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256ba2c168
A new kernel deserves a clean slate. Any pages shared with the hypervisor is unshared before invoking the new kernel. However there are exceptions. If the new kernel is invoked to dump the current kernel, or if there is a explicit request to preserve the state of the current kernel, unsharing of pages is skipped. NOTE: While testing crashkernel, make sure at least 256M is reserved for crashkernel. Otherwise SWIOTLB allocation will fail and crash kernel will fail to boot. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190820021326.6884-11-bauerman@linux.ibm.com
34 lines
744 B
C
34 lines
744 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Ultravisor API.
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*
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* Copyright 2019, IBM Corporation.
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*
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*/
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#ifndef _ASM_POWERPC_ULTRAVISOR_API_H
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#define _ASM_POWERPC_ULTRAVISOR_API_H
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#include <asm/hvcall.h>
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/* Return codes */
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#define U_BUSY H_BUSY
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#define U_FUNCTION H_FUNCTION
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#define U_NOT_AVAILABLE H_NOT_AVAILABLE
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#define U_P2 H_P2
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#define U_P3 H_P3
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#define U_P4 H_P4
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#define U_P5 H_P5
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#define U_PARAMETER H_PARAMETER
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#define U_PERMISSION H_PERMISSION
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#define U_SUCCESS H_SUCCESS
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/* opcodes */
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#define UV_WRITE_PATE 0xF104
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#define UV_RETURN 0xF11C
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#define UV_ESM 0xF110
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#define UV_SHARE_PAGE 0xF130
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#define UV_UNSHARE_PAGE 0xF134
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#define UV_UNSHARE_ALL_PAGES 0xF140
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#endif /* _ASM_POWERPC_ULTRAVISOR_API_H */
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