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authorPaolo Bonzini <pbonzini@redhat.com>2021-11-11 10:52:26 -0500
committerPaolo Bonzini <pbonzini@redhat.com>2021-11-11 11:02:58 -0500
commit1f05833193d816279b03ec9d0170cf9bda9283c2 (patch)
treef63985f733f3f64e264335ec39501b5e04c9ee71 /include/linux
parentb9ecb9a997333f90236cb6f3d52d83987a17addc (diff)
parent6a58150859fdec7639564c8bae4406d4c66bf017 (diff)
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Merge branch 'kvm-sev-move-context' into kvm-master
Add support for AMD SEV and SEV-ES intra-host migration support. Intra host migration provides a low-cost mechanism for userspace VMM upgrades. In the common case for intra host migration, we can rely on the normal ioctls for passing data from one VMM to the next. SEV, SEV-ES, and other confidential compute environments make most of this information opaque, and render KVM ioctls such as "KVM_GET_REGS" irrelevant. As a result, we need the ability to pass this opaque metadata from one VMM to the next. The easiest way to do this is to leave this data in the kernel, and transfer ownership of the metadata from one KVM VM (or vCPU) to the next. In-kernel hand off makes it possible to move any data that would be unsafe/impossible for the kernel to hand directly to userspace, and cannot be reproduced using data that can be handed to userspace. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/kvm_host.h12
1 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 60a35d9fe259..9e0667e3723e 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -150,7 +150,7 @@ 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_REQ_VM_DEAD (4 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQUEST_ARCH_BASE 8
#define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \
@@ -617,6 +617,7 @@ struct kvm {
unsigned int max_halt_poll_ns;
u32 dirty_ring_size;
bool vm_bugged;
+ bool vm_dead;
#ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
struct notifier_block pm_notifier;
@@ -650,12 +651,19 @@ struct kvm {
#define vcpu_err(vcpu, fmt, ...) \
kvm_err("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
+static inline void kvm_vm_dead(struct kvm *kvm)
+{
+ kvm->vm_dead = true;
+ kvm_make_all_cpus_request(kvm, KVM_REQ_VM_DEAD);
+}
+
static inline void kvm_vm_bugged(struct kvm *kvm)
{
kvm->vm_bugged = true;
- kvm_make_all_cpus_request(kvm, KVM_REQ_VM_BUGGED);
+ kvm_vm_dead(kvm);
}
+
#define KVM_BUG(cond, kvm, fmt...) \
({ \
int __ret = (cond); \