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When an SVM makes an hypercall or incurs some other exception, the Ultravisor usually forwards (a.k.a. reflects) the exceptions to the Hypervisor. After processing the exception, Hypervisor uses the UV_RETURN ultracall to return control back to the SVM. The expected register state on entry to this ultracall is: * Non-volatile registers are restored to their original values. * If returning from an hypercall, register R0 contains the return value (unlike other ultracalls) and, registers R4 through R12 contain any output values of the hypercall. * R3 contains the ultracall number, i.e UV_RETURN. * If returning with a synthesized interrupt, R2 contains the synthesized interrupt number. Thanks to input from Paul Mackerras, Ram Pai and Mike Anderson. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Claudio Carvalho <cclaudio@linux.ibm.com> Acked-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190822034838.27876-8-cclaudio@linux.ibm.com
30 lines
618 B
C
30 lines
618 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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#endif /* _ASM_POWERPC_ULTRAVISOR_API_H */
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