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KVM: x86/xen: setup pvclock updates 

Parameterise kvm_setup_pvclock_page() a little bit so that it can be
invoked for different gfn_to_hva_cache structures, and with different
offsets. Then we can invoke it for the normal KVM pvclock and also for
the Xen one in the vcpu_info.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
This commit is contained in:
Joao Martins 2019-02-01 13:01:45 -05:00 committed by David Woodhouse
parent 73e69a8634
commit aa096aa0a0
2 changed files with 21 additions and 15 deletions
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31
arch/x86/kvm/x86.c
View File

@ -2610,13 +2610,15 @@ u64 get_kvmclock_ns(struct kvm *kvm)
return ret;
}
static void kvm_setup_pvclock_page(struct kvm_vcpu *v)
static void kvm_setup_pvclock_page(struct kvm_vcpu *v,
struct gfn_to_hva_cache *cache,
unsigned int offset)
{
struct kvm_vcpu_arch *vcpu = &v->arch;
struct pvclock_vcpu_time_info guest_hv_clock;
if (unlikely(kvm_read_guest_cached(v->kvm, &vcpu->pv_time,
&guest_hv_clock, sizeof(guest_hv_clock))))
if (unlikely(kvm_read_guest_offset_cached(v->kvm, cache,
&guest_hv_clock, offset, sizeof(guest_hv_clock))))
return;
/* This VCPU is paused, but it's legal for a guest to read another
@ -2639,9 +2641,9 @@ static void kvm_setup_pvclock_page(struct kvm_vcpu *v)
++guest_hv_clock.version; /* first time write, random junk */
vcpu->hv_clock.version = guest_hv_clock.version + 1;
kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
&vcpu->hv_clock,
sizeof(vcpu->hv_clock.version));
kvm_write_guest_offset_cached(v->kvm, cache,
&vcpu->hv_clock, offset,
sizeof(vcpu->hv_clock.version));
smp_wmb();
@ -2655,16 +2657,16 @@ static void kvm_setup_pvclock_page(struct kvm_vcpu *v)
trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock);
kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
&vcpu->hv_clock,
sizeof(vcpu->hv_clock));
kvm_write_guest_offset_cached(v->kvm, cache,
&vcpu->hv_clock, offset,
sizeof(vcpu->hv_clock));
smp_wmb();
vcpu->hv_clock.version++;
kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
&vcpu->hv_clock,
sizeof(vcpu->hv_clock.version));
kvm_write_guest_offset_cached(v->kvm, cache,
&vcpu->hv_clock, offset,
sizeof(vcpu->hv_clock.version));
}
static int kvm_guest_time_update(struct kvm_vcpu *v)
@ -2751,7 +2753,10 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
vcpu->hv_clock.flags = pvclock_flags;
if (vcpu->pv_time_enabled)
kvm_setup_pvclock_page(v);
kvm_setup_pvclock_page(v, &vcpu->pv_time, 0);
if (vcpu->xen.vcpu_info_set)
kvm_setup_pvclock_page(v, &vcpu->xen.vcpu_info_cache,
offsetof(struct compat_vcpu_info, time));
if (v == kvm_get_vcpu(v->kvm, 0))
kvm_hv_setup_tsc_page(v->kvm, &vcpu->hv_clock);
return 0;

5
arch/x86/kvm/xen.c
View File

@ -135,11 +135,12 @@ int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data)
&vcpu->arch.xen.vcpu_info_cache,
data->u.gpa,
sizeof(struct vcpu_info));
if (!r)
if (!r) {
vcpu->arch.xen.vcpu_info_set = true;
kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
}
break;
default:
break;
}