mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2025-01-14 20:06:34 +07:00
d30f6e4800
Chips such as e500mc that implement category E.HV in Power ISA 2.06 provide hardware virtualization features, including a new MSR mode for guest state. The guest OS can perform many operations without trapping into the hypervisor, including transitions to and from guest userspace. Since we can use SRR1[GS] to reliably tell whether an exception came from guest state, instead of messing around with IVPR, we use DO_KVM similarly to book3s. Current issues include: - Machine checks from guest state are not routed to the host handler. - The guest can cause a host oops by executing an emulated instruction in a page that lacks read permission. Existing e500/4xx support has the same problem. Includes work by Ashish Kalra <Ashish.Kalra@freescale.com>, Varun Sethi <Varun.Sethi@freescale.com>, and Liu Yu <yu.liu@freescale.com>. Signed-off-by: Scott Wood <scottwood@freescale.com> [agraf: remove pt_regs usage] Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/*
|
|
* Copyright 2009 Freescale Semicondutor, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* provides masks and opcode images for use by code generation, emulation
|
|
* and for instructions that older assemblers might not know about
|
|
*/
|
|
#ifndef _ASM_POWERPC_DBELL_H
|
|
#define _ASM_POWERPC_DBELL_H
|
|
|
|
#include <linux/smp.h>
|
|
#include <linux/threads.h>
|
|
|
|
#include <asm/ppc-opcode.h>
|
|
|
|
#define PPC_DBELL_MSG_BRDCAST (0x04000000)
|
|
#define PPC_DBELL_TYPE(x) (((x) & 0xf) << (63-36))
|
|
#define PPC_DBELL_LPID(x) ((x) << (63 - 49))
|
|
enum ppc_dbell {
|
|
PPC_DBELL = 0, /* doorbell */
|
|
PPC_DBELL_CRIT = 1, /* critical doorbell */
|
|
PPC_G_DBELL = 2, /* guest doorbell */
|
|
PPC_G_DBELL_CRIT = 3, /* guest critical doorbell */
|
|
PPC_G_DBELL_MC = 4, /* guest mcheck doorbell */
|
|
};
|
|
|
|
extern void doorbell_cause_ipi(int cpu, unsigned long data);
|
|
extern void doorbell_exception(struct pt_regs *regs);
|
|
extern void doorbell_setup_this_cpu(void);
|
|
|
|
static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
|
|
{
|
|
u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
|
|
(tag & 0x07ffffff);
|
|
|
|
__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
|
|
}
|
|
|
|
#endif /* _ASM_POWERPC_DBELL_H */
|