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Re: [PATCH for-6.0 v2 4/5] hw/core/loader: Add new function rom_ptr_for_


From: Richard Henderson
Subject: Re: [PATCH for-6.0 v2 4/5] hw/core/loader: Add new function rom_ptr_for_as()
Date: Thu, 18 Mar 2021 15:56:16 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1

On 3/18/21 3:28 PM, Peter Maydell wrote:
On Thu, 18 Mar 2021 at 21:14, Richard Henderson
<richard.henderson@linaro.org> wrote:

On 3/18/21 1:02 PM, Peter Maydell wrote:
+     * Note that we do not check @as against the 'as' member in the
+     * 'struct Rom' returned by rom_ptr(). The Rom::as is the
+     * AddressSpace which the rom blob should be written to...
...
Should you really have this special case?  Nowhere is this going to verify that
@addr is in @as.

It's the "happens almost all the time" case. Nothing verifies
that @addr is in @as anyway -- see the "Note that" part of the
comment above.

The comment explains why we don't examine Rom::as.
But we do check @addr vs @as via @as -> @fv -> flatview_translate.

All we do is look for "every other address in the AS that
maps to the same MR as the address we started with".
Are you asking about the !cbdata.mr exit ?

Well, I suppose.  I guess I didn't read the cb properly.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~



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