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kvm: add kvm_arm_get_max_vm_ipa_size 

Add the kvm_arm_get_max_vm_ipa_size() helper that returns the
number of bits in the IPA address space supported by KVM.

This capability needs to be known to create the VM with a
specific IPA max size (kvm_type passed along KVM_CREATE_VM ioctl.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-id: 20190304101339.25970-6-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2019-03-04 11:13:34 +01:00 committed by Peter Maydell
parent dc0ca80eb1
commit a27382e210
2 changed files with 23 additions and 0 deletions
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10
target/arm/kvm.c
View File

@ -18,6 +18,7 @@
#include "qemu/error-report.h"
#include "sysemu/sysemu.h"
#include "sysemu/kvm.h"
#include "sysemu/kvm_int.h"
#include "kvm_arm.h"
#include "cpu.h"
#include "trace.h"
@ -162,6 +163,15 @@ void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
env->features = arm_host_cpu_features.features;
}
int kvm_arm_get_max_vm_ipa_size(MachineState *ms)
{
KVMState *s = KVM_STATE(ms->accelerator);
int ret;
ret = kvm_check_extension(s, KVM_CAP_ARM_VM_IPA_SIZE);
return ret > 0 ? ret : 40;
}
int kvm_arch_init(MachineState *ms, KVMState *s)
{
/* For ARM interrupt delivery is always asynchronous,

13
target/arm/kvm_arm.h
View File

@ -207,6 +207,14 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf);
*/
void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu);
/**
* kvm_arm_get_max_vm_ipa_size - Returns the number of bits in the
* IPA address space supported by KVM
*
* @ms: Machine state handle
*/
int kvm_arm_get_max_vm_ipa_size(MachineState *ms);
/**
* kvm_arm_sync_mpstate_to_kvm
* @cpu: ARMCPU
@ -239,6 +247,11 @@ static inline void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
cpu->host_cpu_probe_failed = true;
}
static inline int kvm_arm_get_max_vm_ipa_size(MachineState *ms)
{
return -ENOENT;
}
static inline int kvm_arm_vgic_probe(void)
{
return 0;