0254f07429
When running a PAPR guest, we need to handle a few hypercalls in kernel space, most prominently the page table invalidation (to sync the shadows). So this patch adds handling for a few PAPR hypercalls to PR mode KVM. I tried to share the code with HV mode, but it ended up being a lot easier this way around, as the two differ too much in those details. Signed-off-by: Alexander Graf <agraf@suse.de> --- v1 -> v2: - whitespace fix
158 lines
4 KiB
C
158 lines
4 KiB
C
/*
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* Copyright (C) 2011. Freescale Inc. All rights reserved.
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*
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* Authors:
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* Alexander Graf <agraf@suse.de>
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* Paul Mackerras <paulus@samba.org>
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*
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* Description:
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*
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* Hypercall handling for running PAPR guests in PR KVM on Book 3S
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* processors.
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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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#include <asm/uaccess.h>
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#include <asm/kvm_ppc.h>
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#include <asm/kvm_book3s.h>
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static unsigned long get_pteg_addr(struct kvm_vcpu *vcpu, long pte_index)
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{
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struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
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unsigned long pteg_addr;
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pte_index <<= 4;
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pte_index &= ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1) << 7 | 0x70;
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pteg_addr = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
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pteg_addr |= pte_index;
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return pteg_addr;
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}
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static int kvmppc_h_pr_enter(struct kvm_vcpu *vcpu)
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{
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long flags = kvmppc_get_gpr(vcpu, 4);
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long pte_index = kvmppc_get_gpr(vcpu, 5);
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unsigned long pteg[2 * 8];
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unsigned long pteg_addr, i, *hpte;
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pte_index &= ~7UL;
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pteg_addr = get_pteg_addr(vcpu, pte_index);
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copy_from_user(pteg, (void __user *)pteg_addr, sizeof(pteg));
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hpte = pteg;
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if (likely((flags & H_EXACT) == 0)) {
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pte_index &= ~7UL;
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for (i = 0; ; ++i) {
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if (i == 8)
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return H_PTEG_FULL;
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if ((*hpte & HPTE_V_VALID) == 0)
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break;
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hpte += 2;
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}
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} else {
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i = kvmppc_get_gpr(vcpu, 5) & 7UL;
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hpte += i * 2;
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}
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hpte[0] = kvmppc_get_gpr(vcpu, 6);
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hpte[1] = kvmppc_get_gpr(vcpu, 7);
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copy_to_user((void __user *)pteg_addr, pteg, sizeof(pteg));
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kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
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kvmppc_set_gpr(vcpu, 4, pte_index | i);
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return EMULATE_DONE;
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}
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static int kvmppc_h_pr_remove(struct kvm_vcpu *vcpu)
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{
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unsigned long flags= kvmppc_get_gpr(vcpu, 4);
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unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
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unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
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unsigned long v = 0, pteg, rb;
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unsigned long pte[2];
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pteg = get_pteg_addr(vcpu, pte_index);
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copy_from_user(pte, (void __user *)pteg, sizeof(pte));
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if ((pte[0] & HPTE_V_VALID) == 0 ||
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((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn) ||
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((flags & H_ANDCOND) && (pte[0] & avpn) != 0)) {
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kvmppc_set_gpr(vcpu, 3, H_NOT_FOUND);
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return EMULATE_DONE;
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}
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copy_to_user((void __user *)pteg, &v, sizeof(v));
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rb = compute_tlbie_rb(pte[0], pte[1], pte_index);
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vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
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kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
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kvmppc_set_gpr(vcpu, 4, pte[0]);
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kvmppc_set_gpr(vcpu, 5, pte[1]);
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return EMULATE_DONE;
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}
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static int kvmppc_h_pr_protect(struct kvm_vcpu *vcpu)
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{
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unsigned long flags = kvmppc_get_gpr(vcpu, 4);
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unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
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unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
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unsigned long rb, pteg, r, v;
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unsigned long pte[2];
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pteg = get_pteg_addr(vcpu, pte_index);
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copy_from_user(pte, (void __user *)pteg, sizeof(pte));
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if ((pte[0] & HPTE_V_VALID) == 0 ||
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((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn)) {
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kvmppc_set_gpr(vcpu, 3, H_NOT_FOUND);
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return EMULATE_DONE;
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}
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v = pte[0];
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r = pte[1];
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r &= ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_HI |
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HPTE_R_KEY_LO);
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r |= (flags << 55) & HPTE_R_PP0;
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r |= (flags << 48) & HPTE_R_KEY_HI;
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r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
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pte[1] = r;
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rb = compute_tlbie_rb(v, r, pte_index);
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vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
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copy_to_user((void __user *)pteg, pte, sizeof(pte));
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kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
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return EMULATE_DONE;
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}
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int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
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{
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switch (cmd) {
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case H_ENTER:
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return kvmppc_h_pr_enter(vcpu);
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case H_REMOVE:
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return kvmppc_h_pr_remove(vcpu);
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case H_PROTECT:
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return kvmppc_h_pr_protect(vcpu);
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case H_BULK_REMOVE:
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/* We just flush all PTEs, so user space can
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handle the HPT modifications */
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kvmppc_mmu_pte_flush(vcpu, 0, 0);
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break;
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case H_CEDE:
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kvm_vcpu_block(vcpu);
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vcpu->stat.halt_wakeup++;
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return EMULATE_DONE;
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}
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return EMULATE_FAIL;
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}
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