mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
6c85b7bc63
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
29 lines
618 B
C
29 lines
618 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Ultravisor API.
|
|
*
|
|
* Copyright 2019, IBM Corporation.
|
|
*
|
|
*/
|
|
#ifndef _ASM_POWERPC_ULTRAVISOR_API_H
|
|
#define _ASM_POWERPC_ULTRAVISOR_API_H
|
|
|
|
#include <asm/hvcall.h>
|
|
|
|
/* Return codes */
|
|
#define U_BUSY H_BUSY
|
|
#define U_FUNCTION H_FUNCTION
|
|
#define U_NOT_AVAILABLE H_NOT_AVAILABLE
|
|
#define U_P2 H_P2
|
|
#define U_P3 H_P3
|
|
#define U_P4 H_P4
|
|
#define U_P5 H_P5
|
|
#define U_PARAMETER H_PARAMETER
|
|
#define U_PERMISSION H_PERMISSION
|
|
#define U_SUCCESS H_SUCCESS
|
|
|
|
/* opcodes */
|
|
#define UV_WRITE_PATE 0xF104
|
|
#define UV_RETURN 0xF11C
|
|
|
|
#endif /* _ASM_POWERPC_ULTRAVISOR_API_H */
|