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hvf: arm: Implement -cpu host

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Now that we have working system register sync, we push more target CPU
properties into the virtual machine. That might be useful in some
situations, but is not the typical case that users want.

So let's add a -cpu host option that allows them to explicitly pass all
CPU capabilities of their host CPU into the guest.

Signed-off-by: Alexander Graf <agraf@csgraf.de>
Acked-by: Roman Bolshakov <r.bolshakov@yadro.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20210916155404.86958-7-agraf@csgraf.de
[PMM: drop unnecessary #include line from .h file]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2021-09-20 10:21:08 +01:00
parent 219c101fa7
commit 585df85efe
5 changed files with 124 additions and 6 deletions
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13
target/arm/cpu.c
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@ -39,6 +39,7 @@
#include "sysemu/tcg.h"
#include "sysemu/hw_accel.h"
#include "kvm_arm.h"
#include "hvf_arm.h"
#include "disas/capstone.h"
#include "fpu/softfloat.h"
@ -1417,8 +1418,8 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
* this is the first point where we can report it.
*/
if (cpu->host_cpu_probe_failed) {
if (!kvm_enabled()) {
error_setg(errp, "The 'host' CPU type can only be used with KVM");
if (!kvm_enabled() && !hvf_enabled()) {
error_setg(errp, "The 'host' CPU type can only be used with KVM or HVF");
} else {
error_setg(errp, "Failed to retrieve host CPU features");
}
@ -2078,15 +2079,19 @@ static void arm_cpu_class_init(ObjectClass *oc, void *data)
#endif /* CONFIG_TCG */
}
#ifdef CONFIG_KVM
#if defined(CONFIG_KVM) || defined(CONFIG_HVF)
static void arm_host_initfn(Object *obj)
{
ARMCPU *cpu = ARM_CPU(obj);
#ifdef CONFIG_KVM
kvm_arm_set_cpu_features_from_host(cpu);
if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
aarch64_add_sve_properties(obj);
}
#else
hvf_arm_set_cpu_features_from_host(cpu);
#endif
arm_cpu_post_init(obj);
}
@ -2146,7 +2151,7 @@ static void arm_cpu_register_types(void)
{
type_register_static(&arm_cpu_type_info);
#ifdef CONFIG_KVM
#if defined(CONFIG_KVM) || defined(CONFIG_HVF)
type_register_static(&host_arm_cpu_type_info);
#endif
}