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i386/cpu: Store LAPIC bus frequency in CPU structure 

No functional change.
This information will be used by following patches.

Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <20200312165431.82118-15-liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Liran Alon 2020-03-12 18:54:29 +02:00 committed by Paolo Bonzini
parent 7f9114b77c
commit 73b994f6d7
2 changed files with 8 additions and 3 deletions
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1
target/i386/cpu.h
View File

@ -1584,6 +1584,7 @@ typedef struct CPUX86State {
bool tsc_valid;
int64_t tsc_khz;
int64_t user_tsc_khz; /* for sanity check only */
uint64_t apic_bus_freq;
#if defined(CONFIG_KVM) || defined(CONFIG_HVF)
void *xsave_buf;
#endif

10
target/i386/kvm.c
View File

@ -59,6 +59,10 @@
do { } while (0)
#endif
/* From arch/x86/kvm/lapic.h */
#define KVM_APIC_BUS_CYCLE_NS 1
#define KVM_APIC_BUS_FREQUENCY (1000000000ULL / KVM_APIC_BUS_CYCLE_NS)
#define MSR_KVM_WALL_CLOCK 0x11
#define MSR_KVM_SYSTEM_TIME 0x12
@ -1469,6 +1473,8 @@ int kvm_arch_init_vcpu(CPUState *cs)
}
}
env->apic_bus_freq = KVM_APIC_BUS_FREQUENCY;
/* Paravirtualization CPUIDs */
r = hyperv_handle_properties(cs, cpuid_data.entries);
if (r < 0) {
@ -1773,9 +1779,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
c = &cpuid_data.entries[cpuid_i++];
c->function = KVM_CPUID_SIGNATURE | 0x10;
c->eax = env->tsc_khz;
/* LAPIC resolution of 1ns (freq: 1GHz) is hardcoded in KVM's
* APIC_BUS_CYCLE_NS */
c->ebx = 1000000;
c->ebx = env->apic_bus_freq / 1000; /* Hz to KHz */
c->ecx = c->edx = 0;
c = cpuid_find_entry(&cpuid_data.cpuid, kvm_base, 0);