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 4.19] 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 @@ -128,6 +128,7 @@ 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) ({ \ @@ -482,6 +483,7 @@ struct kvm { struct srcu_struct srcu; struct srcu_struct irq_srcu; pid_t userspace_pid; + bool vm_bugged; };
#define kvm_err(fmt, ...) \ @@ -510,6 +512,31 @@ 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, @@ -770,7 +797,6 @@ 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 @@ -2820,7 +2820,7 @@ 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)) @@ -3026,7 +3026,7 @@ 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) { @@ -3081,7 +3081,7 @@ 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) { @@ -3244,7 +3244,7 @@ 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: @@ -3422,7 +3422,7 @@ 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) { case KVM_GET_DIRTY_LOG: {