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| author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-09-11 14:51:11 -0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-09-25 15:22:45 +0200 |
| commit | ccb64941f375a6eb21b1b20136730eb7d1716068 (patch) | |
| tree | 7a2a352e6fb02667f4219438e7ea919a04a521da /arch | |
| parent | af5768507c051ceb9fe12bee59202bd83115c073 (diff) | |
| download | linux-ccb64941f375a6eb21b1b20136730eb7d1716068.tar.gz linux-ccb64941f375a6eb21b1b20136730eb7d1716068.tar.bz2 linux-ccb64941f375a6eb21b1b20136730eb7d1716068.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/setup.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index c63d2b4dd5c8..b40311027c15 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -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(); |