From nobody Sun Apr 5 18:17:38 2026 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4FA0A27E1DC for ; Sat, 28 Feb 2026 03:33:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772249615; cv=none; b=mKBTMODBHO30KloResOGz1spMnsj6V4/mdiVZwGeSBzKdwyTz4VKWaq3C4oSeRsv3cBMRAziccCyLHEqsH+VaqkAb9lZNbO1b2u4nK7gNyaxMLgvsH/QQp7bSrNfaywO43Jpd9VXlHfBmWzL5iuHwtX6OPgltsCy3E7XtRIZ0QY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772249615; c=relaxed/simple; bh=QeMp4SItLEY+RtGFw9jYs1xeLiZhCoFEz023scLX/I0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=ffeVYAzHr0nla1qQvAjR4IG9SrkOqLmJYPIzC6Nzl6IR6ANXVBBfwu6gkmVcZmeuBHkM5DM9HI6IRMt5HlwVCWHEAnHVgrNtyasljDkHbRCT8RmOmkbgTdCZS8/tS+lv73/PWD+RgM9LsFcnqo8QbqDKYUKfAnssL3oQlf/6ubo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--chengkev.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=l28WjmCR; arc=none smtp.client-ip=209.85.216.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--chengkev.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="l28WjmCR" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-3593c55e434so2541911a91.1 for ; Fri, 27 Feb 2026 19:33:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1772249614; x=1772854414; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=GMeckVBCJeT9+5nk88sC0zbSpPJ6gkZiJXCizVZfHao=; b=l28WjmCRRpREE2KrbLLK7wy/j7KLff0QU7tGltj9VjCcO5vhBC6JlelyFzMkRMpJMW /JT9zVqmsovVIO2MbWcHVCkOr/ICwIQ9gXRRKWIDs3GAXsMRAoPwso89dVJUPFwPn7bB 5NvmahBGntsXrzcL+tzyUa1bO259CPoRWUJ4z4ZT56UMbS+En4Pyi8lbyprnFhjiuhnD Q6aopBlqpAWw82znBxIgf6p00wiw02F2HdMrkm8mzwsLcJD9VcFntDr9KhZ+mV4978Q/ VThAPQ3QcFQvRpqV4a5UhHSGre08Mavg+ipKRs5Q7Sxa+iCG3PQw6+CQAR0cbeqlyaB/ mXPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772249614; x=1772854414; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=GMeckVBCJeT9+5nk88sC0zbSpPJ6gkZiJXCizVZfHao=; b=eAqs0cKJ1IsJE58S0sUgtpRyU3rpExUpb9IEWiukNvuYDyPT/xMn5zPVl4BsTMXZnj F/TxTVOoEE9Xpi2l83WPlE6ovih/61ClHkoQEBNm97SwE98KkemPkCxvZWyABG8BaL7N QGBExqiLHyJml7Bm5QUy2ahp14eHAWzCPIhZ9xAxajLfB9IdcSfkK2EL6+4xEzg6+C7i DACsXimXHkJw9FRLCCQ1PPpivTdtO58wngPg7oilVwfRFu/jHo7T933SwxdxZmuFK/9i H5B8tbc61CM96EGsrIxK9Lw5l+/8j/8bH+uM0XHEkV+sWgfDt7GEMyNxfuRPENbFYjOO 5S4A== X-Forwarded-Encrypted: i=1; AJvYcCUDOxd2svU2oxqEkEUT/EQBZIwvrdaknUMVuO+EjiXRxBXnHa5MrdnoYyQ6IEacffpWzT04dAZAoufxrcw=@vger.kernel.org X-Gm-Message-State: AOJu0YzE7NOdNN7EmPFC2hMRrfvJvqYQf7sxv8vWdaXvfl7RrC4sUIbB NNTlG3Al39RUAIsd2X6wYS7uUWeB972TXHny0FYLRzEC/3TIeb+e6oe96rLCfBcYaLKN/6hWIAC Rb38VyUbG8QfIuQ== X-Received: from pjbpi2.prod.google.com ([2002:a17:90b:1e42:b0:359:bc4:636]) (user=chengkev job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90a:da85:b0:358:ed1d:2834 with SMTP id 98e67ed59e1d1-35968faa663mr4320102a91.6.1772249613484; Fri, 27 Feb 2026 19:33:33 -0800 (PST) Date: Sat, 28 Feb 2026 03:33:25 +0000 In-Reply-To: <20260228033328.2285047-1-chengkev@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260228033328.2285047-1-chengkev@google.com> X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog Message-ID: <20260228033328.2285047-2-chengkev@google.com> Subject: [PATCH V4 1/4] KVM: SVM: Move STGI and CLGI intercept handling From: Kevin Cheng To: seanjc@google.com, pbonzini@redhat.com Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, yosry@kernel.org, Kevin Cheng Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add STGI/CLGI intercept handling to svm_recalc_instruction_intercepts() in preparation for making the function EFER-aware. A later patch will recalculate instruction intercepts when EFER.SVME is toggled, which is needed to inject #UD on STGI/CLGI when the guest clears EFER.SVME. When clearing the STGI intercept with vgif enabled, request KVM_REQ_EVENT if there is a pending GIF-controlled event. This avoids breaking NMI/SMI window tracking, as enable_{nmi,smi}_window() sets INTERCEPT_STGI to detect when NMIs become unblocked. KVM_REQ_EVENT forces kvm_check_and_inject_events() to re-evaluate pending events and re-enable the intercept if needed. Extract the pending GIF event check into a helper function svm_has_pending_gif_event() to deduplicate the logic between svm_recalc_instruction_intercepts() and svm_set_gif(). Signed-off-by: Kevin Cheng --- arch/x86/kvm/svm/svm.c | 27 +++++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 8f8bc863e2143..25b15934330bb 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -1009,6 +1009,14 @@ void svm_write_tsc_multiplier(struct kvm_vcpu *vcpu) preempt_enable(); } +static bool svm_has_pending_gif_event(struct vcpu_svm *svm) +{ + return svm->vcpu.arch.smi_pending || + svm->vcpu.arch.nmi_pending || + kvm_cpu_has_injectable_intr(&svm->vcpu) || + kvm_apic_has_pending_init_or_sipi(&svm->vcpu); +} + /* Evaluate instruction intercepts that depend on guest CPUID features. */ static void svm_recalc_instruction_intercepts(struct kvm_vcpu *vcpu) { @@ -1050,6 +1058,20 @@ static void svm_recalc_instruction_intercepts(struct= kvm_vcpu *vcpu) svm_clr_intercept(svm, INTERCEPT_VMLOAD); svm_clr_intercept(svm, INTERCEPT_VMSAVE); } + + if (vgif) { + /* + * If there is a pending interrupt controlled by GIF, set + * KVM_REQ_EVENT to re-evaluate if the intercept needs to be set + * again to track when GIF is re-enabled (e.g. for NMI + * injection). + */ + svm_clr_intercept(svm, INTERCEPT_STGI); + if (svm_has_pending_gif_event(svm)) + kvm_make_request(KVM_REQ_EVENT, &svm->vcpu); + + svm_clr_intercept(svm, INTERCEPT_CLGI); + } } if (kvm_need_rdpmc_intercept(vcpu)) @@ -2320,10 +2342,7 @@ void svm_set_gif(struct vcpu_svm *svm, bool value) svm_clear_vintr(svm); enable_gif(svm); - if (svm->vcpu.arch.smi_pending || - svm->vcpu.arch.nmi_pending || - kvm_cpu_has_injectable_intr(&svm->vcpu) || - kvm_apic_has_pending_init_or_sipi(&svm->vcpu)) + if (svm_has_pending_gif_event(svm)) kvm_make_request(KVM_REQ_EVENT, &svm->vcpu); } else { disable_gif(svm); -- 2.53.0.473.g4a7958ca14-goog