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x86/acrn: Set up timekeeping

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ACRN Hypervisor reports timing information via CPUID leaf 0x40000010.
Get the TSC and CPU frequency via CPUID leaf 0x40000010 and set the
kernel values accordingly.

Signed-off-by: Fei Li <fei1.li@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Conghui <conghui.chen@intel.com>
Link: https://lore.kernel.org/r/20220804055903.365211-1-fei1.li@intel.com
This commit is contained in:
Fei Li 2022-08-04 13:59:03 +08:00 committed by Ingo Molnar
parent 9de1f9c8ca
commit 81a71f51b8
2 changed files with 17 additions and 0 deletions
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14
arch/x86/include/asm/acrn.h
View File

@ -10,6 +10,15 @@
/* Bit 0 indicates whether guest VM is privileged */
#define ACRN_FEATURE_PRIVILEGED_VM BIT(0)
/*
* Timing Information.
* This leaf returns the current TSC frequency in kHz.
*
* EAX: (Virtual) TSC frequency in kHz.
* EBX, ECX, EDX: RESERVED (reserved fields are set to zero).
*/
#define ACRN_CPUID_TIMING_INFO 0x40000010
void acrn_setup_intr_handler(void (*handler)(void));
void acrn_remove_intr_handler(void);
@ -21,6 +30,11 @@ static inline u32 acrn_cpuid_base(void)
return 0;
}
static inline unsigned long acrn_get_tsc_khz(void)
{
return cpuid_eax(ACRN_CPUID_TIMING_INFO);
}
/*
* Hypercalls for ACRN
*

3
arch/x86/kernel/cpu/acrn.c
View File

@ -28,6 +28,9 @@ static void __init acrn_init_platform(void)
{
/* Setup the IDT for ACRN hypervisor callback */
alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_acrn_hv_callback);
x86_platform.calibrate_tsc = acrn_get_tsc_khz;
x86_platform.calibrate_cpu = acrn_get_tsc_khz;
}
static bool acrn_x2apic_available(void)