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Message-Id: <1571912870-18471-1-git-send-email-shannon.zhao@linux.alibaba.com>
Date: Thu, 24 Oct 2019 18:27:43 +0800
From: Shannon Zhao <shannon.zhao@...ux.alibaba.com>
To: kvmarm@...ts.cs.columbia.edu, maz@...nel.org, james.morse@....com,
suzuki.poulose@....com, christoffer.dall@....com
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH RFC 0/7] Support KVM being compiled as a kernel module on arm64
Curently KVM ARM64 doesn't support to compile as a kernel module. It's
useful to compile KVM as a module. For example, it could reload kvm
without rebooting host machine.
This patchset support this feature while there are some limitations
to be solved. But I just send it out as RFC to get more suggestion and
comments.
The patchset could be fetched from:
https://github.com/shannonz88/linux/tree/kvm_module
Curently it only supports for VHE system due to the hyp code section
address variables like __hyp_text_start. Also it can't call
kvm_update_va_mask when loading kvm module and kernel panic with below
errors. So I make kern_hyp_va into a nop funtion.
Unable to handle kernel read from unreadable memory at virtual address
ffff800008eda580
Mem abort info:
ESR = 0x8600000f
EC = 0x21: IABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000000ca1000
[ffff800008eda580] pgd=00002057fffff003, pud=00002057ffffe003,
pmd=0000003799c63003, pte=00e800575140f713
Internal error: Oops: 8600000f [#1] SMP
CPU: 25 PID: 9307 Comm: insmod Tainted: G E 5.4.0-rc4+ #39
pstate: 60400009 (nZCv daif +PAN -UAO)
pc : 0xffff800008eda580
lr : __apply_alternatives+0x130/0x26c
sp : ffff800022fdbb00
x29: ffff800022fdbb00 x28: ffff800008f105bc
x27: 0000000000000005 x26: ffff800008f105bc
x25: ffff800010b67dd0 x24: ffff800008eda580
x23: ffff800010f21eff x22: ffff800022fdbba8
x21: 0000000000000001 x20: ffff800022fdbba0
x19: ffff800008f232bc x18: ffff00379b437d90
x17: 0000000000000000 x16: 0000000000009000
x15: 0000000000000008 x14: 0000000000000a00
x13: 0000000000000001 x12: ffff205768d18010
x11: 00000000ffffffff x10: 0000000000aaaaaa
x9 : ffff8000109b0cc8 x8 : 0000000000000001
x7 : ffff00579f9391a8 x6 : 0000000000000001
x5 : 0000000000000000 x4 : 0000000000000000
x3 : 0000000000000005 x2 : ffff800008f105bc
x1 : ffff800008f105bc x0 : ffff800008f232bc
Call trace:
0xffff800008eda580
apply_alternatives_module+0x64/0x84
module_finalize+0xa8/0xd0
load_module+0xf88/0x1b34
__do_sys_finit_module+0xd0/0xfc
__arm64_sys_finit_module+0x28/0x34
el0_svc_handler+0x120/0x1d4
el0_svc+0x8/0xc
Code: d34b2c00 17ffffea d4000002 d65f03c0 (a9ba7bfd)
---[ end trace 6de8ebc787a78157 ]---
Kernel panic - not syncing: Fatal exception
SMP: stopping secondary CPUs
Shannon Zhao (7):
KVM: ARM: call hyp_cpu_pm_exit on correct fail and exit path
KVM: arch_timer: Fix resource leak on error path
KVM: vgic: make vgic parameters work well for module
KVM: vgic: Add hyp uninitialize function
KVM: arch_timer: Add hyp uninitialize function
KVM: arm/arm64: Move target table register into register table init
function
KVM: ARM: Support KVM being compiled as a kernel module
arch/arm/kvm/coproc.c | 3 ++
arch/arm/kvm/coproc.h | 3 ++
arch/arm/kvm/coproc_a15.c | 4 +--
arch/arm/kvm/coproc_a7.c | 4 +--
arch/arm64/include/asm/cache.h | 16 ++---------
arch/arm64/include/asm/cpufeature.h | 11 +-------
arch/arm64/include/asm/fpsimd.h | 6 +---
arch/arm64/include/asm/kvm_host.h | 3 --
arch/arm64/include/asm/kvm_mmu.h | 4 +++
arch/arm64/include/asm/perf_event.h | 2 ++
arch/arm64/kernel/acpi.c | 1 +
arch/arm64/kernel/asm-offsets.c | 2 +-
arch/arm64/kernel/cpu_errata.c | 15 +++++++++-
arch/arm64/kernel/cpufeature.c | 2 ++
arch/arm64/kernel/cpuinfo.c | 16 +++++++++++
arch/arm64/kernel/entry-fpsimd.S | 2 ++
arch/arm64/kernel/entry.S | 1 +
arch/arm64/kernel/fpsimd.c | 11 ++++++++
arch/arm64/kernel/head.S | 1 +
arch/arm64/kernel/hibernate.c | 6 ++++
arch/arm64/kernel/hyp-stub.S | 1 +
arch/arm64/kernel/insn.c | 2 ++
arch/arm64/kernel/perf_event.c | 19 +++++++++++--
arch/arm64/kernel/probes/kprobes.c | 2 ++
arch/arm64/kernel/smp.c | 1 +
arch/arm64/kernel/traps.c | 2 ++
arch/arm64/kvm/Kconfig | 19 ++++++++++---
arch/arm64/kvm/Makefile | 53 ++++++++++++++++++++----------------
arch/arm64/kvm/hyp/Makefile | 22 +++++++--------
arch/arm64/kvm/sys_regs.c | 1 +
arch/arm64/kvm/sys_regs.h | 2 ++
arch/arm64/kvm/sys_regs_generic_v8.c | 5 +---
arch/arm64/kvm/va_layout.c | 7 ++++-
arch/arm64/mm/cache.S | 2 ++
arch/arm64/mm/hugetlbpage.c | 2 ++
arch/arm64/mm/mmu.c | 4 +++
drivers/clocksource/arm_arch_timer.c | 1 +
drivers/irqchip/irq-gic-common.c | 1 +
drivers/irqchip/irq-gic-v4.c | 8 ++++++
include/kvm/arm_arch_timer.h | 1 +
include/kvm/arm_vgic.h | 1 +
include/linux/interrupt.h | 6 +---
kernel/irq/manage.c | 6 ++++
mm/pgtable-generic.c | 1 +
virt/kvm/arm/arch_timer.c | 19 +++++++++++--
virt/kvm/arm/arm.c | 41 ++++++++++++++++++++++++++--
virt/kvm/arm/mmu.c | 4 +++
virt/kvm/arm/vgic/vgic-init.c | 7 +++++
virt/kvm/arm/vgic/vgic-v3.c | 7 +++++
49 files changed, 264 insertions(+), 96 deletions(-)
--
1.8.3.1
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