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0fd7e098db
The commit 317b0a6d8 fixed an issue which caused by the outdated
env->tsc value, but the fix lead to 'cpu_synchronize_all_states()'
called twice during live migration. The 'cpu_synchronize_all_states()'
takes about 130us for a VM which has 4 vcpus, it's a bit expensive.
Synchronize the whole CPU context just for updating env->tsc is too
wasting, this patch use a new function to update the env->tsc.
Comparing to 'cpu_synchronize_all_states()', it only takes about 20us.
Signed-off-by: Liang Li <liang.z.li@intel.com>
Message-Id: <1446695464-27116-2-git-send-email-liang.z.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/*
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* QEMU KVM support -- x86 specific functions.
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*
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* Copyright (c) 2012 Linaro Limited
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_KVM_I386_H
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#define QEMU_KVM_I386_H
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#include "sysemu/kvm.h"
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bool kvm_allows_irq0_override(void);
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bool kvm_has_smm(void);
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void kvm_synchronize_all_tsc(void);
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void kvm_arch_reset_vcpu(X86CPU *cs);
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void kvm_arch_do_init_vcpu(X86CPU *cs);
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int kvm_device_pci_assign(KVMState *s, PCIHostDeviceAddress *dev_addr,
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uint32_t flags, uint32_t *dev_id);
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int kvm_device_pci_deassign(KVMState *s, uint32_t dev_id);
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int kvm_device_intx_assign(KVMState *s, uint32_t dev_id,
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bool use_host_msi, uint32_t guest_irq);
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int kvm_device_intx_set_mask(KVMState *s, uint32_t dev_id, bool masked);
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int kvm_device_intx_deassign(KVMState *s, uint32_t dev_id, bool use_host_msi);
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int kvm_device_msi_assign(KVMState *s, uint32_t dev_id, int virq);
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int kvm_device_msi_deassign(KVMState *s, uint32_t dev_id);
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bool kvm_device_msix_supported(KVMState *s);
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int kvm_device_msix_init_vectors(KVMState *s, uint32_t dev_id,
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uint32_t nr_vectors);
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int kvm_device_msix_set_vector(KVMState *s, uint32_t dev_id, uint32_t vector,
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int virq);
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int kvm_device_msix_assign(KVMState *s, uint32_t dev_id);
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int kvm_device_msix_deassign(KVMState *s, uint32_t dev_id);
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#endif
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