diff options
| author | Oliver Upton <oupton@google.com> | 2020-08-18 18:24:26 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-10-22 00:36:31 +0300 |
| commit | 5b9bb0ebbcdcf8d04bf44a1e73e23a89a6711f31 (patch) | |
| tree | 291a4047b58038c00eaa9b236a637862e488f306 /arch/x86 | |
| parent | 66af4f5cb1ee44c41a8433877c859d4b3f922f83 (diff) | |
| download | linux-5b9bb0ebbcdcf8d04bf44a1e73e23a89a6711f31.tar.xz | |
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/x86')
| -rw-r--r-- | arch/x86/kvm/x86.c | 58 |
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; |