_early_delay_calibrate();
x86_init.resources.probe_roms();
/* after parse_early_param, so could debug it */
@ -1115,9 +1113,6 @@ void __init setup_arch(char **cmdline_p)
memblock_set_current_limit(ISA_END_ADDRESS);
e820__memblock_setup();
if (!early_xdbc_setup_hardware())
early_xdbc_register_console();
reserve_bios_regions();
if (efi_enabled(EFI_MEMMAP)) {
@ -1223,6 +1218,10 @@ void __init setup_arch(char **cmdline_p)
kvmclock_init();
#endif
tsc_early_delay_calibrate();
if (!early_xdbc_setup_hardware())
early_xdbc_register_console();
x86_init.paging.pagetable_init();
kasan_init();