| From: |
| Bibo Mao <maobibo-AT-loongson.cn> |
| To: |
| Tianrui Zhao <zhaotianrui-AT-loongson.cn>, Huacai Chen <chenhuacai-AT-kernel.org> |
| Subject: |
| [PATCH v5 0/3] LoongArch: KVM: Add Binary Translation extension support |
| Date: |
| Thu, 25 Jul 2024 11:34:01 +0800 |
| Message-ID: |
| <20240725033404.2675204-1-maobibo@loongson.cn> |
| Cc: |
| WANG Xuerui <kernel-AT-xen0n.name>, kvm-AT-vger.kernel.org, loongarch-AT-lists.linux.dev, linux-kernel-AT-vger.kernel.org, Jiaxun Yang <jiaxun.yang-AT-flygoat.com> |
| Archive-link: |
| Article |
Loongson Binary Translation (LBT) is used to accelerate binary
translation, which contains 4 scratch registers (scr0 to scr3), x86/ARM
eflags (eflags) and x87 fpu stack pointer (ftop).
Like FPU extension, here lately enabling method is used for LBT. LBT
context is saved/restored during vcpu context switch path.
Also this patch set LBT capability detection, and LBT register get/set
interface for userspace vmm, so that vm supports migration with BT
extension.
---
v4 ... v5:
1. Add feature detection for LSX/LASX from vm side, previously
LSX/LASX feature is detected from vcpu ioctl command, now both methods
are supported.
v3 ... v4:
1. Merge LBT feature detection for VM and VCPU into one patch.
2. Move function declaration such as kvm_lose_lbt()/kvm_check_fcsr()/
kvm_enable_lbt_fpu() from header file to c file, since it is only
used in one c file.
v2 ... v3:
1. Split KVM_LOONGARCH_VM_FEAT_LBT capability checking into three
sub-features, KVM_LOONGARCH_VM_FEAT_X86BT/KVM_LOONGARCH_VM_FEAT_ARMBT
and KVM_LOONGARCH_VM_FEAT_MIPSBT. Return success only if host supports
the sub-feature.
v1 ... v2:
1. With LBT register read or write interface to userpace, replace
device attr method with KVM_GET_ONE_REG method, since lbt register is
vcpu register and can be added in kvm_reg_list in future.
2. Add vm device attr ctrl marcro KVM_LOONGARCH_VM_FEAT_CTRL, it is
used to get supported LBT feature before vm or vcpu is created.
---
Bibo Mao (3):
LoongArch: KVM: Add HW Binary Translation extension support
LoongArch: KVM: Add LBT feature detection function
LoongArch: KVM: Add vm migration support for LBT registers
arch/loongarch/include/asm/kvm_host.h | 8 ++
arch/loongarch/include/asm/kvm_vcpu.h | 6 ++
arch/loongarch/include/uapi/asm/kvm.h | 17 ++++
arch/loongarch/kvm/exit.c | 9 ++
arch/loongarch/kvm/vcpu.c | 126 +++++++++++++++++++++++++-
arch/loongarch/kvm/vm.c | 52 ++++++++++-
6 files changed, 216 insertions(+), 2 deletions(-)
base-commit: c33ffdb70cc6df4105160f991288e7d2567d7ffa
--
2.39.3
