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Re: [Xen-devel] [PATCH v1] 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: Tue, 16 Oct 2018 11:25:30 +0100
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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: Tue, 16 Oct 2018 10:26:06 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 15/10/18 15:52, Alexandru Stefan ISAILA wrote:
> This patch adds a couple of regs to the vm_event that are used by
> the introspection. The base, limit and ar
> bits are compressed into a uint64_t union so as not to enlarge the
> vm_event.
>
> Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>
> ---
> xen/arch/x86/vm_event.c | 35 ++++++++++++++++++++++++++++++++---
> xen/include/public/vm_event.h | 29 +++++++++++++++++++++++++----
> 2 files changed, 57 insertions(+), 7 deletions(-)
>
> diff --git a/xen/arch/x86/vm_event.c b/xen/arch/x86/vm_event.c
> index 15de43c3e6..288da0087f 100644
> --- a/xen/arch/x86/vm_event.c
> +++ b/xen/arch/x86/vm_event.c
> @@ -171,13 +171,42 @@ void vm_event_fill_regs(vm_event_request_t *req)
> req->data.regs.x86.msr_lstar = ctxt.msr_lstar;
>
> hvm_get_segment_register(curr, x86_seg_fs, &seg);
> - req->data.regs.x86.fs_base = seg.base;
> + req->data.regs.x86.fs.fields.base = seg.base;
> + req->data.regs.x86.fs.fields.limit = seg.limit;
> + req->data.regs.x86.fs.fields.ar = seg.attr;
> + req->data.regs.x86.fs_sel = seg.sel;
This isn't correct for the limit. The packing logic needs to look
something like:
if ( seg.attr.g )
req->data.regs.x86.fs.fields.limit = seg.limit >> 12;
else
req->data.regs.x86.fs.fields.limit = seg.limit;
Otherwise you truncate the result in the default case.
Furthermore, I'd recommend creating a helper function for packing.
~Andrew
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