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kvm-all: drop kvm_setup_guest_memory

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kvm_setup_guest_memory only does "madvise to QEMU_MADV_DONTFORK" and
is only called by ram_block_add, which actually is duplicate code.
Bonus: add simple comment for kvm_has_sync_mmu to make life easier.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Message-Id: <1473662096-32598-1-git-send-email-caoj.fnst@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Cao jin 2016-09-12 14:34:56 +08:00 committed by Paolo Bonzini
parent a952c18683
commit c2cd627ddb
4 changed files with 2 additions and 22 deletions
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4
exec.c
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@ -1621,10 +1621,8 @@ static void ram_block_add(RAMBlock *new_block, Error **errp)
if (new_block->host) {
qemu_ram_setup_dump(new_block->host, new_block->max_length);
qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_HUGEPAGE);
/* MADV_DONTFORK is also needed by KVM in absence of synchronous MMU */
qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_DONTFORK);
if (kvm_enabled()) {
kvm_setup_guest_memory(new_block->host, new_block->max_length);
}
}
}

1
include/sysemu/kvm.h
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@ -221,7 +221,6 @@ int kvm_destroy_vcpu(CPUState *cpu);
#ifdef NEED_CPU_H
#include "cpu.h"
void kvm_setup_guest_memory(void *start, size_t size);
void kvm_flush_coalesced_mmio_buffer(void);
int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,

15
kvm-all.c
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@ -2148,6 +2148,7 @@ void kvm_device_access(int fd, int group, uint64_t attr,
}
}
/* Return 1 on success, 0 on failure */
int kvm_has_sync_mmu(void)
{
return kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
@ -2190,20 +2191,6 @@ int kvm_has_intx_set_mask(void)
return kvm_state->intx_set_mask;
}
void kvm_setup_guest_memory(void *start, size_t size)
{
if (!kvm_has_sync_mmu()) {
int ret = qemu_madvise(start, size, QEMU_MADV_DONTFORK);
if (ret) {
perror("qemu_madvise");
fprintf(stderr,
"Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
exit(1);
}
}
}
#ifdef KVM_CAP_SET_GUEST_DEBUG
struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu,
target_ulong pc)

4
kvm-stub.c
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@ -73,10 +73,6 @@ int kvm_has_many_ioeventfds(void)
return 0;
}
void kvm_setup_guest_memory(void *start, size_t size)
{
}
int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)
{
return -ENOSYS;