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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/include/uapi/asm/kvm_para.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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/*

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 * Copyright IBM Corp. 2008

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 *

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 * Authors: Hollis Blanchard <[email protected]>

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 */

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#ifndef _UAPI__POWERPC_KVM_PARA_H__

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#define _UAPI__POWERPC_KVM_PARA_H__

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#include <linux/types.h>

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/*

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 * Additions to this struct must only occur at the end, and should be

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 * accompanied by a KVM_MAGIC_FEAT flag to advertise that they are present

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 * (albeit not necessarily relevant to the current target hardware platform).

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 *

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 * Struct fields are always 32 or 64 bit aligned, depending on them being 32

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 * or 64 bit wide respectively.

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 *

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 * See Documentation/virt/kvm/ppc-pv.rst

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 */

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struct kvm_vcpu_arch_shared {

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	__u64 scratch1;

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	__u64 scratch2;

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	__u64 scratch3;

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	__u64 critical;		/* Guest may not get interrupts if == r1 */

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	__u64 sprg0;

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	__u64 sprg1;

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	__u64 sprg2;

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	__u64 sprg3;

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	__u64 srr0;

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	__u64 srr1;

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	__u64 dar;		/* dear on BookE */

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	__u64 msr;

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	__u32 dsisr;

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	__u32 int_pending;	/* Tells the guest if we have an interrupt */

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	__u32 sr[16];

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	__u32 mas0;

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	__u32 mas1;

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	__u64 mas7_3;

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	__u64 mas2;

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	__u32 mas4;

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	__u32 mas6;

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	__u32 esr;

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	__u32 pir;

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	/*

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	 * SPRG4-7 are user-readable, so we can only keep these consistent

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	 * between the shared area and the real registers when there's an

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	 * intervening exit to KVM.  This also applies to SPRG3 on some

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	 * chips.

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	 *

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	 * This suffices for access by guest userspace, since in PR-mode

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	 * KVM, an exit must occur when changing the guest's MSR[PR].

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	 * If the guest kernel writes to SPRG3-7 via the shared area, it

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	 * must also use the shared area for reading while in kernel space.

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	 */

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	__u64 sprg4;

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	__u64 sprg5;

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	__u64 sprg6;

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	__u64 sprg7;

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};

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#define KVM_SC_MAGIC_R0		0x4b564d21 /* "KVM!" */

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#define KVM_HCALL_TOKEN(num)     _EV_HCALL_TOKEN(EV_KVM_VENDOR_ID, num)

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#include <asm/epapr_hcalls.h>

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#define KVM_FEATURE_MAGIC_PAGE	1

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/* Magic page flags from host to guest */

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#define KVM_MAGIC_FEAT_SR		(1 << 0)

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/* MASn, ESR, PIR, and high SPRGs */

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#define KVM_MAGIC_FEAT_MAS0_TO_SPRG7	(1 << 1)

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/* Magic page flags from guest to host */

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#define MAGIC_PAGE_FLAG_NOT_MAPPED_NX	(1 << 0)

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#endif /* _UAPI__POWERPC_KVM_PARA_H__ */

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