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([94.75.70.14]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-53dd8cb7f00sm2023267e87.7.2024.11.27.04.50.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Nov 2024 04:50:20 -0800 (PST) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 29814a79-acbe-11ef-a0cd-8be0dac302b0 X-Custom-Connection: eyJyZW1vdGVpcCI6IjJhMDA6MTQ1MDo0ODY0OjIwOjoxMzIiLCJoZWxvIjoibWFpbC1sZjEteDEzMi5nb29nbGUuY29tIn0= X-Custom-Transaction: eyJpZCI6IjI5ODE0YTc5LWFjYmUtMTFlZi1hMGNkLThiZTBkYWMzMDJiMCIsInRzIjoxNzMyNzExODIxLjI1MzU2MSwic2VuZGVyIjoib2xla3NpaS5rdXJvY2hrb0BnbWFpbC5jb20iLCJyZWNpcGllbnQiOiJ4ZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5vcmcifQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1732711820; x=1733316620; darn=lists.xenproject.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=pVDvF5YqyyLTl9nNm34usBBdPtMjgbaktt06G1afM/M=; b=O0gB0lBrGt0J8QHqUWjGh3sVSPMkrjWK/pLj29G0drKlFsqu6/xZfqr9bC4maPlfzk IP7yRMDsmOVfmMA0iQo4SWThIMd5RqYaF3XijJFUxHOIIS2W8kg1w9rMWFqK5eL2wIc6 49XG03wuoFkILmmlU2GBmeEvmB0ZW58IK2UhtRjRKFT0O7G0E11gIBCTJrLUq0L1PAzJ GMRJq3DQgeCe6oMoiucsiSHixny7q1bZLa8JjdLWVjpeEVs3fUX9Oknd0QsgO3mFWYEY hirB8fgQwXjDnVOuEOQvrPZD7GZBFrl7v09YrgVJl0yaMuFc3j9nzMAhkxQ7gF1ajsAy IkQQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732711820; x=1733316620; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=pVDvF5YqyyLTl9nNm34usBBdPtMjgbaktt06G1afM/M=; b=AwZ+oKuNOQQ1+zsSEGvj27wMC2iFpj+TMCA907cdnZAXCcZG5v2PZQE80GRDrAsC+C XkSWewpChJYibSfSLPM992h5o08QBHEtlWwNhkY434eyfqeE7vVAKb4nR2iQPsRPVf7u vRTJcMD0LLUJ+FZL7rVbjcGBJ1jVpoA23NrAHre6MJ3p94Rq4P+35vgYLp2ZY764IwPo QcUDtAfXtqL6Dypbv4A2/CksnpoL+CXD2tmjgdBHKcPWSc08WryLlSBsOttD3ROSQ1Bm WTy3g3zh8jQ1xUe2RQTTr09br9807OXwPmq9kXykIlKpJqwgw8R5gUfi+DDn6chxjSlz K2aQ== X-Gm-Message-State: AOJu0YyPMLf/9uszE9pgn1/98KKIUWJt2RX4Wn32I8JJIRY2mqK3WxMh hiiwCU3CIrRsWNYfk7aF2HgPQq9BAfms4RXElHaIjbA+wIR0laF3CyfGEA== X-Gm-Gg: ASbGncvUBRdOkVF4pb1upN8h1DpNQ3yqOtwDNw8ngTHOpJBZptVAnsOSd2A/Oh+14rt KMIjtcFdSfPfzDRj4anrpXgXziRuA0dIzoqpNgmjQr2vzntEBnTUdPwCoLmY/+bssgOJxB7tl84 32SaiQBq8/UADJMQq++lp/pS+ilNnFVai7aCXOD0UDJ3LTWXF8/P9PA6YBNBQg8qeRTWIzdBnPl K/7AW2cwnXlkmrBDjXua0PMRl9EQU+VNczvz76tW58QM3f4u94= X-Google-Smtp-Source: AGHT+IHrzpuEseSFO9gOn9yNkiZ71guV/3ErvZjDGwhl4x02Ued71294I6HeJfRHYSKswtxj+xcFyg== X-Received: by 2002:a05:6512:b1e:b0:53d:ecf6:aadc with SMTP id 2adb3069b0e04-53df0104754mr1896350e87.43.1732711820255; Wed, 27 Nov 2024 04:50:20 -0800 (PST) From: Oleksii Kurochko To: xen-devel@lists.xenproject.org Cc: Oleksii Kurochko , Alistair Francis , Bob Eshleman , Connor Davis , Andrew Cooper , Jan Beulich , Julien Grall , Stefano Stabellini Subject: [PATCH v1 3/6] xen/riscv: add {set,clear}_fixmap() functions for managing fixmap entries Date: Wed, 27 Nov 2024 13:50:12 +0100 Message-ID: <2badea2de39b7614d38a620d1b718478de1fc82c.1732709650.git.oleksii.kurochko@gmail.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1732711844588019100 Content-Type: text/plain; charset="utf-8" Introduce set_fixmap() and clear_fixmap() functions to manage mappings in the fixmap region. The set_fixmap() function maps a 4k page ( as only L0 is expected to be updated; look at setup_fixmap_mappings() ) at a specified fixmap entry using map_pages_to_xen(), while clear_fixmap() removes the mapping from a fixmap entry by calling destroy_xen_mappings(). Both functions ensure that the operations succeed by asserting that their respective calls (map_pages_to_xen() and destroy_xen_mappings()) return 0. A `BUG_ON` check is used to trigger a failure if any issues occur during the mapping or unmapping process. Signed-off-by: Oleksii Kurochko Acked-by: Jan Beulich --- xen/arch/riscv/include/asm/fixmap.h | 5 +++++ xen/arch/riscv/pt.c | 19 +++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/xen/arch/riscv/include/asm/fixmap.h b/xen/arch/riscv/include/a= sm/fixmap.h index 818c8ce07b..e399a15f53 100644 --- a/xen/arch/riscv/include/asm/fixmap.h +++ b/xen/arch/riscv/include/asm/fixmap.h @@ -32,6 +32,11 @@ */ extern pte_t xen_fixmap[]; =20 +/* Map a page in a fixmap entry */ +void set_fixmap(unsigned int map, mfn_t mfn, unsigned int flags); +/* Remove a mapping from a fixmap entry */ +void clear_fixmap(unsigned int map); + #define fix_to_virt(slot) ((void *)FIXMAP_ADDR(slot)) =20 static inline unsigned int virt_to_fix(vaddr_t vaddr) diff --git a/xen/arch/riscv/pt.c b/xen/arch/riscv/pt.c index 8d35ef5ca8..ed9a943d4c 100644 --- a/xen/arch/riscv/pt.c +++ b/xen/arch/riscv/pt.c @@ -8,6 +8,7 @@ #include #include =20 +#include #include #include =20 @@ -433,3 +434,21 @@ int __init populate_pt_range(unsigned long virt, unsig= ned long nr_mfns) { return pt_update(virt, INVALID_MFN, nr_mfns, PTE_POPULATE); } + +/* Map a 4k page in a fixmap entry */ +void set_fixmap(unsigned int map, mfn_t mfn, unsigned int flags) +{ + int res; + + res =3D map_pages_to_xen(FIXMAP_ADDR(map), mfn, 1, flags | PTE_SMALL); + BUG_ON(res !=3D 0); +} + +/* Remove a mapping from a fixmap entry */ +void clear_fixmap(unsigned int map) +{ + int res; + + res =3D destroy_xen_mappings(FIXMAP_ADDR(map), FIXMAP_ADDR(map) + PAGE= _SIZE); + BUG_ON(res !=3D 0); +} --=20 2.47.0