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SubjectRe: [PATCH 12/45] KVM: x86: Support for user space injected NMIs
Avi Kivity wrote:
> From: Jan Kiszka <jan.kiszka@siemens.com>
>
> Introduces the KVM_NMI IOCTL to the generic x86 part of KVM for
> injecting NMIs from user space and also extends the statistic report
> accordingly.
>
> Based on the original patch by Sheng Yang.
>
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> Signed-off-by: Sheng Yang <sheng.yang@intel.com>
> Signed-off-by: Avi Kivity <avi@redhat.com>
> ---
> arch/x86/include/asm/kvm_host.h | 2 +
> arch/x86/kvm/x86.c | 46 +++++++++++++++++++++++++++++++++++++-
> include/linux/kvm.h | 11 +++++++-
> 3 files changed, 55 insertions(+), 4 deletions(-)
>

...

> diff --git a/include/linux/kvm.h b/include/linux/kvm.h
> index f18b86f..44fd7fa 100644
> --- a/include/linux/kvm.h
> +++ b/include/linux/kvm.h
> @@ -83,18 +83,22 @@ struct kvm_irqchip {
> #define KVM_EXIT_S390_SIEIC 13
> #define KVM_EXIT_S390_RESET 14
> #define KVM_EXIT_DCR 15
> +#define KVM_EXIT_NMI 16
> +#define KVM_EXIT_NMI_WINDOW_OPEN 17
>
> /* for KVM_RUN, returned by mmap(vcpu_fd, offset=0) */
> struct kvm_run {
> /* in */
> __u8 request_interrupt_window;
> - __u8 padding1[7];
> + __u8 request_nmi_window;
> + __u8 padding1[6];
>
> /* out */
> __u32 exit_reason;
> __u8 ready_for_interrupt_injection;
> __u8 if_flag;
> - __u8 padding2[2];
> + __u8 ready_for_nmi_injection;
> + __u8 padding2;
>
> /* in (pre_kvm_run), out (post_kvm_run) */
> __u64 cr8;

Avi, please consider [1] again. You've already merged the related user
space cleanup, and I was just waiting for your comment on how to deal
with the kernel part, ideally _before_ merging the superfluous
ready_for/request NMI interface into mainline.

Thanks,
Jan

[1] http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/25016

--
Siemens AG, Corporate Technology, CT SE 26
Corporate Competence Center Embedded Linux


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