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([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-224109e99dfsm79230515ad.91.2025.03.10.08.13.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Mar 2025 08:13:53 -0700 (PDT) From: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= To: Paul Walmsley , Palmer Dabbelt , Anup Patel , Atish Patra , Shuah Khan , Jonathan Corbet , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , Samuel Holland Subject: [PATCH v3 08/17] riscv: misaligned: add a function to check misalign trap delegability Date: Mon, 10 Mar 2025 16:12:15 +0100 Message-ID: <20250310151229.2365992-9-cleger@rivosinc.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250310151229.2365992-1-cleger@rivosinc.com> References: <20250310151229.2365992-1-cleger@rivosinc.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Checking for the delegability of the misaligned access trap is needed for the KVM FWFT extension implementation. Add a function to get the delegability of the misaligned trap exception. Signed-off-by: Clément Léger --- arch/riscv/include/asm/cpufeature.h | 5 +++++ arch/riscv/kernel/traps_misaligned.c | 17 +++++++++++++++-- 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/arch/riscv/include/asm/cpufeature.h b/arch/riscv/include/asm/cpufeature.h index ad7d26788e6a..8b97cba99fc3 100644 --- a/arch/riscv/include/asm/cpufeature.h +++ b/arch/riscv/include/asm/cpufeature.h @@ -69,12 +69,17 @@ int cpu_online_unaligned_access_init(unsigned int cpu); #if defined(CONFIG_RISCV_SCALAR_MISALIGNED) void unaligned_emulation_finish(void); bool unaligned_ctl_available(void); +bool misaligned_traps_can_delegate(void); DECLARE_PER_CPU(long, misaligned_access_speed); #else static inline bool unaligned_ctl_available(void) { return false; } +static inline bool misaligned_traps_can_delegate(void) +{ + return false; +} #endif bool check_vector_unaligned_access_emulated_all_cpus(void); diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c index db31966a834e..a67a6e709a06 100644 --- a/arch/riscv/kernel/traps_misaligned.c +++ b/arch/riscv/kernel/traps_misaligned.c @@ -716,10 +716,10 @@ static int cpu_online_check_unaligned_access_emulated(unsigned int cpu) } #endif -#ifdef CONFIG_RISCV_SBI - static bool misaligned_traps_delegated; +#ifdef CONFIG_RISCV_SBI + static int cpu_online_sbi_unaligned_setup(unsigned int cpu) { if (sbi_fwft_set(SBI_FWFT_MISALIGNED_EXC_DELEG, 1, 0) && @@ -761,6 +761,7 @@ static int cpu_online_sbi_unaligned_setup(unsigned int cpu __always_unused) { return 0; } + #endif int cpu_online_unaligned_access_init(unsigned int cpu) @@ -773,3 +774,15 @@ int cpu_online_unaligned_access_init(unsigned int cpu) return cpu_online_check_unaligned_access_emulated(cpu); } + +bool misaligned_traps_can_delegate(void) +{ + /* + * Either we successfully requested misaligned traps delegation for all + * CPUS or the SBI does not implemented FWFT extension but delegated the + * exception by default. + */ + return misaligned_traps_delegated || + all_cpus_unaligned_scalar_access_emulated(); +} +EXPORT_SYMBOL_GPL(misaligned_traps_can_delegate); \ No newline at end of file -- 2.47.2 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 36DECC28B2E for ; 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([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-224109e99dfsm79230515ad.91.2025.03.10.08.13.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Mar 2025 08:13:53 -0700 (PDT) From: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= To: Paul Walmsley , Palmer Dabbelt , Anup Patel , Atish Patra , Shuah Khan , Jonathan Corbet , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , Samuel Holland Subject: [PATCH v3 08/17] riscv: misaligned: add a function to check misalign trap delegability Date: Mon, 10 Mar 2025 16:12:15 +0100 Message-ID: <20250310151229.2365992-9-cleger@rivosinc.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250310151229.2365992-1-cleger@rivosinc.com> References: <20250310151229.2365992-1-cleger@rivosinc.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250310_081354_501908_EA1535D6 X-CRM114-Status: GOOD ( 12.08 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Q2hlY2tpbmcgZm9yIHRoZSBkZWxlZ2FiaWxpdHkgb2YgdGhlIG1pc2FsaWduZWQgYWNjZXNzIHRy YXAgaXMgbmVlZGVkCmZvciB0aGUgS1ZNIEZXRlQgZXh0ZW5zaW9uIGltcGxlbWVudGF0aW9uLiBB ZGQgYSBmdW5jdGlvbiB0byBnZXQgdGhlCmRlbGVnYWJpbGl0eSBvZiB0aGUgbWlzYWxpZ25lZCB0 cmFwIGV4Y2VwdGlvbi4KClNpZ25lZC1vZmYtYnk6IENsw6ltZW50IEzDqWdlciA8Y2xlZ2VyQHJp dm9zaW5jLmNvbT4KLS0tCiBhcmNoL3Jpc2N2L2luY2x1ZGUvYXNtL2NwdWZlYXR1cmUuaCAgfCAg NSArKysrKwogYXJjaC9yaXNjdi9rZXJuZWwvdHJhcHNfbWlzYWxpZ25lZC5jIHwgMTcgKysrKysr KysrKysrKysrLS0KIDIgZmlsZXMgY2hhbmdlZCwgMjAgaW5zZXJ0aW9ucygrKSwgMiBkZWxldGlv bnMoLSkKCmRpZmYgLS1naXQgYS9hcmNoL3Jpc2N2L2luY2x1ZGUvYXNtL2NwdWZlYXR1cmUuaCBi L2FyY2gvcmlzY3YvaW5jbHVkZS9hc20vY3B1ZmVhdHVyZS5oCmluZGV4IGFkN2QyNjc4OGU2YS4u OGI5N2NiYTk5ZmMzIDEwMDY0NAotLS0gYS9hcmNoL3Jpc2N2L2luY2x1ZGUvYXNtL2NwdWZlYXR1 cmUuaAorKysgYi9hcmNoL3Jpc2N2L2luY2x1ZGUvYXNtL2NwdWZlYXR1cmUuaApAQCAtNjksMTIg KzY5LDE3IEBAIGludCBjcHVfb25saW5lX3VuYWxpZ25lZF9hY2Nlc3NfaW5pdCh1bnNpZ25lZCBp bnQgY3B1KTsKICNpZiBkZWZpbmVkKENPTkZJR19SSVNDVl9TQ0FMQVJfTUlTQUxJR05FRCkKIHZv aWQgdW5hbGlnbmVkX2VtdWxhdGlvbl9maW5pc2godm9pZCk7CiBib29sIHVuYWxpZ25lZF9jdGxf YXZhaWxhYmxlKHZvaWQpOworYm9vbCBtaXNhbGlnbmVkX3RyYXBzX2Nhbl9kZWxlZ2F0ZSh2b2lk KTsKIERFQ0xBUkVfUEVSX0NQVShsb25nLCBtaXNhbGlnbmVkX2FjY2Vzc19zcGVlZCk7CiAjZWxz ZQogc3RhdGljIGlubGluZSBib29sIHVuYWxpZ25lZF9jdGxfYXZhaWxhYmxlKHZvaWQpCiB7CiAJ cmV0dXJuIGZhbHNlOwogfQorc3RhdGljIGlubGluZSBib29sIG1pc2FsaWduZWRfdHJhcHNfY2Fu X2RlbGVnYXRlKHZvaWQpCit7CisJcmV0dXJuIGZhbHNlOworfQogI2VuZGlmCiAKIGJvb2wgY2hl Y2tfdmVjdG9yX3VuYWxpZ25lZF9hY2Nlc3NfZW11bGF0ZWRfYWxsX2NwdXModm9pZCk7CmRpZmYg LS1naXQgYS9hcmNoL3Jpc2N2L2tlcm5lbC90cmFwc19taXNhbGlnbmVkLmMgYi9hcmNoL3Jpc2N2 L2tlcm5lbC90cmFwc19taXNhbGlnbmVkLmMKaW5kZXggZGIzMTk2NmE4MzRlLi5hNjdhNmU3MDlh MDYgMTAwNjQ0Ci0tLSBhL2FyY2gvcmlzY3Yva2VybmVsL3RyYXBzX21pc2FsaWduZWQuYworKysg Yi9hcmNoL3Jpc2N2L2tlcm5lbC90cmFwc19taXNhbGlnbmVkLmMKQEAgLTcxNiwxMCArNzE2LDEw IEBAIHN0YXRpYyBpbnQgY3B1X29ubGluZV9jaGVja191bmFsaWduZWRfYWNjZXNzX2VtdWxhdGVk KHVuc2lnbmVkIGludCBjcHUpCiB9CiAjZW5kaWYKIAotI2lmZGVmIENPTkZJR19SSVNDVl9TQkkK LQogc3RhdGljIGJvb2wgbWlzYWxpZ25lZF90cmFwc19kZWxlZ2F0ZWQ7CiAKKyNpZmRlZiBDT05G SUdfUklTQ1ZfU0JJCisKIHN0YXRpYyBpbnQgY3B1X29ubGluZV9zYmlfdW5hbGlnbmVkX3NldHVw KHVuc2lnbmVkIGludCBjcHUpCiB7CiAJaWYgKHNiaV9md2Z0X3NldChTQklfRldGVF9NSVNBTElH TkVEX0VYQ19ERUxFRywgMSwgMCkgJiYKQEAgLTc2MSw2ICs3NjEsNyBAQCBzdGF0aWMgaW50IGNw dV9vbmxpbmVfc2JpX3VuYWxpZ25lZF9zZXR1cCh1bnNpZ25lZCBpbnQgY3B1IF9fYWx3YXlzX3Vu dXNlZCkKIHsKIAlyZXR1cm4gMDsKIH0KKwogI2VuZGlmCiAKIGludCBjcHVfb25saW5lX3VuYWxp Z25lZF9hY2Nlc3NfaW5pdCh1bnNpZ25lZCBpbnQgY3B1KQpAQCAtNzczLDMgKzc3NCwxNSBAQCBp bnQgY3B1X29ubGluZV91bmFsaWduZWRfYWNjZXNzX2luaXQodW5zaWduZWQgaW50IGNwdSkKIAog CXJldHVybiBjcHVfb25saW5lX2NoZWNrX3VuYWxpZ25lZF9hY2Nlc3NfZW11bGF0ZWQoY3B1KTsK IH0KKworYm9vbCBtaXNhbGlnbmVkX3RyYXBzX2Nhbl9kZWxlZ2F0ZSh2b2lkKQoreworCS8qCisJ ICogRWl0aGVyIHdlIHN1Y2Nlc3NmdWxseSByZXF1ZXN0ZWQgbWlzYWxpZ25lZCB0cmFwcyBkZWxl Z2F0aW9uIGZvciBhbGwKKwkgKiBDUFVTIG9yIHRoZSBTQkkgZG9lcyBub3QgaW1wbGVtZW50ZWQg RldGVCBleHRlbnNpb24gYnV0IGRlbGVnYXRlZCB0aGUKKwkgKiBleGNlcHRpb24gYnkgZGVmYXVs dC4KKwkgKi8KKwlyZXR1cm4gbWlzYWxpZ25lZF90cmFwc19kZWxlZ2F0ZWQgfHwKKwkgICAgICAg YWxsX2NwdXNfdW5hbGlnbmVkX3NjYWxhcl9hY2Nlc3NfZW11bGF0ZWQoKTsKK30KK0VYUE9SVF9T WU1CT0xfR1BMKG1pc2FsaWduZWRfdHJhcHNfY2FuX2RlbGVnYXRlKTsKXCBObyBuZXdsaW5lIGF0 IGVuZCBvZiBmaWxlCi0tIAoyLjQ3LjIKCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fXwpsaW51eC1yaXNjdiBtYWlsaW5nIGxpc3QKbGludXgtcmlzY3ZAbGlz dHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3Rp bmZvL2xpbnV4LXJpc2N2Cg==