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x86: add support for KVM_CAP_XSAVE2 and AMX state migration

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When dynamic xfeatures (e.g. AMX) are used by the guest, the xsave
area would be larger than 4KB. KVM_GET_XSAVE2 and KVM_SET_XSAVE
under KVM_CAP_XSAVE2 works with a xsave buffer larger than 4KB.
Always use the new ioctls under KVM_CAP_XSAVE2 when KVM supports it.

Signed-off-by: Jing Liu <jing2.liu@intel.com>
Signed-off-by: Zeng Guang <guang.zeng@intel.com>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20220217060434.52460-7-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jing Liu 2022-02-16 22:04:32 -08:00 • committed by Paolo Bonzini
parent f21a48171c
commit e56dd3c70a
3 changed files with 59 additions and 15 deletions
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28
target/i386/xsave_helper.c
View file

@ -126,6 +126,20 @@ void x86_cpu_xsave_all_areas(X86CPU *cpu, void *buf, uint32_t buflen)
memcpy(pkru, &env->pkru, sizeof(env->pkru));
}
e = &x86_ext_save_areas[XSTATE_XTILE_CFG_BIT];
if (e->size && e->offset) {
XSaveXTILECFG *tilecfg = buf + e->offset;
memcpy(tilecfg, &env->xtilecfg, sizeof(env->xtilecfg));
}
e = &x86_ext_save_areas[XSTATE_XTILE_DATA_BIT];
if (e->size && e->offset && buflen >= e->size + e->offset) {
XSaveXTILEDATA *tiledata = buf + e->offset;
memcpy(tiledata, &env->xtiledata, sizeof(env->xtiledata));
}
#endif
}
@ -247,5 +261,19 @@ void x86_cpu_xrstor_all_areas(X86CPU *cpu, const void *buf, uint32_t buflen)
pkru = buf + e->offset;
memcpy(&env->pkru, pkru, sizeof(env->pkru));
}
e = &x86_ext_save_areas[XSTATE_XTILE_CFG_BIT];
if (e->size && e->offset) {
const XSaveXTILECFG *tilecfg = buf + e->offset;
memcpy(&env->xtilecfg, tilecfg, sizeof(env->xtilecfg));
}
e = &x86_ext_save_areas[XSTATE_XTILE_DATA_BIT];
if (e->size && e->offset && buflen >= e->size + e->offset) {
const XSaveXTILEDATA *tiledata = buf + e->offset;
memcpy(&env->xtiledata, tiledata, sizeof(env->xtiledata));
}
#endif
}