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    Subject[PATCH 5.4 277/389] KVM: Add infrastructure and macro to mark VM as bugged
    Date
    From: Sean Christopherson <sean.j.christopherson@intel.com>

    commit 0b8f11737cffc1a406d1134b58687abc29d76b52 upstream

    Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
    Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
    Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
    Message-Id: <3a0998645c328bf0895f1290e61821b70f048549.1625186503.git.isaku.yamahata@intel.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    [SG: Adjusted context for kernel version 5.4]
    Signed-off-by: Stefan Ghinea <stefan.ghinea@windriver.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    include/linux/kvm_host.h | 28 +++++++++++++++++++++++++++-
    virt/kvm/kvm_main.c | 10 +++++-----
    2 files changed, 32 insertions(+), 6 deletions(-)

    --- a/include/linux/kvm_host.h
    +++ b/include/linux/kvm_host.h
    @@ -146,6 +146,7 @@ static inline bool is_error_page(struct
    #define KVM_REQ_MMU_RELOAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
    #define KVM_REQ_PENDING_TIMER 2
    #define KVM_REQ_UNHALT 3
    +#define KVM_REQ_VM_BUGGED (4 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
    #define KVM_REQUEST_ARCH_BASE 8

    #define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \
    @@ -502,6 +503,7 @@ struct kvm {
    struct srcu_struct srcu;
    struct srcu_struct irq_srcu;
    pid_t userspace_pid;
    + bool vm_bugged;
    };

    #define kvm_err(fmt, ...) \
    @@ -530,6 +532,31 @@ struct kvm {
    #define vcpu_err(vcpu, fmt, ...) \
    kvm_err("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)

    +bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
    +static inline void kvm_vm_bugged(struct kvm *kvm)
    +{
    + kvm->vm_bugged = true;
    + kvm_make_all_cpus_request(kvm, KVM_REQ_VM_BUGGED);
    +}
    +
    +#define KVM_BUG(cond, kvm, fmt...) \
    +({ \
    + int __ret = (cond); \
    + \
    + if (WARN_ONCE(__ret && !(kvm)->vm_bugged, fmt)) \
    + kvm_vm_bugged(kvm); \
    + unlikely(__ret); \
    +})
    +
    +#define KVM_BUG_ON(cond, kvm) \
    +({ \
    + int __ret = (cond); \
    + \
    + if (WARN_ON_ONCE(__ret && !(kvm)->vm_bugged)) \
    + kvm_vm_bugged(kvm); \
    + unlikely(__ret); \
    +})
    +
    static inline struct kvm_io_bus *kvm_get_bus(struct kvm *kvm, enum kvm_bus idx)
    {
    return srcu_dereference_check(kvm->buses[idx], &kvm->srcu,
    @@ -790,7 +817,6 @@ void kvm_reload_remote_mmus(struct kvm *

    bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
    unsigned long *vcpu_bitmap, cpumask_var_t tmp);
    -bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);

    long kvm_arch_dev_ioctl(struct file *filp,
    unsigned int ioctl, unsigned long arg);
    --- a/virt/kvm/kvm_main.c
    +++ b/virt/kvm/kvm_main.c
    @@ -2937,7 +2937,7 @@ static long kvm_vcpu_ioctl(struct file *
    struct kvm_fpu *fpu = NULL;
    struct kvm_sregs *kvm_sregs = NULL;

    - if (vcpu->kvm->mm != current->mm)
    + if (vcpu->kvm->mm != current->mm || vcpu->kvm->vm_bugged)
    return -EIO;

    if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
    @@ -3144,7 +3144,7 @@ static long kvm_vcpu_compat_ioctl(struct
    void __user *argp = compat_ptr(arg);
    int r;

    - if (vcpu->kvm->mm != current->mm)
    + if (vcpu->kvm->mm != current->mm || vcpu->kvm->vm_bugged)
    return -EIO;

    switch (ioctl) {
    @@ -3209,7 +3209,7 @@ static long kvm_device_ioctl(struct file
    {
    struct kvm_device *dev = filp->private_data;

    - if (dev->kvm->mm != current->mm)
    + if (dev->kvm->mm != current->mm || dev->kvm->vm_bugged)
    return -EIO;

    switch (ioctl) {
    @@ -3413,7 +3413,7 @@ static long kvm_vm_ioctl(struct file *fi
    void __user *argp = (void __user *)arg;
    int r;

    - if (kvm->mm != current->mm)
    + if (kvm->mm != current->mm || kvm->vm_bugged)
    return -EIO;
    switch (ioctl) {
    case KVM_CREATE_VCPU:
    @@ -3621,7 +3621,7 @@ static long kvm_vm_compat_ioctl(struct f
    struct kvm *kvm = filp->private_data;
    int r;

    - if (kvm->mm != current->mm)
    + if (kvm->mm != current->mm || kvm->vm_bugged)
    return -EIO;
    switch (ioctl) {
    #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT

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