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From: Richard Henderson <richard.henderson@linaro.org>
To: David Hildenbrand <david@redhat.com>, qemu-devel@nongnu.org
Cc: Thomas Huth <thuth@redhat.com>, Cornelia Huck <cohuck@redhat.com>,
	Eduardo Habkost <ehabkost@redhat.com>,
	Aleksandar Rikalo <arikalo@wavecomp.com>,
	Riku Voipio <riku.voipio@iki.fi>,
	qemu-s390x@nongnu.org,
	Aleksandar Markovic <amarkovic@wavecomp.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Aurelien Jarno <aurelien@aurel32.net>,
	Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH v1 4/9] tcg: Enforce single page access in probe_write() for !CONFIG_USER_ONLY
Date: Fri, 23 Aug 2019 08:29:38 -0700
Message-ID: <47c65454-f624-1b84-6810-7ac77ae9ce5f@linaro.org> (raw)
In-Reply-To: <ae881524-d745-c8e1-5765-157962d2b157@linaro.org>

On 8/23/19 8:28 AM, Richard Henderson wrote:
> On 8/23/19 3:07 AM, David Hildenbrand wrote:
>> While the CONFIG_USER_ONLY variant can handle multiple pages (no MMU), the
>> !CONFIG_USER_ONLY variant can't and won't. We'll want to convert
>> probe_write() to return a host address (similar to tlb_vaddr_to_host())
>> soon. This only works on page granularity.
>>
>> Signed-off-by: David Hildenbrand <david@redhat.com>
>> ---
>>  accel/tcg/cputlb.c | 2 ++
>>  1 file changed, 2 insertions(+)
> 
> As I just mentioned in the previous, I think the two implementations should match.
> 
> Anyway, the "multiple pages" thing above still means exactly two, since if
> there were three pages involved we were only probing two of them, and the third
> could still be unmapped.

Oh, but the actual code here, is fine.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~



  reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-23 10:07 [Qemu-devel] [PATCH v1 0/9] tcg: probe_write() refactorings and watchpoints David Hildenbrand
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 1/9] s390x/tcg: Use guest_addr_valid() instead of h2g_valid() in probe_write_access() David Hildenbrand
2019-08-23 14:49   ` Richard Henderson
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 2/9] s390x/tcg: Fix length calculation " David Hildenbrand
2019-08-23 14:50   ` Richard Henderson
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 3/9] tcg: Factor out CONFIG_USER_ONLY probe_write() from s390x code David Hildenbrand
2019-08-23 15:17   ` Richard Henderson
2019-08-23 15:22   ` Richard Henderson
2019-08-23 15:49     ` David Hildenbrand
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 4/9] tcg: Enforce single page access in probe_write() for !CONFIG_USER_ONLY David Hildenbrand
2019-08-23 15:28   ` Richard Henderson
2019-08-23 15:29     ` Richard Henderson [this message]
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 5/9] mips/tcg: Call probe_write() for CONFIG_USER_ONLY as well David Hildenbrand
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 6/9] hppa/tcg: Call probe_write() also for CONFIG_USER_ONLY David Hildenbrand
2019-08-23 15:31   ` Richard Henderson
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 7/9] s390x/tcg: Pass a size to probe_write() in do_csst() David Hildenbrand
2019-08-23 15:32   ` Richard Henderson
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 8/9] exec.c: Factor out core logic of check_watchpoint() David Hildenbrand
2019-08-23 11:27   ` David Hildenbrand
2019-08-23 16:09     ` Richard Henderson
2019-08-23 18:25       ` David Hildenbrand
2019-08-24 15:27     ` Richard Henderson
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 9/9] tcg: Check for watchpoints in probe_write() David Hildenbrand
2019-08-23 16:15   ` Richard Henderson
2019-08-24 19:45   ` Richard Henderson

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