From: Paul Mackerras <paulus@samba.org>
To: Alexander Graf <agraf@suse.de>
Cc: kvm-ppc@vger.kernel.org, kvm@vger.kernel.org, anton@samba.org
Subject: Re: [PATCH 5/6] KVM: PPC: Book3S HV: Access XICS in BE
Date: Tue, 17 Jun 2014 11:02:04 +1000 [thread overview]
Message-ID: <20140617010204.GB16554@iris.ozlabs.ibm.com> (raw)
In-Reply-To: <1402482831-8941-6-git-send-email-agraf@suse.de>
On Wed, Jun 11, 2014 at 12:33:50PM +0200, Alexander Graf wrote:
> On the exit path from the guest we check what type of interrupt we received
> if we received one. This means we're doing hardware access to the XICS interrupt
> controller.
>
> However, when running on a little endian system, this access is byte reversed.
>
> So let's make sure to swizzle the bytes back again and virtuall make XICS
> accesses big endian.
...
> @@ -2241,7 +2253,8 @@ kvmppc_read_intr:
> 42: /* It's not an IPI and it's for the host, stash it in the PACA
> * before exit, it will be picked up by the host ICP driver
> */
> - stw r0, HSTATE_SAVED_XIRR(r13)
> + li r4, HSTATE_SAVED_XIRR
> + STWX_BE r0, r13, r4
This is a paca field, not something mandated by PAPR or shared with
the guest, so why do we need to keep it BE? If you do make it BE,
don't you also need to fix kvmppc_get_xics_latch()?
Paul.
next prev parent reply other threads:[~2014-06-17 1:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-11 10:33 [PATCH 0/6] KVM: PPC: Book3S HV: Enable on little endian hosts Alexander Graf
2014-06-11 10:33 ` [PATCH 1/6] PPC: Add asm helpers for BE 32bit load/store Alexander Graf
2014-06-17 0:51 ` Paul Mackerras
2014-06-17 8:34 ` Alexander Graf
2014-06-11 10:33 ` [PATCH 2/6] KVM: PPC: Book3S HV: Make HTAB code LE host aware Alexander Graf
2014-06-11 10:33 ` [PATCH 3/6] KVM: PPC: Book3S HV: Access guest VPA in BE Alexander Graf
2014-06-11 10:33 ` [PATCH 4/6] KVM: PPC: Book3S HV: Access host lppaca and shadow slb " Alexander Graf
2014-06-11 10:33 ` [PATCH 5/6] KVM: PPC: Book3S HV: Access XICS " Alexander Graf
2014-06-17 1:02 ` Paul Mackerras [this message]
2014-06-17 8:37 ` Alexander Graf
2014-06-17 10:22 ` Alexander Graf
2014-06-17 12:13 ` Paul Mackerras
2014-06-17 12:14 ` Alexander Graf
2014-06-11 10:33 ` [PATCH 6/6] KVM: PPC: Book3S HV: Enable for little endian hosts Alexander Graf
2014-06-16 4:22 ` [PATCH 0/6] KVM: PPC: Book3S HV: Enable on " Aneesh Kumar K.V
2014-06-16 12:17 ` Alexander Graf
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