[{"id":3685514,"web_url":"http://patchwork.ozlabs.org/comment/3685514/","msgid":"","list_archive_url":null,"date":"2026-05-04T06:49:08","subject":"Re: [PATCH] hvf: arm: override HV_SYS_REG_MDCR_EL2","submitter":{"id":85046,"url":"http://patchwork.ozlabs.org/api/people/85046/","name":"Philippe Mathieu-Daudé","email":"philmd@linaro.org"},"content":"On 2/5/26 01:13, Mohamed Mediouni wrote:\n> In older SDKs, MDCR_EL2 was defined incorrectly.\n> \n> As such, override it with a #define if compiling with an older macOS\n> SDK.\n> \n> This is a workaround because the macOS CI setup we currently rely on\n> has not been kept up to date, to be able to land nested virtualization\n> support.\n> \n> Once CI is updated, the SME stubs can be removed and this\n> commit can be reverted.\n> \n> Signed-off-by: Mohamed Mediouni \n> ---\n> target/arm/hvf/hvf.c | 9 +++++++++\n> 1 file changed, 9 insertions(+)\n> \n> diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c\n> index 4f0f7ffba1..79209bc8e9 100644\n> --- a/target/arm/hvf/hvf.c\n> +++ b/target/arm/hvf/hvf.c\n> @@ -468,6 +468,15 @@ static const struct hvf_reg_match hvf_sme2_preg_match[] = {\n> #define HVF_TO_KVMID(HVF) \\\n> (CP_REG_ARM64 | CP_REG_SIZE_U64 | CP_REG_ARM64_SYSREG | (HVF))\n> \n> +/*\n> + * In older SDKs, MDCR_EL2 was defined incorrectly.\n> + * As such, override it with a #define if compiling with an older macOS SDK.\n> + * https://lore.kernel.org/qemu-devel/BCCED674-EAEF-4755-9BE1-116FB36FB5C9@apple.com/\n> + */\n> +#if !defined(MAC_OS_VERSION_26_0)\n\nNot sure about this check, i.e. wouldn't it clash with 26.1 release?\nI'd expect a check such:\n\n #if MAC_OS_X_VERSION_MAX_ALLOWED < 260000\n\n> +#define HV_SYS_REG_MDCR_EL2 0xe089\n> +#endif\n> +\n> /*\n> * Verify this at compile-time.\n> *","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=P8Tq5pvq;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::329;\n envelope-from=philmd@linaro.org; helo=mail-wm1-x329.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3685517,"web_url":"http://patchwork.ozlabs.org/comment/3685517/","msgid":"","list_archive_url":null,"date":"2026-05-04T06:59:15","subject":"Re: [PATCH] hvf: arm: override HV_SYS_REG_MDCR_EL2","submitter":{"id":91318,"url":"http://patchwork.ozlabs.org/api/people/91318/","name":"Mohamed Mediouni","email":"mohamed@unpredictable.fr"},"content":"> On 4. May 2026, at 08:49, Philippe Mathieu-Daudé wrote:\n> \n> On 2/5/26 01:13, Mohamed Mediouni wrote:\n>> In older SDKs, MDCR_EL2 was defined incorrectly.\n>> As such, override it with a #define if compiling with an older macOS\n>> SDK.\n>> This is a workaround because the macOS CI setup we currently rely on\n>> has not been kept up to date, to be able to land nested virtualization\n>> support.\n>> Once CI is updated, the SME stubs can be removed and this\n>> commit can be reverted.\n>> Signed-off-by: Mohamed Mediouni \n>> ---\n>> target/arm/hvf/hvf.c | 9 +++++++++\n>> 1 file changed, 9 insertions(+)\n>> diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c\n>> index 4f0f7ffba1..79209bc8e9 100644\n>> --- a/target/arm/hvf/hvf.c\n>> +++ b/target/arm/hvf/hvf.c\n>> @@ -468,6 +468,15 @@ static const struct hvf_reg_match hvf_sme2_preg_match[] = {\n>> #define HVF_TO_KVMID(HVF) \\\n>> (CP_REG_ARM64 | CP_REG_SIZE_U64 | CP_REG_ARM64_SYSREG | (HVF))\n>> +/*\n>> + * In older SDKs, MDCR_EL2 was defined incorrectly.\n>> + * As such, override it with a #define if compiling with an older macOS SDK.\n>> + * https://lore.kernel.org/qemu-devel/BCCED674-EAEF-4755-9BE1-116FB36FB5C9@apple.com/\n>> + */\n>> +#if !defined(MAC_OS_VERSION_26_0)\n> \n> Not sure about this check, i.e. wouldn't it clash with 26.1 release?\n> I'd expect a check such:\n> \n> #if MAC_OS_X_VERSION_MAX_ALLOWED < 260000\n\nHi,\n\nMAC_OS_VERSION_26_0 will be defined in all future SDKs.\n\nSee AvailabilityVersions.h in the macOS SDK, has all of them since 10.0\n> \n>> +#define HV_SYS_REG_MDCR_EL2 0xe089\n>> +#endif\n>> +\n>> /*\n>> * Verify this at compile-time.\n>> *\n> \n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=unpredictable.fr header.i=@unpredictable.fr\n header.a=rsa-sha256 header.s=sig1 header.b=dNbwqt5y;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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May 2026, at 08:49, Philippe Mathieu-Daudé wrote:\n>>\n>> On 2/5/26 01:13, Mohamed Mediouni wrote:\n>>> In older SDKs, MDCR_EL2 was defined incorrectly.\n>>> As such, override it with a #define if compiling with an older macOS\n>>> SDK.\n>>> This is a workaround because the macOS CI setup we currently rely on\n>>> has not been kept up to date, to be able to land nested virtualization\n>>> support.\n>>> Once CI is updated, the SME stubs can be removed and this\n>>> commit can be reverted.\n>>> Signed-off-by: Mohamed Mediouni \n>>> ---\n>>> target/arm/hvf/hvf.c | 9 +++++++++\n>>> 1 file changed, 9 insertions(+)\n>>> diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c\n>>> index 4f0f7ffba1..79209bc8e9 100644\n>>> --- a/target/arm/hvf/hvf.c\n>>> +++ b/target/arm/hvf/hvf.c\n>>> @@ -468,6 +468,15 @@ static const struct hvf_reg_match hvf_sme2_preg_match[] = {\n>>> #define HVF_TO_KVMID(HVF) \\\n>>> (CP_REG_ARM64 | CP_REG_SIZE_U64 | CP_REG_ARM64_SYSREG | (HVF))\n>>> +/*\n>>> + * In older SDKs, MDCR_EL2 was defined incorrectly.\n>>> + * As such, override it with a #define if compiling with an older macOS SDK.\n>>> + * https://lore.kernel.org/qemu-devel/BCCED674-EAEF-4755-9BE1-116FB36FB5C9@apple.com/\n>>> + */\n>>> +#if !defined(MAC_OS_VERSION_26_0)\n>>\n>> Not sure about this check, i.e. wouldn't it clash with 26.1 release?\n>> I'd expect a check such:\n>>\n>> #if MAC_OS_X_VERSION_MAX_ALLOWED < 260000\n> \n> Hi,\n> \n> MAC_OS_VERSION_26_0 will be defined in all future SDKs.\n> \n> See AvailabilityVersions.h in the macOS SDK, has all of them since 10.0\n\nRight.\n\nReviewed-by: Philippe Mathieu-Daudé \n\n>>\n>>> +#define HV_SYS_REG_MDCR_EL2 0xe089\n>>> +#endif\n>>> +\n>>> /*\n>>> * Verify this at compile-time.\n>>> *\n>>\n>>\n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=XO3PIn4W;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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