From: Tamas K Lengyel <tamas.lengyel@zentific.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
Julien Grall <julien.grall@arm.com>,
Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: [PATCH v8 4/6] arm/vm_event: get/set registers
Date: Wed, 6 Jul 2016 13:23:34 -0600 [thread overview]
Message-ID: <CAErYnsh4ZXXZBFuyk49407j63Okh9BrxX_fWNet8bDeQrPbciw@mail.gmail.com> (raw)
In-Reply-To: <577CD2B202000078000FB85D@prv-mh.provo.novell.com>
On Wed, Jul 6, 2016 at 1:43 AM, Jan Beulich <JBeulich@suse.com> wrote:
>>>> On 05.07.16 at 20:37, <tamas.lengyel@zentific.com> wrote:
>> +struct vm_event_regs_arm64 {
>> + uint64_t x0;
>> + uint64_t x1;
>> + uint64_t x2;
>> + uint64_t x3;
>> + uint64_t x4;
>> + uint64_t x5;
>> + uint64_t x6;
>> + uint64_t x7;
>> + uint64_t x8;
>> + uint64_t x9;
>> + uint64_t x10;
>> + uint64_t x11;
>> + uint64_t x12;
>> + uint64_t x13;
>> + uint64_t x14;
>> + uint64_t x15;
>> + uint64_t x16;
>> + uint64_t x17;
>> + uint64_t x18;
>> + uint64_t x19;
>> + uint64_t x20;
>> + uint64_t x21;
>> + uint64_t x22;
>> + uint64_t x23;
>> + uint64_t x24;
>> + uint64_t x25;
>> + uint64_t x26;
>> + uint64_t x27;
>> + uint64_t x28;
>> + uint64_t x29;
>> + uint64_t x30;
>> + uint64_t pc;
>> +};
>
> Isn't the stack pointer a fully separate register in aarch64? Not
> making available something as essential as that seems wrong to
> me.
>
The register is available for access already, so unless there is an
actual use-case that requires it to be transmitted through vm_event I
don't see the point for transmitting it. So as I mentioned in my other
response, I'm inclined to reduce this patch to the bare essentials my
use-case requires at this point and leave the extensions up for the
future when - and if - it will be of use. Since this patch is just an
optimization, if transmitting such reduced set is not acceptable for
some reason, I'll forgo this patch entirely.
Thanks,
Tamas
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next prev parent reply other threads:[~2016-07-06 19:23 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-05 18:37 [PATCH v8 1/6] monitor: rename and relocate vm_event_monitor_traps Tamas K Lengyel
2016-07-05 18:37 ` [PATCH v8 2/6] arm: filter SMC exceptions with failed condition checks Tamas K Lengyel
2016-07-06 17:31 ` Julien Grall
2016-07-06 18:52 ` Tamas K Lengyel
2016-07-05 18:37 ` [PATCH v8 3/6] monitor: ARM SMC events Tamas K Lengyel
2016-07-05 18:37 ` [PATCH v8 4/6] arm/vm_event: get/set registers Tamas K Lengyel
2016-07-06 7:43 ` Jan Beulich
2016-07-06 7:59 ` Razvan Cojocaru
2016-07-06 17:39 ` Julien Grall
2016-07-06 19:23 ` Tamas K Lengyel [this message]
2016-07-06 21:12 ` Julien Grall
2016-07-06 22:01 ` Tamas K Lengyel
2016-07-06 18:04 ` Julien Grall
2016-07-06 19:12 ` Tamas K Lengyel
2016-07-07 8:23 ` Jan Beulich
2016-07-07 9:46 ` Julien Grall
2016-07-07 9:57 ` Jan Beulich
2016-07-07 10:09 ` Julien Grall
2016-07-07 15:53 ` Tamas K Lengyel
2016-07-05 18:37 ` [PATCH v8 5/6] tools/libxc: add xc_monitor_privileged_call Tamas K Lengyel
2016-07-05 18:37 ` [PATCH v8 6/6] tools/xen-access: add test-case for ARM SMC Tamas K Lengyel
2016-07-07 10:05 ` Julien Grall
2016-07-07 15:54 ` Tamas K Lengyel
2016-07-05 19:15 ` [PATCH v8 1/6] monitor: rename and relocate vm_event_monitor_traps Razvan Cojocaru
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