From: Cornelia Huck <cohuck@redhat.com>
To: David Hildenbrand <david@redhat.com>
Cc: Thomas Huth <thuth@redhat.com>,
Janosch Frank <frankja@linux.ibm.com>,
qemu-devel@nongnu.org, Ilya Leoshkevich <iii@linux.ibm.com>,
Halil Pasic <pasic@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
qemu-s390x@nongnu.org, Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH-for-4.2 v1 1/9] s390x/mmu: Better ASC selection in s390_cpu_get_phys_page_debug()
Date: Thu, 8 Aug 2019 14:57:13 +0200 [thread overview]
Message-ID: <20190808145713.6622ac61.cohuck@redhat.com> (raw)
In-Reply-To: <20190805152947.28536-2-david@redhat.com>
On Mon, 5 Aug 2019 17:29:39 +0200
David Hildenbrand <david@redhat.com> wrote:
> Let's select the ASC before calling the function and use MMU_DATA_LOAD.
> This is a preparation to:
> - Remove the ASC magic depending on the access mode from mmu_translate
> - Implement IEP support, where we could run into access exceptions
'IEP' was instruction execution protection?
> trying to fetch instructions
>
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
> target/s390x/helper.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/target/s390x/helper.c b/target/s390x/helper.c
> index 13ae9909ad..08166558a0 100644
> --- a/target/s390x/helper.c
> +++ b/target/s390x/helper.c
> @@ -58,7 +58,15 @@ hwaddr s390_cpu_get_phys_page_debug(CPUState *cs, vaddr vaddr)
> vaddr &= 0x7fffffff;
> }
>
> - if (mmu_translate(env, vaddr, MMU_INST_FETCH, asc, &raddr, &prot, false)) {
> + /*
> + * We want to read the code, however, not run into access exceptions
> + * (especially, IEP).
> + */
> + if (asc != PSW_ASC_HOME) {
> + asc = PSW_ASC_PRIMARY;
> + }
Previously, if we'd go in here specifying access register mode, we'd
hw_error() out. Now, that would be rewritten to using primary. Could
that be a problem, or do we filter out access register mode even
earlier?
(As an aside, I'm not sure the guest crashing qemu by specifying access
register mode was a good idea. Or do we get to slap the guest before
that happens?)
> +
> + if (mmu_translate(env, vaddr, MMU_DATA_LOAD, asc, &raddr, &prot, false)) {
> return -1;
> }
> return raddr;
next prev parent reply other threads:[~2019-08-08 12:57 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-05 15:29 [Qemu-devel] [PATCH-for-4.2 v1 0/9] s390x: MMU changes and extensions David Hildenbrand
2019-08-05 15:29 ` [Qemu-devel] [PATCH-for-4.2 v1 1/9] s390x/mmu: Better ASC selection in s390_cpu_get_phys_page_debug() David Hildenbrand
2019-08-08 12:57 ` Cornelia Huck [this message]
2019-08-08 13:02 ` David Hildenbrand
2019-08-12 7:12 ` Thomas Huth
2019-08-12 7:52 ` David Hildenbrand
2019-08-12 13:40 ` Cornelia Huck
2019-08-12 13:45 ` David Hildenbrand
2019-08-12 13:58 ` Cornelia Huck
2019-08-12 14:14 ` David Hildenbrand
2019-08-05 15:29 ` [Qemu-devel] [PATCH-for-4.2 v1 2/9] s390x/tcg: Rework MMU selection for instruction fetches David Hildenbrand
2019-08-05 15:29 ` [Qemu-devel] [PATCH-for-4.2 v1 3/9] s390x/mmu: DAT translation rewrite David Hildenbrand
2019-08-12 7:20 ` Thomas Huth
2019-08-12 7:43 ` David Hildenbrand
2019-08-12 8:04 ` David Hildenbrand
2019-08-19 11:40 ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2019-08-19 11:58 ` David Hildenbrand
2019-08-19 12:00 ` Thomas Huth
2019-08-05 15:29 ` [Qemu-devel] [PATCH-for-4.2 v1 4/9] s390x/mmu: Add EDAT2 translation support David Hildenbrand
2019-08-19 12:01 ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2019-08-05 15:29 ` [Qemu-devel] [PATCH-for-4.2 v1 5/9] s390x/mmu: Implement access-exception-fetch/store-indication facility David Hildenbrand
2019-08-19 12:16 ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2019-08-19 12:22 ` Thomas Huth
2019-08-19 12:26 ` David Hildenbrand
2019-08-19 12:30 ` Thomas Huth
2019-08-19 12:35 ` David Hildenbrand
2019-08-05 15:29 ` [Qemu-devel] [PATCH-for-4.2 v1 6/9] s390x/mmu: Implement enhanced suppression-on-protection facility 2 David Hildenbrand
2019-08-19 14:58 ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2019-08-05 15:29 ` [Qemu-devel] [PATCH-for-4.2 v1 7/9] s390x/mmu: Implement Instruction-Execution-Protection Facility David Hildenbrand
2019-08-19 15:03 ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2019-08-05 15:29 ` [Qemu-devel] [PATCH-for-4.2 v1 8/9] s390x/cpumodel: Prepare for changes of QEMU model David Hildenbrand
2019-08-13 16:02 ` Cornelia Huck
2019-08-19 15:07 ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2019-08-05 15:29 ` [Qemu-devel] [PATCH-for-4.2 v1 9/9] s390x/cpumodel: Add new TCG features to QEMU cpu model David Hildenbrand
2019-08-13 16:07 ` Cornelia Huck
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