On 11/5/2024 7:52 AM, Sean Christopherson wrote:
> On Sun, Nov 03, 2024, Manali Shukla wrote:
>> On 10/15/2024 11:19 PM, Sean Christopherson wrote:
>>> On Fri, Oct 04, 2024, Manali Shukla wrote:
>> ...
+static int bus_lock_exit(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_svm *svm
On Sun, Nov 03, 2024, Manali Shukla wrote:
> On 10/15/2024 11:19 PM, Sean Christopherson wrote:
> > On Fri, Oct 04, 2024, Manali Shukla wrote:
> ...
> >>
> >> +static int bus_lock_exit(struct kvm_vcpu *vcpu)
> >> +{
> >> + struct vcpu_svm *svm = to_svm(vcpu);
> >> +
> >> + vcpu->run->exit_reaso
On 10/15/2024 11:19 PM, Sean Christopherson wrote:
> On Fri, Oct 04, 2024, Manali Shukla wrote:
...
>>
>> +static int bus_lock_exit(struct kvm_vcpu *vcpu)
>> +{
>> +struct vcpu_svm *svm = to_svm(vcpu);
>> +
>> +vcpu->run->exit_reason = KVM_EXIT_X86_BUS_LOCK;
>> +vcpu->run->flags |= KV
Hi Sean,
Thanks for reviewing my patches.
On 10/15/2024 11:19 PM, Sean Christopherson wrote:
> On Fri, Oct 04, 2024, Manali Shukla wrote:
>> When a VMRUN instruction is executed, the bus lock threshold count is
>> loaded into an internal count register. Before the processor executes
>> a bus lock
On Fri, Oct 04, 2024, Manali Shukla wrote:
> When a VMRUN instruction is executed, the bus lock threshold count is
> loaded into an internal count register. Before the processor executes
> a bus lock in the guest, it checks the value of this register:
>
> - If the value is greater than '0', the p
From: Nikunj A Dadhania
Virtual machines can exploit bus locks to degrade the performance of
the system. Bus locks can be caused by Non-WB(Write back) and
misaligned locked RMW (Read-modify-Write) instructions and require
systemwide synchronization among all processors which can result into
signi
