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Subject[RFC PATCH v2 17/69] KVM: Add infrastructure and macro to mark VM as bugged
Date
From: Sean Christopherson <sean.j.christopherson@intel.com>

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
include/linux/kvm_host.h | 29 ++++++++++++++++++++++++++++-
virt/kvm/kvm_main.c | 10 +++++-----
2 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 8583ed3ff344..09618f8a1338 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -149,6 +149,7 @@ static inline bool is_error_page(struct page *page)
#define KVM_REQ_MMU_RELOAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_UNBLOCK 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) ({ \
@@ -585,6 +586,8 @@ struct kvm {
pid_t userspace_pid;
unsigned int max_halt_poll_ns;
u32 dirty_ring_size;
+
+ bool vm_bugged;
};

#define kvm_err(fmt, ...) \
@@ -613,6 +616,31 @@ 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 bool kvm_dirty_log_manual_protect_and_init_set(struct kvm *kvm)
{
return !!(kvm->manual_dirty_log_protect & KVM_DIRTY_LOG_INITIALLY_SET);
@@ -930,7 +958,6 @@ void *kvm_mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc);
bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
struct kvm_vcpu *except,
unsigned long *vcpu_bitmap, cpumask_var_t tmp);
-bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
bool kvm_make_all_cpus_request_except(struct kvm *kvm, unsigned int req,
struct kvm_vcpu *except);
bool kvm_make_cpus_request_mask(struct kvm *kvm, unsigned int req,
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 751d1f6890b0..dc752d0bd3ec 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3435,7 +3435,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
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))
@@ -3641,7 +3641,7 @@ static long kvm_vcpu_compat_ioctl(struct file *filp,
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) {
@@ -3707,7 +3707,7 @@ static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
{
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) {
@@ -3991,7 +3991,7 @@ static long kvm_vm_ioctl(struct file *filp,
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:
@@ -4189,7 +4189,7 @@ static long kvm_vm_compat_ioctl(struct file *filp,
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: {
--
2.25.1
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