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Re: [Xen-devel] [PATCH v6] arch/x86: Add registers to vm_event
- To: Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 2 Nov 2018 11:47:41 +0000
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- Cc: "tamas@xxxxxxxxxxxxx" <tamas@xxxxxxxxxxxxx>, "wei.liu2@xxxxxxxxxx" <wei.liu2@xxxxxxxxxx>, "jbeulich@xxxxxxxx" <jbeulich@xxxxxxxx>, "rcojocaru@xxxxxxxxxxxxxxx" <rcojocaru@xxxxxxxxxxxxxxx>
- Delivery-date: Fri, 02 Nov 2018 11:47:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 30/10/18 15:49, Alexandru Stefan ISAILA wrote:
> diff --git a/xen/include/public/vm_event.h b/xen/include/public/vm_event.h
> index 36e3f4685d..d1111f3139 100644
> --- a/xen/include/public/vm_event.h
> +++ b/xen/include/public/vm_event.h
> @@ -29,7 +29,7 @@
>
> #include "xen.h"
>
> -#define VM_EVENT_INTERFACE_VERSION 0x00000003
> +#define VM_EVENT_INTERFACE_VERSION 0x00000004
>
> #if defined(__XEN__) || defined(__XEN_TOOLS__)
>
> @@ -157,6 +157,12 @@
> #define VM_EVENT_X86_CR4 2
> #define VM_EVENT_X86_XCR0 3
>
> +/* The limit field is right-shifted by 12 bits if .ar.g is set. */
> +struct vm_event_x86_selector_reg {
> + uint32_t limit : 20;
> + uint32_t ar : 12;
> +};
> +
> /*
> * Using custom vCPU structs (i.e. not hvm_hw_cpu) for both x86 and ARM
> * so as to not fill the vm_event ring buffer too quickly.
> @@ -191,9 +197,25 @@ struct vm_event_regs_x86 {
> uint64_t msr_efer;
> uint64_t msr_star;
> uint64_t msr_lstar;
> + uint32_t cs_base;
> + uint32_t ss_base;
> + uint32_t ds_base;
> + uint32_t es_base;
> uint64_t fs_base;
> uint64_t gs_base;
> - uint32_t cs_arbytes;
> + struct vm_event_x86_selector_reg cs;
> + struct vm_event_x86_selector_reg ss;
> + struct vm_event_x86_selector_reg ds;
> + struct vm_event_x86_selector_reg es;
> + struct vm_event_x86_selector_reg fs;
> + struct vm_event_x86_selector_reg gs;
> + uint64_t shadow_gs;
> + uint16_t cs_sel;
> + uint16_t ss_sel;
> + uint16_t ds_sel;
> + uint16_t es_sel;
> + uint16_t fs_sel;
> + uint16_t gs_sel;
> uint32_t _pad;
> };
>
Very sorry to do this at v6, but could I pester you to also add %dr6 to
the regsterset, seeing as you're changing the interface version? This
is going to be necessary for introspection agents to handle #DB
intercepts correctly.
~Andrew
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