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| author | Zhang Xiantao <xiantao.zhang@intel.com> | 2007-11-18 20:29:43 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-01-30 17:53:05 +0200 |
| commit | 5bb064dcdeb7ab341e2f8a3e2fc34faa63b1662c (patch) | |
| tree | abb976bd8e6f79fca02aeadad31269f281f71c16 /drivers/kvm/x86.c | |
| parent | 9327fd1195b77e67b86db8c1c1c4c4f7db009b00 (diff) | |
| download | lwn-5bb064dcdeb7ab341e2f8a3e2fc34faa63b1662c.tar.gz lwn-5bb064dcdeb7ab341e2f8a3e2fc34faa63b1662c.zip | |
KVM: Portability: Move kvm_vcpu_ioctl_get_dirty_log to arch-specific file
Meanwhile keep the interface in common, and leave as more logic in common
as possible.
Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/x86.c')
| -rw-r--r-- | drivers/kvm/x86.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c index 9618fcba887e..935e2769b787 100644 --- a/drivers/kvm/x86.c +++ b/drivers/kvm/x86.c @@ -937,6 +937,37 @@ static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) return r; } +/* + * Get (and clear) the dirty memory log for a memory slot. + */ +int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, + struct kvm_dirty_log *log) +{ + int r; + int n; + struct kvm_memory_slot *memslot; + int is_dirty = 0; + + mutex_lock(&kvm->lock); + + r = kvm_get_dirty_log(kvm, log, &is_dirty); + if (r) + goto out; + + /* If nothing is dirty, don't bother messing with page tables. */ + if (is_dirty) { + kvm_mmu_slot_remove_write_access(kvm, log->slot); + kvm_flush_remote_tlbs(kvm); + memslot = &kvm->memslots[log->slot]; + n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; + memset(memslot->dirty_bitmap, 0, n); + } + r = 0; +out: + mutex_unlock(&kvm->lock); + return r; +} + long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { |