kernel_optimize_test/arch
Jay Zhou e895a39a2b KVM: x86: get smi pending status correctly
commit 1f7becf1b7e21794fc9d460765fe09679bc9b9e0 upstream.

The injection process of smi has two steps:

    Qemu                        KVM
Step1:
    cpu->interrupt_request &= \
        ~CPU_INTERRUPT_SMI;
    kvm_vcpu_ioctl(cpu, KVM_SMI)

                                call kvm_vcpu_ioctl_smi() and
                                kvm_make_request(KVM_REQ_SMI, vcpu);

Step2:
    kvm_vcpu_ioctl(cpu, KVM_RUN, 0)

                                call process_smi() if
                                kvm_check_request(KVM_REQ_SMI, vcpu) is
                                true, mark vcpu->arch.smi_pending = true;

The vcpu->arch.smi_pending will be set true in step2, unfortunately if
vcpu paused between step1 and step2, the kvm_run->immediate_exit will be
set and vcpu has to exit to Qemu immediately during step2 before mark
vcpu->arch.smi_pending true.
During VM migration, Qemu will get the smi pending status from KVM using
KVM_GET_VCPU_EVENTS ioctl at the downtime, then the smi pending status
will be lost.

Signed-off-by: Jay Zhou <jianjay.zhou@huawei.com>
Signed-off-by: Shengen Zhuang <zhuangshengen@huawei.com>
Message-Id: <20210118084720.1585-1-jianjay.zhou@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-02-03 23:28:41 +01:00
..
alpha local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
arc arch/arc: add copy_user_page() to <asm/page.h> to fix build error on ARC 2021-01-19 18:27:26 +01:00
arm ARM: dts: imx6qdl-gw52xx: fix duplicate regulator naming 2021-02-03 23:28:38 +01:00
arm64 KVM: arm64: Filter out v8.1+ events on v8.0 HW 2021-02-03 23:28:41 +01:00
c6x
csky local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
h8300 local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
hexagon local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
ia64 local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
m68k local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
microblaze local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
mips MIPS: relocatable: fix possible boot hangup with KASLR enabled 2021-01-19 18:27:20 +01:00
nds32 local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
nios2
openrisc
parisc parisc: Enable -mlong-calls gcc option by default when !CONFIG_MODULES 2021-02-03 23:28:37 +01:00
powerpc powerpc/64s: fix scv entry fallback flush vs interrupt 2021-01-27 11:55:12 +01:00
riscv RISC-V: Fix maximum allowed phsyical memory for RV32 2021-01-27 11:55:04 +01:00
s390 s390: uv: Fix sysfs max number of VCPUs reporting 2021-02-03 23:28:39 +01:00
sh sh: Remove unused HAVE_COPY_THREAD_TLS macro 2021-01-27 11:55:20 +01:00
sparc local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
um um: ubd: Submit all data segments atomically 2021-01-06 14:56:55 +01:00
x86 KVM: x86: get smi pending status correctly 2021-02-03 23:28:41 +01:00
xtensa local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
.gitignore
Kconfig fanotify: Fix sys_fanotify_mark() on native x86-32 2021-01-17 14:16:59 +01:00