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s390: autodetect map private

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By default qemu will use MAP_PRIVATE for guest pages. This will write
protect pages and thus break on s390 systems that dont support this feature.
Therefore qemu has a hack to always use MAP_SHARED for s390. But MAP_SHARED
has other problems (no dirty pages tracking, a lot more swap overhead etc.)
Newer systems allow the distinction via KVM_CAP_S390_COW. With this feature
qemu can use the standard qemu alloc if available, otherwise it will use
the old s390 hack.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Acked-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Christian Borntraeger 2012-06-15 05:10:30 +00:00 • committed by Alexander Graf
parent 9233685597
commit fdec991857
5 changed files with 56 additions and 15 deletions
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2
kvm.h
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@ -70,6 +70,8 @@ int kvm_init_vcpu(CPUArchState *env);
int kvm_cpu_exec(CPUArchState *env);
#if !defined(CONFIG_USER_ONLY)
void *kvm_vmalloc(ram_addr_t size);
void *kvm_arch_vmalloc(ram_addr_t size);
void kvm_setup_guest_memory(void *start, size_t size);
int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size);