Commit a75b3e0f authored by Liu, Jinsong's avatar Liu, Jinsong Committed by Marcelo Tosatti
Browse files

kvm: expose tsc deadline timer feature to guest 



This patch exposes tsc deadline timer feature to guest if
1). in-kernel irqchip is used, and
2). kvm has emulated tsc deadline timer, and
3). user authorize the feature exposing via -cpu or +/- tsc-deadline

Signed-off-by: default avatarLiu, Jinsong <jinsong.liu@intel.com>
Reviewed-by: default avatarEduardo Habkost <ehabkost@redhat.com>
Acked-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent bfee7546

target-i386/cpu.h

+1 −0
Original line number Diff line number Diff line
@@ -400,6 +400,7 @@ 
#define CPUID_EXT_X2APIC   (1 << 21)

#define CPUID_EXT_MOVBE    (1 << 22)

#define CPUID_EXT_POPCNT   (1 << 23)

#define CPUID_EXT_TSC_DEADLINE_TIMER (1 << 24)

#define CPUID_EXT_XSAVE    (1 << 26)

#define CPUID_EXT_OSXSAVE  (1 << 27)

#define CPUID_EXT_HYPERVISOR  (1 << 31)

target-i386/kvm.c

+5 −0
Original line number Diff line number Diff line
@@ -361,8 +361,13 @@ int kvm_arch_init_vcpu(CPUX86State *env) 
    env->cpuid_features &= kvm_arch_get_supported_cpuid(s, 1, 0, R_EDX);



    i = env->cpuid_ext_features & CPUID_EXT_HYPERVISOR;

    j = env->cpuid_ext_features & CPUID_EXT_TSC_DEADLINE_TIMER;

    env->cpuid_ext_features &= kvm_arch_get_supported_cpuid(s, 1, 0, R_ECX);

    env->cpuid_ext_features |= i;

    if (j && kvm_irqchip_in_kernel() &&

        kvm_check_extension(s, KVM_CAP_TSC_DEADLINE_TIMER)) {

        env->cpuid_ext_features |= CPUID_EXT_TSC_DEADLINE_TIMER;

    }



    env->cpuid_ext2_features &= kvm_arch_get_supported_cpuid(s, 0x80000001,

                                                             0, R_EDX);