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kernel-fxtec-pro1x/arch/arm64/include/asm/kvm_arm.h
Marc Zyngier 35307b9a5f arm/arm64: KVM: Implement Stage-2 page aging 
Until now, KVM/arm didn't care much for page aging (who was swapping
anyway?), and simply provided empty hooks to the core KVM code. With
server-type systems now being available, things are quite different.

This patch implements very simple support for page aging, by clearing
the Access flag in the Stage-2 page tables. On access fault, the current
fault handling will write the PTE or PMD again, putting the Access flag
back on.

It should be possible to implement a much faster handling for Access
faults, but that's left for a later patch.

With this in place, performance in VMs is degraded much more gracefully.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2015-03-12 22:34:43 +01:00

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/*
* Copyright (C) 2012,2013 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ARM64_KVM_ARM_H__
#define __ARM64_KVM_ARM_H__
#include <asm/esr.h>
#include <asm/memory.h>
#include <asm/types.h>
/* Hyp Configuration Register (HCR) bits */
#define HCR_ID (UL(1) << 33)
#define HCR_CD (UL(1) << 32)
#define HCR_RW_SHIFT 31
#define HCR_RW (UL(1) << HCR_RW_SHIFT)
#define HCR_TRVM (UL(1) << 30)
#define HCR_HCD (UL(1) << 29)
#define HCR_TDZ (UL(1) << 28)
#define HCR_TGE (UL(1) << 27)
#define HCR_TVM (UL(1) << 26)
#define HCR_TTLB (UL(1) << 25)
#define HCR_TPU (UL(1) << 24)
#define HCR_TPC (UL(1) << 23)
#define HCR_TSW (UL(1) << 22)
#define HCR_TAC (UL(1) << 21)
#define HCR_TIDCP (UL(1) << 20)
#define HCR_TSC (UL(1) << 19)
#define HCR_TID3 (UL(1) << 18)
#define HCR_TID2 (UL(1) << 17)
#define HCR_TID1 (UL(1) << 16)
#define HCR_TID0 (UL(1) << 15)
#define HCR_TWE (UL(1) << 14)
#define HCR_TWI (UL(1) << 13)
#define HCR_DC (UL(1) << 12)
#define HCR_BSU (3 << 10)
#define HCR_BSU_IS (UL(1) << 10)
#define HCR_FB (UL(1) << 9)
#define HCR_VA (UL(1) << 8)
#define HCR_VI (UL(1) << 7)
#define HCR_VF (UL(1) << 6)
#define HCR_AMO (UL(1) << 5)
#define HCR_IMO (UL(1) << 4)
#define HCR_FMO (UL(1) << 3)
#define HCR_PTW (UL(1) << 2)
#define HCR_SWIO (UL(1) << 1)
#define HCR_VM (UL(1) << 0)
/*
* The bits we set in HCR:
* RW: 64bit by default, can be overriden for 32bit VMs
* TAC: Trap ACTLR
* TSC: Trap SMC
* TVM: Trap VM ops (until M+C set in SCTLR_EL1)
* TSW: Trap cache operations by set/way
* TWE: Trap WFE
* TWI: Trap WFI
* TIDCP: Trap L2CTLR/L2ECTLR
* BSU_IS: Upgrade barriers to the inner shareable domain
* FB: Force broadcast of all maintainance operations
* AMO: Override CPSR.A and enable signaling with VA
* IMO: Override CPSR.I and enable signaling with VI
* FMO: Override CPSR.F and enable signaling with VF
* SWIO: Turn set/way invalidates into set/way clean+invalidate
*/
#define HCR_GUEST_FLAGS (HCR_TSC | HCR_TSW | HCR_TWE | HCR_TWI | HCR_VM | \
HCR_TVM | HCR_BSU_IS | HCR_FB | HCR_TAC | \
HCR_AMO | HCR_SWIO | HCR_TIDCP | HCR_RW)
#define HCR_VIRT_EXCP_MASK (HCR_VA | HCR_VI | HCR_VF)
#define HCR_INT_OVERRIDE (HCR_FMO | HCR_IMO)
/* Hyp System Control Register (SCTLR_EL2) bits */
#define SCTLR_EL2_EE (1 << 25)
#define SCTLR_EL2_WXN (1 << 19)
#define SCTLR_EL2_I (1 << 12)
#define SCTLR_EL2_SA (1 << 3)
#define SCTLR_EL2_C (1 << 2)
#define SCTLR_EL2_A (1 << 1)
#define SCTLR_EL2_M 1
#define SCTLR_EL2_FLAGS (SCTLR_EL2_M | SCTLR_EL2_A | SCTLR_EL2_C | \
SCTLR_EL2_SA | SCTLR_EL2_I)
/* TCR_EL2 Registers bits */
#define TCR_EL2_TBI (1 << 20)
#define TCR_EL2_PS (7 << 16)
#define TCR_EL2_PS_40B (2 << 16)
#define TCR_EL2_TG0 (1 << 14)
#define TCR_EL2_SH0 (3 << 12)
#define TCR_EL2_ORGN0 (3 << 10)
#define TCR_EL2_IRGN0 (3 << 8)
#define TCR_EL2_T0SZ 0x3f
#define TCR_EL2_MASK (TCR_EL2_TG0 | TCR_EL2_SH0 | \
TCR_EL2_ORGN0 | TCR_EL2_IRGN0 | TCR_EL2_T0SZ)
#define TCR_EL2_FLAGS (TCR_EL2_PS_40B)
/* VTCR_EL2 Registers bits */
#define VTCR_EL2_PS_MASK (7 << 16)
#define VTCR_EL2_TG0_MASK (1 << 14)
#define VTCR_EL2_TG0_4K (0 << 14)
#define VTCR_EL2_TG0_64K (1 << 14)
#define VTCR_EL2_SH0_MASK (3 << 12)
#define VTCR_EL2_SH0_INNER (3 << 12)
#define VTCR_EL2_ORGN0_MASK (3 << 10)
#define VTCR_EL2_ORGN0_WBWA (1 << 10)
#define VTCR_EL2_IRGN0_MASK (3 << 8)
#define VTCR_EL2_IRGN0_WBWA (1 << 8)
#define VTCR_EL2_SL0_MASK (3 << 6)
#define VTCR_EL2_SL0_LVL1 (1 << 6)
#define VTCR_EL2_T0SZ_MASK 0x3f
#define VTCR_EL2_T0SZ_40B 24
/*
* We configure the Stage-2 page tables to always restrict the IPA space to be
* 40 bits wide (T0SZ = 24). Systems with a PARange smaller than 40 bits are
* not known to exist and will break with this configuration.
*
* Note that when using 4K pages, we concatenate two first level page tables
* together.
*
* The magic numbers used for VTTBR_X in this patch can be found in Tables
* D4-23 and D4-25 in ARM DDI 0487A.b.
*/
#ifdef CONFIG_ARM64_64K_PAGES
/*
* Stage2 translation configuration:
* 40bits output (PS = 2)
* 40bits input (T0SZ = 24)
* 64kB pages (TG0 = 1)
* 2 level page tables (SL = 1)
*/
#define VTCR_EL2_FLAGS (VTCR_EL2_TG0_64K | VTCR_EL2_SH0_INNER | \
VTCR_EL2_ORGN0_WBWA | VTCR_EL2_IRGN0_WBWA | \
VTCR_EL2_SL0_LVL1 | VTCR_EL2_T0SZ_40B)
#define VTTBR_X (38 - VTCR_EL2_T0SZ_40B)
#else
/*
* Stage2 translation configuration:
* 40bits output (PS = 2)
* 40bits input (T0SZ = 24)
* 4kB pages (TG0 = 0)
* 3 level page tables (SL = 1)
*/
#define VTCR_EL2_FLAGS (VTCR_EL2_TG0_4K | VTCR_EL2_SH0_INNER | \
VTCR_EL2_ORGN0_WBWA | VTCR_EL2_IRGN0_WBWA | \
VTCR_EL2_SL0_LVL1 | VTCR_EL2_T0SZ_40B)
#define VTTBR_X (37 - VTCR_EL2_T0SZ_40B)
#endif
#define VTTBR_BADDR_SHIFT (VTTBR_X - 1)
#define VTTBR_BADDR_MASK (((UL(1) << (PHYS_MASK_SHIFT - VTTBR_X)) - 1) << VTTBR_BADDR_SHIFT)
#define VTTBR_VMID_SHIFT (UL(48))
#define VTTBR_VMID_MASK (UL(0xFF) << VTTBR_VMID_SHIFT)
/* Hyp System Trap Register */
#define HSTR_EL2_TTEE (1 << 16)
#define HSTR_EL2_T(x) (1 << x)
/* Hyp Coprocessor Trap Register */
#define CPTR_EL2_TCPAC (1 << 31)
#define CPTR_EL2_TTA (1 << 20)
#define CPTR_EL2_TFP (1 << 10)
/* Hyp Debug Configuration Register bits */
#define MDCR_EL2_TDRA (1 << 11)
#define MDCR_EL2_TDOSA (1 << 10)
#define MDCR_EL2_TDA (1 << 9)
#define MDCR_EL2_TDE (1 << 8)
#define MDCR_EL2_HPME (1 << 7)
#define MDCR_EL2_TPM (1 << 6)
#define MDCR_EL2_TPMCR (1 << 5)
#define MDCR_EL2_HPMN_MASK (0x1F)
/* For compatibility with fault code shared with 32-bit */
#define FSC_FAULT ESR_ELx_FSC_FAULT
#define FSC_ACCESS ESR_ELx_FSC_ACCESS
#define FSC_PERM ESR_ELx_FSC_PERM
/* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
#define HPFAR_MASK (~UL(0xf))
#endif /* __ARM64_KVM_ARM_H__ */
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