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| author |   Avi Kivity <avi@qumranet.com> | 2007-03-05 19:46:05 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-05-03 10:52:24 +0300 |
| commit | 1961d276c877b99f5f16aaf36377c75e0e191c3a (patch) | |
| tree | 4ea92fc2821bd0f9013ee567ee2f11c6cc532d79 /drivers/kvm/kvm_main.c | |
| parent | KVM: Initialize the apic_base msr on svm too (diff) | |
| download | linux-dev-1961d276c877b99f5f16aaf36377c75e0e191c3a.tar.xz linux-dev-1961d276c877b99f5f16aaf36377c75e0e191c3a.zip | |
KVM: Add guest mode signal mask
Allow a special signal mask to be used while executing in guest mode. This
allows signals to be used to interrupt a vcpu without requiring signal
delivery to a userspace handler, which is quite expensive. Userspace still
receives -EINTR and can get the signal via sigwait().
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/kvm_main.c')
| -rw-r--r-- | drivers/kvm/kvm_main.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index ac44df551aa8..df85f5f65489 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -1591,9 +1591,13 @@ static void complete_pio(struct kvm_vcpu *vcpu) static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { int r; + sigset_t sigsaved; vcpu_load(vcpu); + if (vcpu->sigset_active) + sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); + /* re-sync apic's tpr */ vcpu->cr8 = kvm_run->cr8; @@ -1616,6 +1620,9 @@ static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) r = kvm_arch_ops->run(vcpu, kvm_run); + if (vcpu->sigset_active) + sigprocmask(SIG_SETMASK, &sigsaved, NULL); + vcpu_put(vcpu); return r; } @@ -2142,6 +2149,17 @@ out: return r; } +static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) +{ + if (sigset) { + sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); + vcpu->sigset_active = 1; + vcpu->sigset = *sigset; + } else + vcpu->sigset_active = 0; + return 0; +} + static long kvm_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -2260,6 +2278,29 @@ static long kvm_vcpu_ioctl(struct file *filp, goto out; break; } + case KVM_SET_SIGNAL_MASK: { + struct kvm_signal_mask __user *sigmask_arg = argp; + struct kvm_signal_mask kvm_sigmask; + sigset_t sigset, *p; + + p = NULL; + if (argp) { + r = -EFAULT; + if (copy_from_user(&kvm_sigmask, argp, + sizeof kvm_sigmask)) + goto out; + r = -EINVAL; + if (kvm_sigmask.len != sizeof sigset) + goto out; + r = -EFAULT; + if (copy_from_user(&sigset, sigmask_arg->sigset, + sizeof sigset)) + goto out; + p = &sigset; + } + r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); + break; + } default: ; } |