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authorMarc Zyngier <maz@kernel.org>2020-01-24 22:42:15 +0000
committerMarc Zyngier <maz@kernel.org>2020-03-24 10:56:04 +0000
commit541ad0150ca4aa663a2dcb9c834ab493168fe494 (patch)
tree59700888be226a8ce0a67b30b14a057c229a3841 /arch/arm/kvm/init.S
parentbb7c62bcb8488e198bdc4ea8e991de0b59770632 (diff)
arm: Remove 32bit KVM host support
That's it. Remove all references to KVM itself, and document that although it is no more, the ABI between SVC and HYP still exists. Signed-off-by: Marc Zyngier <maz@kernel.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Will Deacon <will@kernel.org> Acked-by: Vladimir Murzin <vladimir.murzin@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Diffstat (limited to 'arch/arm/kvm/init.S')
-rw-r--r--arch/arm/kvm/init.S157
1 files changed, 0 insertions, 157 deletions
diff --git a/arch/arm/kvm/init.S b/arch/arm/kvm/init.S
deleted file mode 100644
index 33e34b6d24b2..000000000000
--- a/arch/arm/kvm/init.S
+++ /dev/null
@@ -1,157 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2012 - Virtual Open Systems and Columbia University
- * Author: Christoffer Dall <c.dall@virtualopensystems.com>
- */
-
-#include <linux/linkage.h>
-#include <asm/assembler.h>
-#include <asm/unified.h>
-#include <asm/asm-offsets.h>
-#include <asm/kvm_asm.h>
-#include <asm/kvm_arm.h>
-#include <asm/kvm_mmu.h>
-#include <asm/virt.h>
-
-/********************************************************************
- * Hypervisor initialization
- * - should be called with:
- * r0 = top of Hyp stack (kernel VA)
- * r1 = pointer to hyp vectors
- * r2,r3 = Hypervisor pgd pointer
- *
- * The init scenario is:
- * - We jump in HYP with 3 parameters: runtime HYP pgd, runtime stack,
- * runtime vectors
- * - Invalidate TLBs
- * - Set stack and vectors
- * - Setup the page tables
- * - Enable the MMU
- * - Profit! (or eret, if you only care about the code).
- *
- * Another possibility is to get a HYP stub hypercall.
- * We discriminate between the two by checking if r0 contains a value
- * that is less than HVC_STUB_HCALL_NR.
- */
-
- .text
- .pushsection .hyp.idmap.text,"ax"
- .align 5
-__kvm_hyp_init:
- .globl __kvm_hyp_init
-
- @ Hyp-mode exception vector
- W(b) .
- W(b) .
- W(b) .
- W(b) .
- W(b) .
- W(b) __do_hyp_init
- W(b) .
- W(b) .
-
-__do_hyp_init:
- @ Check for a stub hypercall
- cmp r0, #HVC_STUB_HCALL_NR
- blo __kvm_handle_stub_hvc
-
- @ Set stack pointer
- mov sp, r0
-
- @ Set HVBAR to point to the HYP vectors
- mcr p15, 4, r1, c12, c0, 0 @ HVBAR
-
- @ Set the HTTBR to point to the hypervisor PGD pointer passed
- mcrr p15, 4, rr_lo_hi(r2, r3), c2
-
- @ Set the HTCR and VTCR to the same shareability and cacheability
- @ settings as the non-secure TTBCR and with T0SZ == 0.
- mrc p15, 4, r0, c2, c0, 2 @ HTCR
- ldr r2, =HTCR_MASK
- bic r0, r0, r2
- mrc p15, 0, r1, c2, c0, 2 @ TTBCR
- and r1, r1, #(HTCR_MASK & ~TTBCR_T0SZ)
- orr r0, r0, r1
- mcr p15, 4, r0, c2, c0, 2 @ HTCR
-
- @ Use the same memory attributes for hyp. accesses as the kernel
- @ (copy MAIRx ro HMAIRx).
- mrc p15, 0, r0, c10, c2, 0
- mcr p15, 4, r0, c10, c2, 0
- mrc p15, 0, r0, c10, c2, 1
- mcr p15, 4, r0, c10, c2, 1
-
- @ Invalidate the stale TLBs from Bootloader
- mcr p15, 4, r0, c8, c7, 0 @ TLBIALLH
- dsb ish
-
- @ Set the HSCTLR to:
- @ - ARM/THUMB exceptions: Kernel config (Thumb-2 kernel)
- @ - Endianness: Kernel config
- @ - Fast Interrupt Features: Kernel config
- @ - Write permission implies XN: disabled
- @ - Instruction cache: enabled
- @ - Data/Unified cache: enabled
- @ - MMU: enabled (this code must be run from an identity mapping)
- mrc p15, 4, r0, c1, c0, 0 @ HSCR
- ldr r2, =HSCTLR_MASK
- bic r0, r0, r2
- mrc p15, 0, r1, c1, c0, 0 @ SCTLR
- ldr r2, =(HSCTLR_EE | HSCTLR_FI | HSCTLR_I | HSCTLR_C)
- and r1, r1, r2
- ARM( ldr r2, =(HSCTLR_M) )
- THUMB( ldr r2, =(HSCTLR_M | HSCTLR_TE) )
- orr r1, r1, r2
- orr r0, r0, r1
- mcr p15, 4, r0, c1, c0, 0 @ HSCR
- isb
-
- eret
-
-ENTRY(__kvm_handle_stub_hvc)
- cmp r0, #HVC_SOFT_RESTART
- bne 1f
-
- /* The target is expected in r1 */
- msr ELR_hyp, r1
- mrs r0, cpsr
- bic r0, r0, #MODE_MASK
- orr r0, r0, #HYP_MODE
-THUMB( orr r0, r0, #PSR_T_BIT )
- msr spsr_cxsf, r0
- b reset
-
-1: cmp r0, #HVC_RESET_VECTORS
- bne 1f
-
-reset:
- /* We're now in idmap, disable MMU */
- mrc p15, 4, r1, c1, c0, 0 @ HSCTLR
- ldr r0, =(HSCTLR_M | HSCTLR_A | HSCTLR_C | HSCTLR_I)
- bic r1, r1, r0
- mcr p15, 4, r1, c1, c0, 0 @ HSCTLR
-
- /*
- * Install stub vectors, using ardb's VA->PA trick.
- */
-0: adr r0, 0b @ PA(0)
- movw r1, #:lower16:__hyp_stub_vectors - 0b @ VA(stub) - VA(0)
- movt r1, #:upper16:__hyp_stub_vectors - 0b
- add r1, r1, r0 @ PA(stub)
- mcr p15, 4, r1, c12, c0, 0 @ HVBAR
- b exit
-
-1: ldr r0, =HVC_STUB_ERR
- eret
-
-exit:
- mov r0, #0
- eret
-ENDPROC(__kvm_handle_stub_hvc)
-
- .ltorg
-
- .globl __kvm_hyp_init_end
-__kvm_hyp_init_end:
-
- .popsection