From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Julien Grall <julien.grall@citrix.com>, xen-devel@lists.xenproject.org
Cc: ian.campbell@citrix.com, stefano.stabellini@eu.citrix.com
Subject: Re: [RFC 00/10] xen/arm: Implement the hypercall handling in assembly
Date: Tue, 15 Dec 2015 18:33:27 +0000 [thread overview]
Message-ID: <56705CF7.8070309@citrix.com> (raw)
In-Reply-To: <1450201928-4928-1-git-send-email-julien.grall@citrix.com>
On 15/12/15 17:51, Julien Grall wrote:
> Hi all,
>
> This patch aims is a first attempt to write the hypercall dispatch in assembly
> in order to avoid reloading the hypercall arguments from the stack.
Why? A couple of stack operations are in the noise, performance wise.
I have half a patch series to do exactly the opposite for x86 PV guests,
as C is far more maintainable than asm.
~Andrew
next prev parent reply other threads:[~2015-12-15 18:33 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-15 17:51 [RFC 00/10] xen/arm: Implement the hypercall handling in assembly Julien Grall
2015-12-15 17:51 ` [RFC 01/10] xen/arm: move lr, push and pop in a separate header Julien Grall
2015-12-15 17:52 ` [RFC 02/10] xen/arm: Drop unused defines in asm/bug.h Julien Grall
2015-12-15 17:52 ` [RFC 03/10] xen/arm: Implement assembly version of WARN/BUG/ASSERT_FAILED Julien Grall
2015-12-15 17:52 ` [RFC 04/10] xen/arm64: Add an assembly macro for perf counter Julien Grall
2015-12-15 17:52 ` [RFC 05/10] xen/arm: gic_inject: Introduce a local variable to store current Julien Grall
2015-12-15 17:52 ` [RFC 06/10] xen/arm: gic: Allow the LRs to be cleared lazily Julien Grall
2015-12-15 17:52 ` [RFC 07/10] xen/arm: Implement the code to dispatch the hypercall in assembly Julien Grall
2015-12-15 17:52 ` [RFC 08/10] xen/arm64: Implement the hypercall handing fully " Julien Grall
2015-12-15 17:52 ` [RFC 09/10] xen/arm: Remove the C version of do_trap_hypercall Julien Grall
2015-12-15 17:52 ` [RFC 10/10] xen/arm: Factorize the C code to dispatch HVC Julien Grall
2015-12-15 18:33 ` Andrew Cooper [this message]
2015-12-16 11:19 ` [RFC 00/10] xen/arm: Implement the hypercall handling in assembly Ian Campbell
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