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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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8cb59788b3
We get an array of instructions from the hypervisor via device tree that we write into a buffer that gets executed whenever we want to make an ePAPR compliant hypercall. However, the hypervisor passes us these instructions in BE order which we have to manually convert to LE when we want to run them in LE mode. With this fixup in place, I can successfully run LE kernels with KVM PV enabled on PR KVM. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Scott Wood <scottwood@freescale.com>
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/*
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* ePAPR para-virtualization support.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright (C) 2012 Freescale Semiconductor, Inc.
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*/
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <asm/epapr_hcalls.h>
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#include <asm/cacheflush.h>
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#include <asm/code-patching.h>
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#include <asm/machdep.h>
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#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
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extern void epapr_ev_idle(void);
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extern u32 epapr_ev_idle_start[];
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#endif
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bool epapr_paravirt_enabled;
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static bool __maybe_unused epapr_has_idle;
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static int __init early_init_dt_scan_epapr(unsigned long node,
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const char *uname,
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int depth, void *data)
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{
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const u32 *insts;
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unsigned long len;
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int i;
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insts = of_get_flat_dt_prop(node, "hcall-instructions", &len);
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if (!insts)
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return 0;
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if (len % 4 || len > (4 * 4))
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return -1;
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for (i = 0; i < (len / 4); i++) {
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u32 inst = be32_to_cpu(insts[i]);
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patch_instruction(epapr_hypercall_start + i, inst);
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#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
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patch_instruction(epapr_ev_idle_start + i, inst);
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#endif
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}
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#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
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if (of_get_flat_dt_prop(node, "has-idle", NULL))
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epapr_has_idle = true;
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#endif
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epapr_paravirt_enabled = true;
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return 1;
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}
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int __init epapr_paravirt_early_init(void)
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{
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of_scan_flat_dt(early_init_dt_scan_epapr, NULL);
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return 0;
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}
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static int __init epapr_idle_init(void)
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{
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#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
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if (epapr_has_idle)
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ppc_md.power_save = epapr_ev_idle;
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#endif
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return 0;
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}
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postcore_initcall(epapr_idle_init);
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