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linux/arch/powerpc/kvm/book3s_hv_nestedv2.c
Christophe JAILLET b52e8cd3f8 KVM: PPC: Book3S HV nestedv2: Fix an error handling path in gs_msg_ops_kvmhv_nestedv2_config_fill_info() 
The return value of kvmppc_gse_put_buff_info() is not assigned to 'rc' and
'rc' is uninitialized at this point.
So the error handling can not work.

Assign the expected value to 'rc' to fix the issue.

Fixes: 19d31c5f11 ("KVM: PPC: Add support for nestedv2 guests")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/a7ed4cc12e0a0bbd97fac44fe6c222d1c393ec95.1706441651.git.christophe.jaillet@wanadoo.fr
2024-05-08 01:28:00 +10:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2023 Jordan Niethe, IBM Corp. <jniethe5@gmail.com>
*
* Authors:
* Jordan Niethe <jniethe5@gmail.com>
*
* Description: KVM functions specific to running on Book 3S
* processors as a NESTEDv2 guest.
*
*/
#include "linux/blk-mq.h"
#include "linux/console.h"
#include "linux/gfp_types.h"
#include "linux/signal.h"
#include <linux/kernel.h>
#include <linux/kvm_host.h>
#include <linux/pgtable.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/hvcall.h>
#include <asm/pgalloc.h>
#include <asm/reg.h>
#include <asm/plpar_wrappers.h>
#include <asm/guest-state-buffer.h>
#include "trace_hv.h"
struct static_key_false __kvmhv_is_nestedv2 __read_mostly;
EXPORT_SYMBOL_GPL(__kvmhv_is_nestedv2);
static size_t
gs_msg_ops_kvmhv_nestedv2_config_get_size(struct kvmppc_gs_msg *gsm)
{
u16 ids[] = {
KVMPPC_GSID_RUN_OUTPUT_MIN_SIZE,
KVMPPC_GSID_RUN_INPUT,
KVMPPC_GSID_RUN_OUTPUT,
};
size_t size = 0;
for (int i = 0; i < ARRAY_SIZE(ids); i++)
size += kvmppc_gse_total_size(kvmppc_gsid_size(ids[i]));
return size;
}
static int
gs_msg_ops_kvmhv_nestedv2_config_fill_info(struct kvmppc_gs_buff *gsb,
struct kvmppc_gs_msg *gsm)
{
struct kvmhv_nestedv2_config *cfg;
int rc;
cfg = gsm->data;
if (kvmppc_gsm_includes(gsm, KVMPPC_GSID_RUN_OUTPUT_MIN_SIZE)) {
rc = kvmppc_gse_put_u64(gsb, KVMPPC_GSID_RUN_OUTPUT_MIN_SIZE,
cfg->vcpu_run_output_size);
if (rc < 0)
return rc;
}
if (kvmppc_gsm_includes(gsm, KVMPPC_GSID_RUN_INPUT)) {
rc = kvmppc_gse_put_buff_info(gsb, KVMPPC_GSID_RUN_INPUT,
cfg->vcpu_run_input_cfg);
if (rc < 0)
return rc;
}
if (kvmppc_gsm_includes(gsm, KVMPPC_GSID_RUN_OUTPUT)) {
rc = kvmppc_gse_put_buff_info(gsb, KVMPPC_GSID_RUN_OUTPUT,
cfg->vcpu_run_output_cfg);
if (rc < 0)
return rc;
}
return 0;
}
static int
gs_msg_ops_kvmhv_nestedv2_config_refresh_info(struct kvmppc_gs_msg *gsm,
struct kvmppc_gs_buff *gsb)
{
struct kvmhv_nestedv2_config *cfg;
struct kvmppc_gs_parser gsp = { 0 };
struct kvmppc_gs_elem *gse;
int rc;
cfg = gsm->data;
rc = kvmppc_gse_parse(&gsp, gsb);
if (rc < 0)
return rc;
gse = kvmppc_gsp_lookup(&gsp, KVMPPC_GSID_RUN_OUTPUT_MIN_SIZE);
if (gse)
cfg->vcpu_run_output_size = kvmppc_gse_get_u64(gse);
return 0;
}
static struct kvmppc_gs_msg_ops config_msg_ops = {
.get_size = gs_msg_ops_kvmhv_nestedv2_config_get_size,
.fill_info = gs_msg_ops_kvmhv_nestedv2_config_fill_info,
.refresh_info = gs_msg_ops_kvmhv_nestedv2_config_refresh_info,
};
static size_t gs_msg_ops_vcpu_get_size(struct kvmppc_gs_msg *gsm)
{
struct kvmppc_gs_bitmap gsbm = { 0 };
size_t size = 0;
u16 iden;
kvmppc_gsbm_fill(&gsbm);
kvmppc_gsbm_for_each(&gsbm, iden)
{
switch (iden) {
case KVMPPC_GSID_HOST_STATE_SIZE:
case KVMPPC_GSID_RUN_OUTPUT_MIN_SIZE:
case KVMPPC_GSID_PARTITION_TABLE:
case KVMPPC_GSID_PROCESS_TABLE:
case KVMPPC_GSID_RUN_INPUT:
case KVMPPC_GSID_RUN_OUTPUT:
break;
default:
size += kvmppc_gse_total_size(kvmppc_gsid_size(iden));
}
}
return size;
}
static int gs_msg_ops_vcpu_fill_info(struct kvmppc_gs_buff *gsb,
struct kvmppc_gs_msg *gsm)
{
struct kvm_vcpu *vcpu;
vector128 v;
int rc, i;
u16 iden;
u32 arch_compat = 0;
vcpu = gsm->data;
kvmppc_gsm_for_each(gsm, iden)
{
rc = 0;
if ((gsm->flags & KVMPPC_GS_FLAGS_WIDE) !=
(kvmppc_gsid_flags(iden) & KVMPPC_GS_FLAGS_WIDE))
continue;
switch (iden) {
case KVMPPC_GSID_DSCR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.dscr);
break;
case KVMPPC_GSID_MMCRA:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.mmcra);
break;
case KVMPPC_GSID_HFSCR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.hfscr);
break;
case KVMPPC_GSID_PURR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.purr);
break;
case KVMPPC_GSID_SPURR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.spurr);
break;
case KVMPPC_GSID_AMR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.amr);
break;
case KVMPPC_GSID_UAMOR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.uamor);
break;
case KVMPPC_GSID_SIAR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.siar);
break;
case KVMPPC_GSID_SDAR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.sdar);
break;
case KVMPPC_GSID_IAMR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.iamr);
break;
case KVMPPC_GSID_DAWR0:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.dawr0);
break;
case KVMPPC_GSID_DAWR1:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.dawr1);
break;
case KVMPPC_GSID_DAWRX0:
rc = kvmppc_gse_put_u32(gsb, iden, vcpu->arch.dawrx0);
break;
case KVMPPC_GSID_DAWRX1:
rc = kvmppc_gse_put_u32(gsb, iden, vcpu->arch.dawrx1);
break;
case KVMPPC_GSID_CIABR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.ciabr);
break;
case KVMPPC_GSID_WORT:
rc = kvmppc_gse_put_u32(gsb, iden, vcpu->arch.wort);
break;
case KVMPPC_GSID_PPR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.ppr);
break;
case KVMPPC_GSID_PSPB:
rc = kvmppc_gse_put_u32(gsb, iden, vcpu->arch.pspb);
break;
case KVMPPC_GSID_TAR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.tar);
break;
case KVMPPC_GSID_FSCR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.fscr);
break;
case KVMPPC_GSID_EBBHR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.ebbhr);
break;
case KVMPPC_GSID_EBBRR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.ebbrr);
break;
case KVMPPC_GSID_BESCR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.bescr);
break;
case KVMPPC_GSID_IC:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.ic);
break;
case KVMPPC_GSID_CTRL:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.ctrl);
break;
case KVMPPC_GSID_PIDR:
rc = kvmppc_gse_put_u32(gsb, iden, vcpu->arch.pid);
break;
case KVMPPC_GSID_AMOR: {
u64 amor = ~0;
rc = kvmppc_gse_put_u64(gsb, iden, amor);
break;
}
case KVMPPC_GSID_VRSAVE:
rc = kvmppc_gse_put_u32(gsb, iden, vcpu->arch.vrsave);
break;
case KVMPPC_GSID_MMCR(0)... KVMPPC_GSID_MMCR(3):
i = iden - KVMPPC_GSID_MMCR(0);
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.mmcr[i]);
break;
case KVMPPC_GSID_SIER(0)... KVMPPC_GSID_SIER(2):
i = iden - KVMPPC_GSID_SIER(0);
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.sier[i]);
break;
case KVMPPC_GSID_PMC(0)... KVMPPC_GSID_PMC(5):
i = iden - KVMPPC_GSID_PMC(0);
rc = kvmppc_gse_put_u32(gsb, iden, vcpu->arch.pmc[i]);
break;
case KVMPPC_GSID_GPR(0)... KVMPPC_GSID_GPR(31):
i = iden - KVMPPC_GSID_GPR(0);
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.regs.gpr[i]);
break;
case KVMPPC_GSID_CR:
rc = kvmppc_gse_put_u32(gsb, iden, vcpu->arch.regs.ccr);
break;
case KVMPPC_GSID_XER:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.regs.xer);
break;
case KVMPPC_GSID_CTR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.regs.ctr);
break;
case KVMPPC_GSID_LR:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.regs.link);
break;
case KVMPPC_GSID_NIA:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.regs.nip);
break;
case KVMPPC_GSID_SRR0:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.shregs.srr0);
break;
case KVMPPC_GSID_SRR1:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.shregs.srr1);
break;
case KVMPPC_GSID_SPRG0:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.shregs.sprg0);
break;
case KVMPPC_GSID_SPRG1:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.shregs.sprg1);
break;
case KVMPPC_GSID_SPRG2:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.shregs.sprg2);
break;
case KVMPPC_GSID_SPRG3:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.shregs.sprg3);
break;
case KVMPPC_GSID_DAR:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.shregs.dar);
break;
case KVMPPC_GSID_DSISR:
rc = kvmppc_gse_put_u32(gsb, iden,
vcpu->arch.shregs.dsisr);
break;
case KVMPPC_GSID_MSR:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.shregs.msr);
break;
case KVMPPC_GSID_VTB:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.vcore->vtb);
break;
case KVMPPC_GSID_LPCR:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.vcore->lpcr);
break;
case KVMPPC_GSID_TB_OFFSET:
rc = kvmppc_gse_put_u64(gsb, iden,
vcpu->arch.vcore->tb_offset);
break;
case KVMPPC_GSID_FPSCR:
rc = kvmppc_gse_put_u64(gsb, iden, vcpu->arch.fp.fpscr);
break;
case KVMPPC_GSID_VSRS(0)... KVMPPC_GSID_VSRS(31):
i = iden - KVMPPC_GSID_VSRS(0);
memcpy(&v, &vcpu->arch.fp.fpr[i],
sizeof(vcpu->arch.fp.fpr[i]));
rc = kvmppc_gse_put_vector128(gsb, iden, &v);
break;
#ifdef CONFIG_VSX
case KVMPPC_GSID_VSCR:
rc = kvmppc_gse_put_u32(gsb, iden,
vcpu->arch.vr.vscr.u[3]);
break;
case KVMPPC_GSID_VSRS(32)... KVMPPC_GSID_VSRS(63):
i = iden - KVMPPC_GSID_VSRS(32);
rc = kvmppc_gse_put_vector128(gsb, iden,
&vcpu->arch.vr.vr[i]);
break;
#endif
case KVMPPC_GSID_DEC_EXPIRY_TB: {
u64 dw;
dw = vcpu->arch.dec_expires -
vcpu->arch.vcore->tb_offset;
rc = kvmppc_gse_put_u64(gsb, iden, dw);
break;
}
case KVMPPC_GSID_LOGICAL_PVR:
/*
* Though 'arch_compat == 0' would mean the default
* compatibility, arch_compat, being a Guest Wide
* Element, cannot be filled with a value of 0 in GSB
* as this would result into a kernel trap.
* Hence, when `arch_compat == 0`, arch_compat should
* default to L1's PVR.
*/
if (!vcpu->arch.vcore->arch_compat) {
if (cpu_has_feature(CPU_FTR_ARCH_31))
arch_compat = PVR_ARCH_31;
else if (cpu_has_feature(CPU_FTR_ARCH_300))
arch_compat = PVR_ARCH_300;
} else {
arch_compat = vcpu->arch.vcore->arch_compat;
}
rc = kvmppc_gse_put_u32(gsb, iden, arch_compat);
break;
}
if (rc < 0)
return rc;
}
return 0;
}
static int gs_msg_ops_vcpu_refresh_info(struct kvmppc_gs_msg *gsm,
struct kvmppc_gs_buff *gsb)
{
struct kvmppc_gs_parser gsp = { 0 };
struct kvmhv_nestedv2_io *io;
struct kvmppc_gs_bitmap *valids;
struct kvm_vcpu *vcpu;
struct kvmppc_gs_elem *gse;
vector128 v;
int rc, i;
u16 iden;
vcpu = gsm->data;
rc = kvmppc_gse_parse(&gsp, gsb);
if (rc < 0)
return rc;
io = &vcpu->arch.nestedv2_io;
valids = &io->valids;
kvmppc_gsp_for_each(&gsp, iden, gse)
{
switch (iden) {
case KVMPPC_GSID_DSCR:
vcpu->arch.dscr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_MMCRA:
vcpu->arch.mmcra = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_HFSCR:
vcpu->arch.hfscr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_PURR:
vcpu->arch.purr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_SPURR:
vcpu->arch.spurr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_AMR:
vcpu->arch.amr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_UAMOR:
vcpu->arch.uamor = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_SIAR:
vcpu->arch.siar = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_SDAR:
vcpu->arch.sdar = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_IAMR:
vcpu->arch.iamr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_DAWR0:
vcpu->arch.dawr0 = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_DAWR1:
vcpu->arch.dawr1 = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_DAWRX0:
vcpu->arch.dawrx0 = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_DAWRX1:
vcpu->arch.dawrx1 = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_CIABR:
vcpu->arch.ciabr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_WORT:
vcpu->arch.wort = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_PPR:
vcpu->arch.ppr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_PSPB:
vcpu->arch.pspb = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_TAR:
vcpu->arch.tar = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_FSCR:
vcpu->arch.fscr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_EBBHR:
vcpu->arch.ebbhr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_EBBRR:
vcpu->arch.ebbrr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_BESCR:
vcpu->arch.bescr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_IC:
vcpu->arch.ic = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_CTRL:
vcpu->arch.ctrl = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_PIDR:
vcpu->arch.pid = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_AMOR:
break;
case KVMPPC_GSID_VRSAVE:
vcpu->arch.vrsave = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_MMCR(0)... KVMPPC_GSID_MMCR(3):
i = iden - KVMPPC_GSID_MMCR(0);
vcpu->arch.mmcr[i] = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_SIER(0)... KVMPPC_GSID_SIER(2):
i = iden - KVMPPC_GSID_SIER(0);
vcpu->arch.sier[i] = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_PMC(0)... KVMPPC_GSID_PMC(5):
i = iden - KVMPPC_GSID_PMC(0);
vcpu->arch.pmc[i] = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_GPR(0)... KVMPPC_GSID_GPR(31):
i = iden - KVMPPC_GSID_GPR(0);
vcpu->arch.regs.gpr[i] = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_CR:
vcpu->arch.regs.ccr = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_XER:
vcpu->arch.regs.xer = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_CTR:
vcpu->arch.regs.ctr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_LR:
vcpu->arch.regs.link = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_NIA:
vcpu->arch.regs.nip = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_SRR0:
vcpu->arch.shregs.srr0 = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_SRR1:
vcpu->arch.shregs.srr1 = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_SPRG0:
vcpu->arch.shregs.sprg0 = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_SPRG1:
vcpu->arch.shregs.sprg1 = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_SPRG2:
vcpu->arch.shregs.sprg2 = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_SPRG3:
vcpu->arch.shregs.sprg3 = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_DAR:
vcpu->arch.shregs.dar = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_DSISR:
vcpu->arch.shregs.dsisr = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_MSR:
vcpu->arch.shregs.msr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_VTB:
vcpu->arch.vcore->vtb = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_LPCR:
vcpu->arch.vcore->lpcr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_TB_OFFSET:
vcpu->arch.vcore->tb_offset = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_FPSCR:
vcpu->arch.fp.fpscr = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_VSRS(0)... KVMPPC_GSID_VSRS(31):
kvmppc_gse_get_vector128(gse, &v);
i = iden - KVMPPC_GSID_VSRS(0);
memcpy(&vcpu->arch.fp.fpr[i], &v,
sizeof(vcpu->arch.fp.fpr[i]));
break;
#ifdef CONFIG_VSX
case KVMPPC_GSID_VSCR:
vcpu->arch.vr.vscr.u[3] = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_VSRS(32)... KVMPPC_GSID_VSRS(63):
i = iden - KVMPPC_GSID_VSRS(32);
kvmppc_gse_get_vector128(gse, &vcpu->arch.vr.vr[i]);
break;
#endif
case KVMPPC_GSID_HDAR:
vcpu->arch.fault_dar = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_HDSISR:
vcpu->arch.fault_dsisr = kvmppc_gse_get_u32(gse);
break;
case KVMPPC_GSID_ASDR:
vcpu->arch.fault_gpa = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_HEIR:
vcpu->arch.emul_inst = kvmppc_gse_get_u64(gse);
break;
case KVMPPC_GSID_DEC_EXPIRY_TB: {
u64 dw;
dw = kvmppc_gse_get_u64(gse);
vcpu->arch.dec_expires =
dw + vcpu->arch.vcore->tb_offset;
break;
}
case KVMPPC_GSID_LOGICAL_PVR:
vcpu->arch.vcore->arch_compat = kvmppc_gse_get_u32(gse);
break;
default:
continue;
}
kvmppc_gsbm_set(valids, iden);
}
return 0;
}
static struct kvmppc_gs_msg_ops vcpu_message_ops = {
.get_size = gs_msg_ops_vcpu_get_size,
.fill_info = gs_msg_ops_vcpu_fill_info,
.refresh_info = gs_msg_ops_vcpu_refresh_info,
};
static int kvmhv_nestedv2_host_create(struct kvm_vcpu *vcpu,
struct kvmhv_nestedv2_io *io)
{
struct kvmhv_nestedv2_config *cfg;
struct kvmppc_gs_buff *gsb, *vcpu_run_output, *vcpu_run_input;
unsigned long guest_id, vcpu_id;
struct kvmppc_gs_msg *gsm, *vcpu_message, *vcore_message;
int rc;
cfg = &io->cfg;
guest_id = vcpu->kvm->arch.lpid;
vcpu_id = vcpu->vcpu_id;
gsm = kvmppc_gsm_new(&config_msg_ops, cfg, KVMPPC_GS_FLAGS_WIDE,
GFP_KERNEL);
if (!gsm) {
rc = -ENOMEM;
goto err;
}
gsb = kvmppc_gsb_new(kvmppc_gsm_size(gsm), guest_id, vcpu_id,
GFP_KERNEL);
if (!gsb) {
rc = -ENOMEM;
goto free_gsm;
}
rc = kvmppc_gsb_receive_datum(gsb, gsm,
KVMPPC_GSID_RUN_OUTPUT_MIN_SIZE);
if (rc < 0) {
pr_err("KVM-NESTEDv2: couldn't get vcpu run output buffer minimum size\n");
goto free_gsb;
}
vcpu_run_output = kvmppc_gsb_new(cfg->vcpu_run_output_size, guest_id,
vcpu_id, GFP_KERNEL);
if (!vcpu_run_output) {
rc = -ENOMEM;
goto free_gsb;
}
cfg->vcpu_run_output_cfg.address = kvmppc_gsb_paddress(vcpu_run_output);
cfg->vcpu_run_output_cfg.size = kvmppc_gsb_capacity(vcpu_run_output);
io->vcpu_run_output = vcpu_run_output;
gsm->flags = 0;
rc = kvmppc_gsb_send_datum(gsb, gsm, KVMPPC_GSID_RUN_OUTPUT);
if (rc < 0) {
pr_err("KVM-NESTEDv2: couldn't set vcpu run output buffer\n");
goto free_gs_out;
}
vcpu_message = kvmppc_gsm_new(&vcpu_message_ops, vcpu, 0, GFP_KERNEL);
if (!vcpu_message) {
rc = -ENOMEM;
goto free_gs_out;
}
kvmppc_gsm_include_all(vcpu_message);
io->vcpu_message = vcpu_message;
vcpu_run_input = kvmppc_gsb_new(kvmppc_gsm_size(vcpu_message), guest_id,
vcpu_id, GFP_KERNEL);
if (!vcpu_run_input) {
rc = -ENOMEM;
goto free_vcpu_message;
}
io->vcpu_run_input = vcpu_run_input;
cfg->vcpu_run_input_cfg.address = kvmppc_gsb_paddress(vcpu_run_input);
cfg->vcpu_run_input_cfg.size = kvmppc_gsb_capacity(vcpu_run_input);
rc = kvmppc_gsb_send_datum(gsb, gsm, KVMPPC_GSID_RUN_INPUT);
if (rc < 0) {
pr_err("KVM-NESTEDv2: couldn't set vcpu run input buffer\n");
goto free_vcpu_run_input;
}
vcore_message = kvmppc_gsm_new(&vcpu_message_ops, vcpu,
KVMPPC_GS_FLAGS_WIDE, GFP_KERNEL);
if (!vcore_message) {
rc = -ENOMEM;
goto free_vcpu_run_input;
}
kvmppc_gsm_include_all(vcore_message);
kvmppc_gsbm_clear(&vcore_message->bitmap, KVMPPC_GSID_LOGICAL_PVR);
io->vcore_message = vcore_message;
kvmppc_gsbm_fill(&io->valids);
kvmppc_gsm_free(gsm);
kvmppc_gsb_free(gsb);
return 0;
free_vcpu_run_input:
kvmppc_gsb_free(vcpu_run_input);
free_vcpu_message:
kvmppc_gsm_free(vcpu_message);
free_gs_out:
kvmppc_gsb_free(vcpu_run_output);
free_gsb:
kvmppc_gsb_free(gsb);
free_gsm:
kvmppc_gsm_free(gsm);
err:
return rc;
}
/**
* __kvmhv_nestedv2_mark_dirty() - mark a Guest State ID to be sent to the host
* @vcpu: vcpu
* @iden: guest state ID
*
* Mark a guest state ID as having been changed by the L1 host and thus
* the new value must be sent to the L0 hypervisor. See kvmhv_nestedv2_flush_vcpu()
*/
int __kvmhv_nestedv2_mark_dirty(struct kvm_vcpu *vcpu, u16 iden)
{
struct kvmhv_nestedv2_io *io;
struct kvmppc_gs_bitmap *valids;
struct kvmppc_gs_msg *gsm;
if (!iden)
return 0;
io = &vcpu->arch.nestedv2_io;
valids = &io->valids;
gsm = io->vcpu_message;
kvmppc_gsm_include(gsm, iden);
gsm = io->vcore_message;
kvmppc_gsm_include(gsm, iden);
kvmppc_gsbm_set(valids, iden);
return 0;
}
EXPORT_SYMBOL_GPL(__kvmhv_nestedv2_mark_dirty);
/**
* __kvmhv_nestedv2_cached_reload() - reload a Guest State ID from the host
* @vcpu: vcpu
* @iden: guest state ID
*
* Reload the value for the guest state ID from the L0 host into the L1 host.
* This is cached so that going out to the L0 host only happens if necessary.
*/
int __kvmhv_nestedv2_cached_reload(struct kvm_vcpu *vcpu, u16 iden)
{
struct kvmhv_nestedv2_io *io;
struct kvmppc_gs_bitmap *valids;
struct kvmppc_gs_buff *gsb;
struct kvmppc_gs_msg gsm;
int rc;
if (!iden)
return 0;
io = &vcpu->arch.nestedv2_io;
valids = &io->valids;
if (kvmppc_gsbm_test(valids, iden))
return 0;
gsb = io->vcpu_run_input;
kvmppc_gsm_init(&gsm, &vcpu_message_ops, vcpu, kvmppc_gsid_flags(iden));
rc = kvmppc_gsb_receive_datum(gsb, &gsm, iden);
if (rc < 0) {
pr_err("KVM-NESTEDv2: couldn't get GSID: 0x%x\n", iden);
return rc;
}
return 0;
}
EXPORT_SYMBOL_GPL(__kvmhv_nestedv2_cached_reload);
/**
* kvmhv_nestedv2_flush_vcpu() - send modified Guest State IDs to the host
* @vcpu: vcpu
* @time_limit: hdec expiry tb
*
* Send the values marked by __kvmhv_nestedv2_mark_dirty() to the L0 host.
* Thread wide values are copied to the H_GUEST_RUN_VCPU input buffer. Guest
* wide values need to be sent with H_GUEST_SET first.
*
* The hdec tb offset is always sent to L0 host.
*/
int kvmhv_nestedv2_flush_vcpu(struct kvm_vcpu *vcpu, u64 time_limit)
{
struct kvmhv_nestedv2_io *io;
struct kvmppc_gs_buff *gsb;
struct kvmppc_gs_msg *gsm;
int rc;
io = &vcpu->arch.nestedv2_io;
gsb = io->vcpu_run_input;
gsm = io->vcore_message;
rc = kvmppc_gsb_send_data(gsb, gsm);
if (rc < 0) {
pr_err("KVM-NESTEDv2: couldn't set guest wide elements\n");
return rc;
}
gsm = io->vcpu_message;
kvmppc_gsb_reset(gsb);
rc = kvmppc_gsm_fill_info(gsm, gsb);
if (rc < 0) {
pr_err("KVM-NESTEDv2: couldn't fill vcpu run input buffer\n");
return rc;
}
rc = kvmppc_gse_put_u64(gsb, KVMPPC_GSID_HDEC_EXPIRY_TB, time_limit);
if (rc < 0)
return rc;
return 0;
}
EXPORT_SYMBOL_GPL(kvmhv_nestedv2_flush_vcpu);
/**
* kvmhv_nestedv2_set_ptbl_entry() - send partition and process table state to
* L0 host
* @lpid: guest id
* @dw0: partition table double word
* @dw1: process table double word
*/
int kvmhv_nestedv2_set_ptbl_entry(unsigned long lpid, u64 dw0, u64 dw1)
{
struct kvmppc_gs_part_table patbl;
struct kvmppc_gs_proc_table prtbl;
struct kvmppc_gs_buff *gsb;
size_t size;
int rc;
size = kvmppc_gse_total_size(
kvmppc_gsid_size(KVMPPC_GSID_PARTITION_TABLE)) +
kvmppc_gse_total_size(
kvmppc_gsid_size(KVMPPC_GSID_PROCESS_TABLE)) +
sizeof(struct kvmppc_gs_header);
gsb = kvmppc_gsb_new(size, lpid, 0, GFP_KERNEL);
if (!gsb)
return -ENOMEM;
patbl.address = dw0 & RPDB_MASK;
patbl.ea_bits = ((((dw0 & RTS1_MASK) >> (RTS1_SHIFT - 3)) |
((dw0 & RTS2_MASK) >> RTS2_SHIFT)) +
31);
patbl.gpd_size = 1ul << ((dw0 & RPDS_MASK) + 3);
rc = kvmppc_gse_put_part_table(gsb, KVMPPC_GSID_PARTITION_TABLE, patbl);
if (rc < 0)
goto free_gsb;
prtbl.address = dw1 & PRTB_MASK;
prtbl.gpd_size = 1ul << ((dw1 & PRTS_MASK) + 12);
rc = kvmppc_gse_put_proc_table(gsb, KVMPPC_GSID_PROCESS_TABLE, prtbl);
if (rc < 0)
goto free_gsb;
rc = kvmppc_gsb_send(gsb, KVMPPC_GS_FLAGS_WIDE);
if (rc < 0) {
pr_err("KVM-NESTEDv2: couldn't set the PATE\n");
goto free_gsb;
}
kvmppc_gsb_free(gsb);
return 0;
free_gsb:
kvmppc_gsb_free(gsb);
return rc;
}
EXPORT_SYMBOL_GPL(kvmhv_nestedv2_set_ptbl_entry);
/**
* kvmhv_nestedv2_set_vpa() - register L2 VPA with L0
* @vcpu: vcpu
* @vpa: L1 logical real address
*/
int kvmhv_nestedv2_set_vpa(struct kvm_vcpu *vcpu, unsigned long vpa)
{
struct kvmhv_nestedv2_io *io;
struct kvmppc_gs_buff *gsb;
int rc = 0;
io = &vcpu->arch.nestedv2_io;
gsb = io->vcpu_run_input;
kvmppc_gsb_reset(gsb);
rc = kvmppc_gse_put_u64(gsb, KVMPPC_GSID_VPA, vpa);
if (rc < 0)
goto out;
rc = kvmppc_gsb_send(gsb, 0);
if (rc < 0)
pr_err("KVM-NESTEDv2: couldn't register the L2 VPA (rc=%d)\n", rc);
out:
kvmppc_gsb_reset(gsb);
return rc;
}
EXPORT_SYMBOL_GPL(kvmhv_nestedv2_set_vpa);
/**
* kvmhv_nestedv2_parse_output() - receive values from H_GUEST_RUN_VCPU output
* @vcpu: vcpu
*
* Parse the output buffer from H_GUEST_RUN_VCPU to update vcpu.
*/
int kvmhv_nestedv2_parse_output(struct kvm_vcpu *vcpu)
{
struct kvmhv_nestedv2_io *io;
struct kvmppc_gs_buff *gsb;
struct kvmppc_gs_msg gsm;
io = &vcpu->arch.nestedv2_io;
gsb = io->vcpu_run_output;
vcpu->arch.fault_dar = 0;
vcpu->arch.fault_dsisr = 0;
vcpu->arch.fault_gpa = 0;
vcpu->arch.emul_inst = KVM_INST_FETCH_FAILED;
kvmppc_gsm_init(&gsm, &vcpu_message_ops, vcpu, 0);
return kvmppc_gsm_refresh_info(&gsm, gsb);
}
EXPORT_SYMBOL_GPL(kvmhv_nestedv2_parse_output);
static void kvmhv_nestedv2_host_free(struct kvm_vcpu *vcpu,
struct kvmhv_nestedv2_io *io)
{
kvmppc_gsm_free(io->vcpu_message);
kvmppc_gsm_free(io->vcore_message);
kvmppc_gsb_free(io->vcpu_run_input);
kvmppc_gsb_free(io->vcpu_run_output);
}
int __kvmhv_nestedv2_reload_ptregs(struct kvm_vcpu *vcpu, struct pt_regs *regs)
{
struct kvmhv_nestedv2_io *io;
struct kvmppc_gs_bitmap *valids;
struct kvmppc_gs_buff *gsb;
struct kvmppc_gs_msg gsm;
int rc = 0;
io = &vcpu->arch.nestedv2_io;
valids = &io->valids;
gsb = io->vcpu_run_input;
kvmppc_gsm_init(&gsm, &vcpu_message_ops, vcpu, 0);
for (int i = 0; i < 32; i++) {
if (!kvmppc_gsbm_test(valids, KVMPPC_GSID_GPR(i)))
kvmppc_gsm_include(&gsm, KVMPPC_GSID_GPR(i));
}
if (!kvmppc_gsbm_test(valids, KVMPPC_GSID_CR))
kvmppc_gsm_include(&gsm, KVMPPC_GSID_CR);
if (!kvmppc_gsbm_test(valids, KVMPPC_GSID_XER))
kvmppc_gsm_include(&gsm, KVMPPC_GSID_XER);
if (!kvmppc_gsbm_test(valids, KVMPPC_GSID_CTR))
kvmppc_gsm_include(&gsm, KVMPPC_GSID_CTR);
if (!kvmppc_gsbm_test(valids, KVMPPC_GSID_LR))
kvmppc_gsm_include(&gsm, KVMPPC_GSID_LR);
if (!kvmppc_gsbm_test(valids, KVMPPC_GSID_NIA))
kvmppc_gsm_include(&gsm, KVMPPC_GSID_NIA);
rc = kvmppc_gsb_receive_data(gsb, &gsm);
if (rc < 0)
pr_err("KVM-NESTEDv2: couldn't reload ptregs\n");
return rc;
}
EXPORT_SYMBOL_GPL(__kvmhv_nestedv2_reload_ptregs);
int __kvmhv_nestedv2_mark_dirty_ptregs(struct kvm_vcpu *vcpu,
struct pt_regs *regs)
{
for (int i = 0; i < 32; i++)
kvmhv_nestedv2_mark_dirty(vcpu, KVMPPC_GSID_GPR(i));
kvmhv_nestedv2_mark_dirty(vcpu, KVMPPC_GSID_CR);
kvmhv_nestedv2_mark_dirty(vcpu, KVMPPC_GSID_XER);
kvmhv_nestedv2_mark_dirty(vcpu, KVMPPC_GSID_CTR);
kvmhv_nestedv2_mark_dirty(vcpu, KVMPPC_GSID_LR);
kvmhv_nestedv2_mark_dirty(vcpu, KVMPPC_GSID_NIA);
return 0;
}
EXPORT_SYMBOL_GPL(__kvmhv_nestedv2_mark_dirty_ptregs);
/**
* kvmhv_nestedv2_vcpu_create() - create nested vcpu for the NESTEDv2 API
* @vcpu: vcpu
* @io: NESTEDv2 nested io state
*
* Parse the output buffer from H_GUEST_RUN_VCPU to update vcpu.
*/
int kvmhv_nestedv2_vcpu_create(struct kvm_vcpu *vcpu,
struct kvmhv_nestedv2_io *io)
{
long rc;
rc = plpar_guest_create_vcpu(0, vcpu->kvm->arch.lpid, vcpu->vcpu_id);
if (rc != H_SUCCESS) {
pr_err("KVM: Create Guest vcpu hcall failed, rc=%ld\n", rc);
switch (rc) {
case H_NOT_ENOUGH_RESOURCES:
case H_ABORTED:
return -ENOMEM;
case H_AUTHORITY:
return -EPERM;
default:
return -EINVAL;
}
}
rc = kvmhv_nestedv2_host_create(vcpu, io);
return rc;
}
EXPORT_SYMBOL_GPL(kvmhv_nestedv2_vcpu_create);
/**
* kvmhv_nestedv2_vcpu_free() - free the NESTEDv2 state
* @vcpu: vcpu
* @io: NESTEDv2 nested io state
*/
void kvmhv_nestedv2_vcpu_free(struct kvm_vcpu *vcpu,
struct kvmhv_nestedv2_io *io)
{
kvmhv_nestedv2_host_free(vcpu, io);
}
EXPORT_SYMBOL_GPL(kvmhv_nestedv2_vcpu_free);
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