linux-kernel - Re: [PATCH v6 7/7] KVM: selftests: Add test for user space MSR handling

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Message-ID: <CAAAPnDGC8ED=aky=vjaQf6=pv9kKXHbB8m-uEsuzhxgSN0oZZw@mail.gmail.com>
Date:   Thu, 3 Sep 2020 12:31:43 -0700
From:   Aaron Lewis <aaronlewis@...gle.com>
To:     Alexander Graf <graf@...zon.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        KarimAllah Raslan <karahmed@...zon.de>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        kvm list <kvm@...r.kernel.org>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 7/7] KVM: selftests: Add test for user space MSR handling

> +static void handle_rdmsr(struct kvm_run *run)
> +{
> +       run->msr.data = run->msr.index;
> +       msr_reads++;
> +
> +       if (run->msr.index == MSR_SYSCALL_MASK ||
> +           run->msr.index == MSR_GS_BASE) {
> +               TEST_ASSERT(run->msr.reason != KVM_MSR_EXIT_REASON_FILTER,

TEST_ASSERT(run->msr.reason == KVM_MSR_EXIT_REASON_FILTER,

> +                           "MSR read trap w/o access fault");
> +       }
> +}
> +
> +static void handle_wrmsr(struct kvm_run *run)
> +{
> +       /* ignore */
> +       msr_writes++;
> +
> +       if (run->msr.index == MSR_IA32_POWER_CTL) {
> +               TEST_ASSERT(run->msr.data != 0x1234,

TEST_ASSERT(run->msr.data == 0x1234,

> +                           "MSR data for MSR_IA32_POWER_CTL incorrect");
> +               TEST_ASSERT(run->msr.reason != KVM_MSR_EXIT_REASON_FILTER,

TEST_ASSERT(run->msr.reason == KVM_MSR_EXIT_REASON_FILTER,

> +                           "MSR_IA32_POWER_CTL trap w/o access fault");
> +       }
> +}
> +
> +int main(int argc, char *argv[])
> +{
> +       struct kvm_enable_cap cap = {
> +               .cap = KVM_CAP_X86_USER_SPACE_MSR,
> +               .args[0] = 1,

.args[0] = KVM_MSR_EXIT_REASON_FILTER,

> +       };
> +       struct kvm_vm *vm;
> +       struct kvm_run *run;
> +       int rc;