[{"id":3677048,"web_url":"http://patchwork.ozlabs.org/comment/3677048/","msgid":"","list_archive_url":null,"date":"2026-04-14T07:31:48","subject":"Re: [PATCH] hw: q35: fix VGA text console with SMM disabled","submitter":{"id":183,"url":"http://patchwork.ozlabs.org/api/people/183/","name":"Michael Tokarev","email":"mjt@tls.msk.ru"},"content":"On 13.04.2026 20:04, Mohamed Mediouni wrote:\n> Work around black screen in VGA mode with SMM disabled.\n> \n> Required by NVMM, HVF and WHPX backends.\n> \n> https://gnats.NetBSD.org/59721\n> https://gitlab.com/qemu-project/qemu/-/issues/2608\n> https://gitlab.com/qemu-project/qemu/-/work_items/3085\n> \n> Patch written by Taylor R Campbell \n> \n> Signed-off-by: Mohamed Mediouni \n\nSince this is effectively a reworked-for-later-qemu my patch from\nhttps://lore.kernel.org/qemu-devel/3458e5b7-b53e-4057-baea-03a729452255@tls.msk.ru/,\n\nSigned-off-by: Michael Tokarev \nCc: qemu-stable@nongnu.org\n\nThanks,\n\n/mjt\n\n> ---\n> hw/pci-host/q35.c | 22 +++++++++++++---------\n> 1 file changed, 13 insertions(+), 9 deletions(-)\n> \n> diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c\n> index e85e4227b3..05ef5222f7 100644\n> --- a/hw/pci-host/q35.c\n> +++ b/hw/pci-host/q35.c\n> @@ -372,6 +372,10 @@ static void mch_update_smram(MCHPCIState *mch)\n> memory_region_set_enabled(&mch->high_smram, false);\n> }\n> \n> + if (!mch->has_smm_ranges) {\n> + goto out;\n> + }\n> +\n> if ((pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_T_EN) &&\n> (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_G_SMRAME)) {\n> switch (pd->config[MCH_HOST_BRIDGE_ESMRAMC] &\n> @@ -405,7 +409,7 @@ static void mch_update_smram(MCHPCIState *mch)\n> mch->below_4g_mem_size - tseg_size);\n> memory_region_set_alias_offset(&mch->tseg_window,\n> mch->below_4g_mem_size - tseg_size);\n> -\n> +out:\n> memory_region_transaction_commit();\n> }\n> \n> @@ -474,15 +478,15 @@ static void mch_write_config(PCIDevice *d,\n> mch_update_pciexbar(mch);\n> }\n> \n> - if (!mch->has_smm_ranges) {\n> - return;\n> - }\n> -\n> if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,\n> MCH_HOST_BRIDGE_SMRAM_SIZE)) {\n> mch_update_smram(mch);\n> }\n> \n> + if (!mch->has_smm_ranges) {\n> + return;\n> + }\n> +\n> if (ranges_overlap(address, len, MCH_HOST_BRIDGE_EXT_TSEG_MBYTES,\n> MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_SIZE)) {\n> mch_update_ext_tseg_mbytes(mch);\n> @@ -585,10 +589,6 @@ static void mch_realize(PCIDevice *d, Error **errp)\n> PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE);\n> }\n> \n> - if (!mch->has_smm_ranges) {\n> - return;\n> - }\n> -\n> /* if *disabled* show SMRAM to all CPUs */\n> memory_region_init_alias(&mch->smram_region, OBJECT(mch), \"smram-region\",\n> mch->pci_address_space, MCH_HOST_BRIDGE_SMRAM_C_BASE,\n> @@ -604,6 +604,10 @@ static void mch_realize(PCIDevice *d, Error **errp)\n> &mch->open_high_smram, 1);\n> memory_region_set_enabled(&mch->open_high_smram, false);\n> \n> + if (!mch->has_smm_ranges) {\n> + return;\n> + }\n> +\n> /* smram, as seen by SMM CPUs */\n> memory_region_init(&mch->smram, OBJECT(mch), \"smram\", 4 * GiB);\n> memory_region_set_enabled(&mch->smram, true);","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 secure) header.d=tls.msk.ru header.i=@tls.msk.ru header.a=rsa-sha256\n header.s=202602 header.b=RxqMcI16;\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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Tsirkin\" ","References":"<20260413170407.57574-1-mohamed@unpredictable.fr>","Content-Language":"en-US, ru-RU","From":"Michael Tokarev ","Autocrypt":"addr=mjt@tls.msk.ru; keydata=\n xsFNBGYpLkcBEACsajkUXU2lngbm6RyZuCljo19q/XjZTMikctzMoJnBGVSmFV66kylUghxs\n HDQQF2YZJbnhSVt/mP6+V7gG6MKR5gYXYxLmypgu2lJdqelrtGf1XtMrobG6kuKFiD8OqV6l\n 2M5iyOZT3ydIFOUX0WB/B9Lz9WcQ6zYO9Ohm92tiWWORCqhAnwZy4ua/nMZW3RgO7bM6GZKt\n /SFIorK9rVqzv40D6KNnSyeWfqf4WN3EvEOozMfWrXbEqA7kvd6ShjJoe1FzCEQ71Fj9dQHL\n DZG+44QXvN650DqEtQ4RW9ozFk3Du9u8lbrXC5cqaCIO4dx4E3zxIddqf6xFfu4Oa5cotCM6\n /4dgxDoF9udvmC36qYta+zuDsnAXrYSrut5RBb0moez/AR8HD/cs/dS360CLMrl67dpmA+XD\n 7KKF+6g0RH46CD4cbj9c2egfoBOc+N5XYyr+6ejzeZNf40yjMZ9SFLrcWp4yQ7cpLsSz08lk\n a0RBKTpNWJdblviPQaLW5gair3tyJR+J1ER1UWRmKErm+Uq0VgLDBDQoFd9eqfJjCwuWZECp\n z2JUO+zBuGoKDzrDIZH2ErdcPx3oSlVC2VYOk6H4cH1CWr9Ri8i91ClivRAyVTbs67ha295B\n y4XnxIVaZU+jJzNgLvrXrkI1fTg4FJSQfN4W5BLCxT4sq8BDtwARAQABzSBNaWNoYWVsIFRv\n 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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":3677091,"web_url":"http://patchwork.ozlabs.org/comment/3677091/","msgid":"","list_archive_url":null,"date":"2026-04-14T09:26:10","subject":"Re: [PATCH-for-11.0] hw: q35: fix VGA text console with SMM disabled","submitter":{"id":85046,"url":"http://patchwork.ozlabs.org/api/people/85046/","name":"Philippe Mathieu-Daudé","email":"philmd@linaro.org"},"content":"On 14/4/26 09:31, Michael Tokarev wrote:\n> On 13.04.2026 20:04, Mohamed Mediouni wrote:\n>> Work around black screen in VGA mode with SMM disabled.\n>>\n>> Required by NVMM, HVF and WHPX backends.\n>>\n>> https://gnats.NetBSD.org/59721\n>> https://gitlab.com/qemu-project/qemu/-/issues/2608\n>> https://gitlab.com/qemu-project/qemu/-/work_items/3085\n>>\n>> Patch written by Taylor R Campbell \n>>\n>> Signed-off-by: Mohamed Mediouni \n> \n> Since this is effectively a reworked-for-later-qemu my patch from\n> https://lore.kernel.org/qemu-devel/3458e5b7-b53e-4057- \n> baea-03a729452255@tls.msk.ru/,\n> \n> Signed-off-by: Michael Tokarev \n> Cc: qemu-stable@nongnu.org\n\nReviewed-by: Philippe Mathieu-Daudé \n\n> \n> Thanks,\n> \n> /mjt\n> \n>> ---\n>>   hw/pci-host/q35.c | 22 +++++++++++++---------\n>>   1 file changed, 13 insertions(+), 9 deletions(-)\n>>\n>> diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c\n>> index e85e4227b3..05ef5222f7 100644\n>> --- a/hw/pci-host/q35.c\n>> +++ b/hw/pci-host/q35.c\n>> @@ -372,6 +372,10 @@ static void mch_update_smram(MCHPCIState *mch)\n>>           memory_region_set_enabled(&mch->high_smram, false);\n>>       }\n>> +    if (!mch->has_smm_ranges) {\n>> +        goto out;\n>> +    }\n>> +\n>>       if ((pd->config[MCH_HOST_BRIDGE_ESMRAMC] & \n>> MCH_HOST_BRIDGE_ESMRAMC_T_EN) &&\n>>           (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_G_SMRAME)) {\n>>           switch (pd->config[MCH_HOST_BRIDGE_ESMRAMC] &\n>> @@ -405,7 +409,7 @@ static void mch_update_smram(MCHPCIState *mch)\n>>                                 mch->below_4g_mem_size - tseg_size);\n>>       memory_region_set_alias_offset(&mch->tseg_window,\n>>                                      mch->below_4g_mem_size - tseg_size);\n>> -\n>> +out:\n>>       memory_region_transaction_commit();\n>>   }\n>> @@ -474,15 +478,15 @@ static void mch_write_config(PCIDevice *d,\n>>           mch_update_pciexbar(mch);\n>>       }\n>> -    if (!mch->has_smm_ranges) {\n>> -        return;\n>> -    }\n>> -\n>>       if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,\n>>                          MCH_HOST_BRIDGE_SMRAM_SIZE)) {\n>>           mch_update_smram(mch);\n>>       }\n>> +    if (!mch->has_smm_ranges) {\n>> +        return;\n>> +    }\n>> +\n>>       if (ranges_overlap(address, len, MCH_HOST_BRIDGE_EXT_TSEG_MBYTES,\n>>                          MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_SIZE)) {\n>>           mch_update_ext_tseg_mbytes(mch);\n>> @@ -585,10 +589,6 @@ static void mch_realize(PCIDevice *d, Error **errp)\n>>                    PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE);\n>>       }\n>> -    if (!mch->has_smm_ranges) {\n>> -        return;\n>> -    }\n>> -\n>>       /* if *disabled* show SMRAM to all CPUs */\n>>       memory_region_init_alias(&mch->smram_region, OBJECT(mch), \n>> \"smram-region\",\n>>                                mch->pci_address_space, \n>> MCH_HOST_BRIDGE_SMRAM_C_BASE,\n>> @@ -604,6 +604,10 @@ static void mch_realize(PCIDevice *d, Error **errp)\n>>                                           &mch->open_high_smram, 1);\n>>       memory_region_set_enabled(&mch->open_high_smram, false);\n>> +    if (!mch->has_smm_ranges) {\n>> +        return;\n>> +    }\n>> +\n>>       /* smram, as seen by SMM CPUs */\n>>       memory_region_init(&mch->smram, OBJECT(mch), \"smram\", 4 * GiB);\n>>       memory_region_set_enabled(&mch->smram, true);\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=kVDznVT1;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby 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