lkml.org 
[lkml]   [2023]   [Nov]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[RFC 09/33] KVM: x86: hyper-v: Introduce per-VTL vcpu helpers
    Date
    Introduce two helper functions. The first one queries a vCPU's VTL
    level, the second one, given a struct kvm_vcpu and VTL pair, returns the
    corresponding 'sibling' struct kvm_vcpu at the right VTL.

    We keep track of each VTL's state by having a distinct struct kvm_vpcu
    for each level. VTL-vCPUs that belong to the same guest CPU share the
    same physical APIC id, but belong to different APIC groups where the
    apic group represents the vCPU's VTL.

    Signed-off-by: Nicolas Saenz Julienne <nsaenz@amazon.com>
    ---
    arch/x86/kvm/hyperv.h | 18 ++++++++++++++++++
    1 file changed, 18 insertions(+)

    diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
    index 2bfed69ba0db..5433107e7cc8 100644
    --- a/arch/x86/kvm/hyperv.h
    +++ b/arch/x86/kvm/hyperv.h
    @@ -23,6 +23,7 @@

    #include <linux/kvm_host.h>
    #include "x86.h"
    +#include "lapic.h"

    /* "Hv#1" signature */
    #define HYPERV_CPUID_SIGNATURE_EAX 0x31237648
    @@ -83,6 +84,23 @@ static inline struct kvm_hv_syndbg *to_hv_syndbg(struct kvm_vcpu *vcpu)
    return &vcpu->kvm->arch.hyperv.hv_syndbg;
    }

    +static inline struct kvm_vcpu *kvm_hv_get_vtl_vcpu(struct kvm_vcpu *vcpu, int vtl)
    +{
    + struct kvm *kvm = vcpu->kvm;
    + u32 target_id = kvm_apic_id(vcpu);
    +
    + kvm_apic_id_set_group(kvm, vtl, &target_id);
    + if (vcpu->vcpu_id == target_id)
    + return vcpu;
    +
    + return kvm_get_vcpu_by_id(kvm, target_id);
    +}
    +
    +static inline u8 kvm_hv_get_active_vtl(struct kvm_vcpu *vcpu)
    +{
    + return kvm_apic_group(vcpu);
    +}
    +
    static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu)
    {
    struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
    --
    2.40.1
    \
     
     \ /
      Last update: 2023-11-20 13:52    [W:3.560 / U:0.944 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site