From: Richard Henderson <richard.henderson@linaro.org>
To: Roman Bolshakov <r.bolshakov@yadro.com>
Cc: qemu-devel@nongnu.org, j@getutm.app
Subject: Re: [PATCH v3 for-6.0 1/2] tcg: Do not set guard pages on the rx portion of code_gen_buffer
Date: Mon, 22 Mar 2021 09:13:40 -0600 [thread overview]
Message-ID: <da13f32f-97d3-df87-286d-d12b1eff8520@linaro.org> (raw)
In-Reply-To: <YFiiBAwESsbf2lOZ@SPB-NB-133.local>
On 3/22/21 7:56 AM, Roman Bolshakov wrote:
> - What does mean that rx might be covered by huge pages? (perhaps I'm
> missing some context)
Huge pages are where a single level (n-1) page table entry covers the entire
span that would be covered by m * level n page table entries.
On x86, this is a 2MB hugepage, vs 512 4kB pages. Most modern cpus support
something similar.
See qemu_madvise(..., QEMU_MADV_HUGEPAGE).
r~
next prev parent reply other threads:[~2021-03-22 15:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-20 16:57 [PATCH v3 for-6.0 0/2] tcg: Workaround macOS 11.2 mprotect bug Richard Henderson
2021-03-20 16:57 ` [PATCH v3 for-6.0 1/2] tcg: Do not set guard pages on the rx portion of code_gen_buffer Richard Henderson
2021-03-22 13:56 ` Roman Bolshakov
2021-03-22 15:13 ` Richard Henderson [this message]
2021-03-20 16:57 ` [PATCH v3 for-6.0 2/2] tcg: Workaround macOS 11.2 mprotect bug Richard Henderson
2021-03-22 10:03 ` Philippe Mathieu-Daudé
2021-03-22 13:47 ` Roman Bolshakov
2021-03-22 15:00 ` Richard Henderson
2021-03-22 15:39 ` Philippe Mathieu-Daudé
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