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https://gitlab.com/qemu-project/qemu
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d2f2b8a740
There used to be a limit of 6 KVM io bus devices in the kernel. On such a kernel, we can't use many ioeventfds for host notification since the limit is reached too easily. Add an API to test for this condition. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
153 lines
2.3 KiB
C
153 lines
2.3 KiB
C
/*
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* QEMU KVM stub
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*
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* Copyright Red Hat, Inc. 2010
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*
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* Author: Paolo Bonzini <pbonzini@redhat.com>
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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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#include "qemu-common.h"
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#include "sysemu.h"
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#include "hw/hw.h"
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#include "exec-all.h"
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#include "gdbstub.h"
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#include "kvm.h"
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int kvm_irqchip_in_kernel(void)
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{
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return 0;
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}
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int kvm_pit_in_kernel(void)
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{
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return 0;
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}
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int kvm_init_vcpu(CPUState *env)
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{
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return -ENOSYS;
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}
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int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)
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{
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return -ENOSYS;
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}
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int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
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{
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return -ENOSYS;
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}
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int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
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{
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return -ENOSYS;
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}
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int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
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{
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return -ENOSYS;
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}
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int kvm_check_extension(KVMState *s, unsigned int extension)
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{
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return 0;
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}
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int kvm_init(int smp_cpus)
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{
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return -ENOSYS;
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}
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void kvm_flush_coalesced_mmio_buffer(void)
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{
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}
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void kvm_cpu_synchronize_state(CPUState *env)
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{
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}
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void kvm_cpu_synchronize_post_reset(CPUState *env)
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{
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}
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void kvm_cpu_synchronize_post_init(CPUState *env)
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{
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}
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int kvm_cpu_exec(CPUState *env)
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{
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abort ();
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}
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int kvm_has_sync_mmu(void)
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{
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return 0;
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}
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int kvm_has_vcpu_events(void)
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{
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return 0;
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}
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int kvm_has_robust_singlestep(void)
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{
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return 0;
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}
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int kvm_has_many_ioeventfds(void)
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{
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return 0;
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}
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void kvm_setup_guest_memory(void *start, size_t size)
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{
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}
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int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
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{
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tb_flush(env);
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return 0;
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}
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int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
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target_ulong len, int type)
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{
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return -EINVAL;
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}
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int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
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target_ulong len, int type)
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{
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return -EINVAL;
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}
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void kvm_remove_all_breakpoints(CPUState *current_env)
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{
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}
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#ifndef _WIN32
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int kvm_set_signal_mask(CPUState *env, const sigset_t *sigset)
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{
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abort();
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}
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#endif
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int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign)
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{
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return -ENOSYS;
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}
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int kvm_set_ioeventfd_mmio_long(int fd, uint32_t adr, uint32_t val, bool assign)
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{
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return -ENOSYS;
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}
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int kvm_on_sigbus(int code, void *addr)
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{
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return 1;
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}
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