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The Ultravisor Call Facility (stfle bit 158) defines an API to the Ultravisor (UV calls), a mini hypervisor located at machine level. With help of the Ultravisor, KVM will be able to run "protected" VMs, special VMs whose memory and management data are unavailable to KVM. The protected VMs can also request services from the Ultravisor. The guest api consists of UV calls to share and unshare memory with the kvm hypervisor. To enable this feature support PROTECTED_VIRTUALIZATION_GUEST kconfig option has been introduced. Co-developed-by: Janosch Frank <frankja@de.ibm.com> Signed-off-by: Janosch Frank <frankja@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
24 lines
560 B
C
24 lines
560 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <asm/uv.h>
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#include <asm/facility.h>
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#include <asm/sections.h>
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int __bootdata_preserved(prot_virt_guest);
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void uv_query_info(void)
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{
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struct uv_cb_qui uvcb = {
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.header.cmd = UVC_CMD_QUI,
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.header.len = sizeof(uvcb)
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};
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if (!test_facility(158))
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return;
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if (uv_call(0, (uint64_t)&uvcb))
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return;
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if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
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test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
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prot_virt_guest = 1;
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}
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