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KVM: x86/xen: Add KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID

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In order to intercept hypercalls such as VCPUOP_set_singleshot_timer, we
need to be aware of the Xen CPU numbering.

This looks a lot like the Hyper-V handling of vpidx, for obvious reasons.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220303154127.202856-12-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Woodhouse 2022-03-03 15:41:21 +00:00 committed by Paolo Bonzini
parent 0ec6c5c5bb
commit 942c2490c2
5 changed files with 29 additions and 0 deletions
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1
arch/x86/include/asm/kvm_host.h
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@ -613,6 +613,7 @@ struct kvm_vcpu_xen {
u64 runstate_entry_time;
u64 runstate_times[4];
unsigned long evtchn_pending_sel;
u32 vcpu_id; /* The Xen / ACPI vCPU ID */
};
struct kvm_vcpu_arch {

1
arch/x86/kvm/x86.c
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@ -11262,6 +11262,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
vcpu->arch.arch_capabilities = kvm_get_arch_capabilities();
vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT;
kvm_xen_init_vcpu(vcpu);
kvm_vcpu_mtrr_init(vcpu);
vcpu_load(vcpu);
kvm_set_tsc_khz(vcpu, max_tsc_khz);

19
arch/x86/kvm/xen.c
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@ -603,6 +603,15 @@ int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data)
r = 0;
break;
case KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID:
if (data->u.vcpu_id >= KVM_MAX_VCPUS)
r = -EINVAL;
else {
vcpu->arch.xen.vcpu_id = data->u.vcpu_id;
r = 0;
}
break;
default:
break;
}
@ -678,6 +687,11 @@ int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data)
r = -EINVAL;
break;
case KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID:
data->u.vcpu_id = vcpu->arch.xen.vcpu_id;
r = 0;
break;
default:
break;
}
@ -1377,6 +1391,11 @@ static bool kvm_xen_hcall_evtchn_send(struct kvm_vcpu *vcpu, u64 param, u64 *r)
return true;
}
void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu)
{
vcpu->arch.xen.vcpu_id = vcpu->vcpu_idx;
}
void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu)
{
kvm_gfn_to_pfn_cache_destroy(vcpu->kvm,

5
arch/x86/kvm/xen.h
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@ -25,6 +25,7 @@ int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data);
int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc);
void kvm_xen_init_vm(struct kvm *kvm);
void kvm_xen_destroy_vm(struct kvm *kvm);
void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu);
void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu);
int kvm_xen_set_evtchn_fast(struct kvm_xen_evtchn *xe,
struct kvm *kvm);
@ -75,6 +76,10 @@ static inline void kvm_xen_destroy_vm(struct kvm *kvm)
{
}
static inline void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu)
{
}
static inline void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu)
{
}

3
include/uapi/linux/kvm.h
View File

@ -1747,6 +1747,7 @@ struct kvm_xen_vcpu_attr {
__u64 time_blocked;
__u64 time_offline;
} runstate;
__u32 vcpu_id;
} u;
};
@ -1757,6 +1758,8 @@ struct kvm_xen_vcpu_attr {
#define KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT 0x3
#define KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA 0x4
#define KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST 0x5
/* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_EVTCHN_SEND */
#define KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID 0x6
/* Secure Encrypted Virtualization command */
enum sev_cmd_id {