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authorOliver Upton <oupton@google.com>2020-08-18 15:24:26 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2020-10-21 17:36:31 -0400
commit5b9bb0ebbcdcf8d04bf44a1e73e23a89a6711f31 (patch)
tree291a4047b58038c00eaa9b236a637862e488f306 /arch
parent66af4f5cb1ee44c41a8433877c859d4b3f922f83 (diff)
kvm: x86: encapsulate wrmsr(MSR_KVM_SYSTEM_TIME) emulation in helper fn
No functional change intended. Reviewed-by: Jim Mattson <jmattson@google.com> Reviewed-by: Peter Shier <pshier@google.com> Reviewed-by: Wanpeng Li <wanpengli@tencent.com> Signed-off-by: Oliver Upton <oupton@google.com> Change-Id: I7cbe71069db98d1ded612fd2ef088b70e7618426 Message-Id: <20200818152429.1923996-2-oupton@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/x86.c58
1 files changed, 32 insertions, 26 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0f02d0fe3abb..a70733d2abf0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1948,6 +1948,34 @@ static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
}
+static void kvm_write_system_time(struct kvm_vcpu *vcpu, gpa_t system_time,
+ bool old_msr, bool host_initiated)
+{
+ struct kvm_arch *ka = &vcpu->kvm->arch;
+
+ if (vcpu->vcpu_id == 0 && !host_initiated) {
+ if (ka->boot_vcpu_runs_old_kvmclock && old_msr)
+ kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
+
+ ka->boot_vcpu_runs_old_kvmclock = old_msr;
+ }
+
+ vcpu->arch.time = system_time;
+ kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
+
+ /* we verify if the enable bit is set... */
+ vcpu->arch.pv_time_enabled = false;
+ if (!(system_time & 1))
+ return;
+
+ if (!kvm_gfn_to_hva_cache_init(vcpu->kvm,
+ &vcpu->arch.pv_time, system_time & ~1ULL,
+ sizeof(struct pvclock_vcpu_time_info)))
+ vcpu->arch.pv_time_enabled = true;
+
+ return;
+}
+
static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
{
do_shl32_div32(dividend, divisor);
@@ -3093,33 +3121,11 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
kvm_write_wall_clock(vcpu->kvm, data);
break;
case MSR_KVM_SYSTEM_TIME_NEW:
- case MSR_KVM_SYSTEM_TIME: {
- struct kvm_arch *ka = &vcpu->kvm->arch;
-
- if (vcpu->vcpu_id == 0 && !msr_info->host_initiated) {
- bool tmp = (msr == MSR_KVM_SYSTEM_TIME);
-
- if (ka->boot_vcpu_runs_old_kvmclock != tmp)
- kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
-
- ka->boot_vcpu_runs_old_kvmclock = tmp;
- }
-
- vcpu->arch.time = data;
- kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
-
- /* we verify if the enable bit is set... */
- vcpu->arch.pv_time_enabled = false;
- if (!(data & 1))
- break;
-
- if (!kvm_gfn_to_hva_cache_init(vcpu->kvm,
- &vcpu->arch.pv_time, data & ~1ULL,
- sizeof(struct pvclock_vcpu_time_info)))
- vcpu->arch.pv_time_enabled = true;
-
+ kvm_write_system_time(vcpu, data, false, msr_info->host_initiated);
+ break;
+ case MSR_KVM_SYSTEM_TIME:
+ kvm_write_system_time(vcpu, data, true, msr_info->host_initiated);
break;
- }
case MSR_KVM_ASYNC_PF_EN:
if (kvm_pv_enable_async_pf(vcpu, data))
return 1;