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[130.117.225.111]) by mx.google.com with ESMTPS id ffacd0b85a97d-48c7247b878si1078707f8f.206.2026.10.06.13.44.37 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Oct 2026 13:44:37 -0700 (PDT) Received-SPF: pass (google.com: domain of khorenko@virtuozzo.com designates 130.117.225.111 as permitted sender) client-ip=130.117.225.111; Authentication-Results: mx.google.com; dkim=pass header.i=@virtuozzo.com header.s=relay header.b=rMlsiqlM; spf=pass (google.com: domain of khorenko@virtuozzo.com designates 130.117.225.111 as permitted sender) smtp.mailfrom=khorenko@virtuozzo.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=virtuozzo.com DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=Message-Id:Content-Type:MIME-Version:Subject:Date :From; bh=4/G+69KwyrOESPjYDDHRqtLykNTv0mGDfi/NMitsOW8=; b=rMlsiqlMQaXKglPzmIV F1VIYmbNUQD0onxfdbh7jqSO8hqY0zlYQWvTPs7bCGeVlLASHl09ggHRQTEQz8qhceGuCVWOAd8cB WGU3ZjUiaH1haCIR25pQn1UsXFsPDAFZ3tsHNkjy28SxNdVfAMLaLV74uPFSsgAuFAcAYcTlix9fh Rop9K3YAoR+/xhQ3cqqG/4rruV3nRJAUl1B6VaMb+bvBqvx9UlRs2KLc+GycfsSoVKPTjqQ0QcxpQ WAOumxR1VgZBmVlR23vNt5Hb5ryV+smK1R5lke328Ko2GOhgz+YKaQEnauPZt3NY2S0XWGrVlRIxv 3euA4eFKHDRgivA==; Received: from ch-demo-asa.virtuozzo.com ([130.117.225.8] helo=f0.sw.ru) by relay.virtuozzo.com with esmtp (Exim 4.96) (envelope-from ) id 1xEByO-002tkg-0G; Tue, 06 Oct 2026 22:44:27 +0200 From: Konstantin Khorenko Date: Tue, 06 Oct 2026 22:44:33 +0200 MIME-Version: 1.0 Message-Id: <20261006-b4-prep-khorenko-vstor-148656-cpuid-v3-2-16141b8ca07d@virtuozzo.com> References: <20261006-b4-prep-khorenko-vstor-148656-cpuid-v3-0-16141b8ca07d@virtuozzo.com> In-Reply-To: <20261006-b4-prep-khorenko-vstor-148656-cpuid-v3-0-16141b8ca07d@virtuozzo.com> To: Pavel Tikhomirov , Vasileios Almpanis X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2528; i=khorenko@virtuozzo.com; h=from:subject:message-id; bh=KpAeQeg//S4LBWOdMeFvbbhdn8lXgcPxQfDcnbT2Fb4=; b=owEBbQKS/ZANAwAKAVGWCkf5YVwqAcsmYgBqxV2zbQAmkaQYjk8x6Yw3OXUzzLsPUT4UEASlh zaJrIL9r7aJAjMEAAEKAB0WIQRWD23IPcXT0GO9CCxRlgpH+WFcKgUCasVdswAKCRBRlgpH+WFc KvZHD/9DTHohihEBS1f3CHCTGq7BNOW2G057bE/9+9KjhgdYPpiGNUYF4twNOLxfL/Ml32B4AYH 3jKKKofBGWKDMasN1UlZCqTgtsMSnP1faoRFuXDFsYpDXr3Rwt4vFP4MQAXa7buW7mKbxTOK3nx eJJEuWnEXKOXfq7mWKH2QEP/dx5vKjnIBetOGSXG/xQOvLr/1HKAeYqYRSASdfTWSJ6UGctimGW KP8tnh+Y9tChRy54tZnaErXJF1ejOGnLjExv+ama5E+QKQ3AVy+bWVqJxngzajmqbj0sPNfYhKI nslYP80Hh990dfXrRNPoEZewxhl3oOLIOTX1nrEQ/+Trhj9C6IZ+QLO+ZwdpOagnICtDNHUIRFH atjbSKsbb4CN1P5MyHCJXefnXnDU58HZbOYGhtay9XHpAeHsY1PaVuyigven6L6XgDjBMktip4Y eTg8NpJ8jXikCSY/GfYbDI529fc6xD1dien+0sca59LIQKXM4rQ5wCXwBMCwOx/+MX24h0AHrcn lFa3LJlS0+ViauPQYeWNqKUGHNMVbOqyjAsoU6WWTvYGXvNvC0CuKVXWF1ieHtim3cs2ZY6GHsQ YdrqtSbP+L/ll4Z61p7NVXkBZkTqSLemvtPeKsVU0e0mPscaXgcuV2QWJ9r6tg5Eo795jXlCHht AIXRhJILjc8oU2w== X-Developer-Key: i=khorenko@virtuozzo.com; a=openpgp; fpr=560F6DC83DC5D3D063BD082C51960A47F9615C2A X-OZ-Fwd: true Cc: devel@openvz.org Subject: [Devel] [PATCH hci-8.1 v3 2/5] x86/ve: enable CPUID faulting at once when the current task enters a VE X-BeenThere: devel@openvz.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: OpenVZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: devel-bounces@openvz.org Errors-To: devel-bounces@openvz.org ve_setup_task() only sets TIF_CPUID_OVERRIDE. The MSR follows the flag in __switch_to_xtra(), so a task that enters a VE through unshare() or setns() keeps executing CPUID natively until it is scheduled out for the first time and sees the host values instead of the override table. Add set_cpuid_override(), which sets the flag and, like disable_cpuid(), flips the CPU state synchronously when the task is the current one. Tasks set up through clone() are not running yet and are still handled at their first switch-in. https://virtuozzo.atlassian.net/browse/VSTOR-148843 Feature: x86: cpu pools (cpuid override) Signed-off-by: Konstantin Khorenko --- arch/x86/kernel/process.c | 12 ++++++++++++ include/linux/cpuid_override.h | 3 +++ kernel/ve/ve.c | 2 +- 3 files changed, 16 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 28fc4168b6c9f..2673f2e51a833 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -381,6 +382,17 @@ static void enable_cpuid(void) preempt_enable(); } +#ifdef CONFIG_VE +void set_cpuid_override(struct task_struct *tsk) +{ + preempt_disable(); + if (!test_and_set_tsk_thread_flag(tsk, TIF_CPUID_OVERRIDE) && + tsk == current) + set_cpuid_faulting(true); + preempt_enable(); +} +#endif + static int get_cpuid_mode(void) { return !test_thread_flag(TIF_NOCPUID); diff --git a/include/linux/cpuid_override.h b/include/linux/cpuid_override.h index 1f5223728c9ba..83a955b628cdf 100644 --- a/include/linux/cpuid_override.h +++ b/include/linux/cpuid_override.h @@ -35,4 +35,7 @@ static inline bool cpuid_override_on(void) { return rcu_access_pointer(cpuid_override); } + +struct task_struct; +void set_cpuid_override(struct task_struct *tsk); #endif diff --git a/kernel/ve/ve.c b/kernel/ve/ve.c index 579628a8a310a..8df881039c3c6 100644 --- a/kernel/ve/ve.c +++ b/kernel/ve/ve.c @@ -1857,7 +1857,7 @@ void ve_setup_task(struct task_struct *task, struct ve_struct *ve) #ifdef CONFIG_X86 if (cpuid_override_on()) - set_tsk_thread_flag(task, TIF_CPUID_OVERRIDE); + set_cpuid_override(task); #endif } EXPORT_SYMBOL(ve_setup_task); -- 2.43.0 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel