KVM: x86: don't print when fail to read/write pv eoi memory

If guest gives MSR_KVM_PV_EOI_EN a wrong value, this printk() will
be trigged, and kernel log is spammed with the useless message

Fixes: 0d88800d5472 ("kvm: x86: ioapic and apic debug macros cleanup")
Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Cc: stable@kernel.org
Message-Id: <1636026974-50555-1-git-send-email-lirongqing@baidu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index bbac847..8f4d872 100644 (file)
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -676,31 +676,25 @@ static inline bool pv_eoi_enabled(struct kvm_vcpu *vcpu)
 static bool pv_eoi_get_pending(struct kvm_vcpu *vcpu)
 {
        u8 val;
-       if (pv_eoi_get_user(vcpu, &val) < 0) {
-               printk(KERN_WARNING "Can't read EOI MSR value: 0x%llx\n",
-                          (unsigned long long)vcpu->arch.pv_eoi.msr_val);
+       if (pv_eoi_get_user(vcpu, &val) < 0)
                return false;
-       }
+
        return val & KVM_PV_EOI_ENABLED;
 }
 
 static void pv_eoi_set_pending(struct kvm_vcpu *vcpu)
 {
-       if (pv_eoi_put_user(vcpu, KVM_PV_EOI_ENABLED) < 0) {
-               printk(KERN_WARNING "Can't set EOI MSR value: 0x%llx\n",
-                          (unsigned long long)vcpu->arch.pv_eoi.msr_val);
+       if (pv_eoi_put_user(vcpu, KVM_PV_EOI_ENABLED) < 0)
                return;
-       }
+
        __set_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
 }
 
 static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
 {
-       if (pv_eoi_put_user(vcpu, KVM_PV_EOI_DISABLED) < 0) {
-               printk(KERN_WARNING "Can't clear EOI MSR value: 0x%llx\n",
-                          (unsigned long long)vcpu->arch.pv_eoi.msr_val);
+       if (pv_eoi_put_user(vcpu, KVM_PV_EOI_DISABLED) < 0)
                return;
-       }
+
        __clear_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
 }