From: Ian Campbell <Ian.Campbell@citrix.com>
To: Julien Grall <julien.grall@linaro.org>
Cc: xen-devel@lists.xen.org, Tim Deegan <tim@xen.org>,
stefano.stabellini@eu.citrix.com
Subject: Re: [PATCH 4/9] xen: arm: turn vtimer traps for cp32/64 and sysreg into #undef
Date: Thu, 15 Jan 2015 12:35:26 +0000 [thread overview]
Message-ID: <1421325326.19103.349.camel@citrix.com> (raw)
In-Reply-To: <54B7B23D.8050809@linaro.org>
On Thu, 2015-01-15 at 12:27 +0000, Julien Grall wrote:
> Hi Ian,
>
> On 15/01/15 10:26, Ian Campbell wrote:
> > I'm looking into the vtimer masking and ctxt switching the irq state
> > now, once I've got that going exposing the ptimer directly to guests
> > ought to be pretty simple.
>
> I don't think we can expose directly the physical timer to the guest.
>
> If the guest tries to read CNTPCT_EL0, it will read the number of ticks
> since the host is up.
Yes, and they should expect that I think, that's the point of the
distinction between v and p timer. Of course maybe by providing it with
an offset until now maybe we've painted ourselves into a corner, which
sucks :-/
Ian.
next prev parent reply other threads:[~2015-01-15 12:35 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-09 16:22 [RFC PATCH 0/9] xen: arm: reenable support for 32-bit userspace running in 64-bit guest Ian Campbell
2014-09-09 16:23 ` [PATCH 1/9] xen: arm: Correct PMXEV cp register definitions Ian Campbell
2014-09-09 23:04 ` Julien Grall
2014-09-09 16:23 ` [PATCH 2/9] xen: arm: Factor out psr_mode_is_user Ian Campbell
2014-09-09 23:08 ` Julien Grall
2014-09-09 16:23 ` [PATCH 3/9] xen: arm: Handle 32-bit EL0 on 64-bit EL1 when advancing PC after trap Ian Campbell
2014-09-09 23:12 ` Julien Grall
2014-09-09 16:23 ` [PATCH 4/9] xen: arm: turn vtimer traps for cp32/64 and sysreg into #undef Ian Campbell
2014-09-09 23:31 ` Julien Grall
2014-09-10 9:46 ` Ian Campbell
2014-09-10 18:54 ` Julien Grall
2014-09-11 8:43 ` Ian Campbell
2015-01-14 16:33 ` Ian Campbell
2015-01-14 16:57 ` Julien Grall
2015-01-15 10:26 ` Ian Campbell
2015-01-15 12:27 ` Julien Grall
2015-01-15 12:35 ` Ian Campbell [this message]
2014-09-09 16:23 ` [PATCH 5/9] xen: arm: Handle CP15 register traps from userspace Ian Campbell
2014-09-09 23:42 ` Julien Grall
2014-09-10 9:48 ` Ian Campbell
2014-09-10 18:56 ` Julien Grall
2014-09-18 1:31 ` Ian Campbell
2014-09-09 16:23 ` [PATCH 6/9] xen: arm: Handle CP14 32-bit register accesses " Ian Campbell
2014-09-09 23:45 ` Julien Grall
2014-09-10 9:48 ` Ian Campbell
2015-02-10 3:40 ` Ian Campbell
2015-02-10 4:14 ` Julien Grall
2014-09-09 16:23 ` [PATCH 7/9] xen: arm: correctly handle sysreg " Ian Campbell
2014-09-09 16:23 ` [PATCH 8/9] xen: arm: handle remaining traps " Ian Campbell
2014-09-09 16:23 ` [PATCH 9/9] xen: arm: Allow traps from 32 bit userspace on 64 bit hypervisors again Ian Campbell
2014-09-09 16:23 ` [RFC PATCH 0/9] xen: arm: reenable support for 32-bit userspace running in 64-bit guest Ian Campbell
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