From nobody Fri Oct 3 18:01:22 2025 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 2633512FF6F for ; Thu, 28 Aug 2025 00:02:05 +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=1756339327; cv=none; b=bpj4dw4CMk5ghKAARKnghSo4jbsgOc0JEe0gfLSgATSVx/GMqWh10m81edGI5oYDlQTSzxYtH4Q6AqeGJq2/5cu3UFdTWFbnhAcfkvxi45ba33trJ/OZImXFKIsdnr2E4vQJcaIZWT0GlNg7wOuy9X606UaEWQk2P4Qbr8nvf1U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756339327; c=relaxed/simple; bh=8tZ83PeYs29SmFwlLYawA90+tGBTxdUNJGqvgVUYI08=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=W1BVJ6GpM9r2sODxKthvJZ2Chn0tvSx3/ibOe+HlfY/P6oGZsBnteLVBGwf11HwiyedlftbOYQmcfx9IFjkpewBp6dlZTniCKm2J2kWe337oMhLd+h6MfozpX+McD1Vn3sw7JvnE99NuM9zgA286yDNi187f4048mpxB+qUyrQo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=yo+AOOCE; 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--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="yo+AOOCE" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-324e4c3af5fso368143a91.3 for ; Wed, 27 Aug 2025 17:02:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1756339325; x=1756944125; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=hDymskQNp6wG2uiiMHxVPzsL1nAJPxy4zRxFOrP95kA=; b=yo+AOOCEgQsPtXsvEZ3HLVcsX1TmXb2v7Tx+yKYWB17Taupoci1mHoBlWVe28a4bs2 AsY+GUQDG1/883XQ1o4nO+jPq0xLEyraGBiG40dNPFuzgziGLXNIkOfMQSyTcXohftCe h09d91Rq2CcH4LY16snMRZa12iL9z9kOD/D+IoXX/waF3iGnXfqulzx7IHl8igthuTyl Z8ZIwoN1Ub8S9PovdB9eTq6QHzlcYByPjvhk32rvT87HJBhNKqzv4lV7Zt28QP4B3bck P0JDPtsS5c+8H3vMjven3/YyoNrd2Sdnz9fXfParttV3jgLhuu7PhwMyVjFMwy8YYYSL YcqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756339325; x=1756944125; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=hDymskQNp6wG2uiiMHxVPzsL1nAJPxy4zRxFOrP95kA=; b=IqhyqEHz8V9MeP5tMK/eiToXL0ox8YzKvD9U/5GUsO1tTVfQ+zaJPfSs5kzAvdke9T ugfJoei7xco5klaSQokFeT1bDTpWpm4nYX3Hlk+UtEkL+q936qTn/CNdyv81iY/j25Xt Q0ZtFAUHbyeB92Ka+fCMAbT0q/V2wW+IQ6QjP/FfuOoEc+e8WhllOwoZsW955zQAm1OC mubFveNYYfrSH5gG1fbxYy7/BFR5eYOkU9zm1ZgcbLMWnJAkYAyF3JAgZ7kn/F4b4mGp qtZGZzNRp+mPZCCVzc18ORw8XUADNYNUxrgH2k/NkO7Z0bavTafN1MDBCIu0xpoajUEU F/Jw== X-Gm-Message-State: AOJu0YzIheEPH1Og3N1dklHb2qHHGu3W0CF1PLCvUUnuD4bUyIWF7XkG DMhmVAVJZ6vA8aBuCv2xYBpz5YaQWrcsFG+oelmksbQULCd2PR2/IS+gHrCDyp1z2k/Z4+xHrQh vPXQL4A== X-Google-Smtp-Source: AGHT+IEpldWCysonYjdHETjodWyZtDlIBYcwDxX/6JZFBAIAnGNdK+zSnqMrfXxPLk2m5pFyKQhTG4/yaKw= X-Received: from pjj15.prod.google.com ([2002:a17:90b:554f:b0:325:833b:6f27]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:55c4:b0:327:aaeb:e814 with SMTP id 98e67ed59e1d1-327aaebf1b1mr940666a91.23.1756339325323; Wed, 27 Aug 2025 17:02:05 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 27 Aug 2025 17:01:51 -0700 In-Reply-To: <20250828000156.23389-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250828000156.23389-1-seanjc@google.com> X-Mailer: git-send-email 2.51.0.268.g9569e192d0-goog Message-ID: <20250828000156.23389-3-seanjc@google.com> Subject: [PATCH v2 2/7] Drivers: hv: Disentangle VTL return cancellation from SIGPENDING From: Sean Christopherson To: Marc Zyngier , Oliver Upton , Catalin Marinas , Will Deacon , Tianrui Zhao , Bibo Mao , Huacai Chen , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Peter Zijlstra , Andy Lutomirski , "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, loongarch@lists.linux.dev, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-hyperv@vger.kernel.org, rcu@vger.kernel.org, Nuno Das Neves , Mukesh R Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Check for return to a lower VTL being cancelled separately from handling pending TIF-based work, as there is no need to immediately process pending work; the kernel will immediately exit to userspace (ignoring preemption) and handle the pending work at that time. Disentangling cancellation from the TIF-based work will allow switching to common virtualization APIs for detecting and processing pending work. Signed-off-by: Sean Christopherson --- drivers/hv/mshv_vtl_main.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/hv/mshv_vtl_main.c b/drivers/hv/mshv_vtl_main.c index 12f5e77b7095..aa09a76f0eff 100644 --- a/drivers/hv/mshv_vtl_main.c +++ b/drivers/hv/mshv_vtl_main.c @@ -731,19 +731,21 @@ static int mshv_vtl_ioctl_return_to_lower_vtl(void) _TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL | _TIF_NEED_RESCHED_LAZY; unsigned long ti_work; - u32 cancel; unsigned long irq_flags; struct hv_vp_assist_page *hvp; int ret; =20 local_irq_save(irq_flags); + if (READ_ONCE(mshv_vtl_this_run()->cancel)) { + local_irq_restore(irq_flags); + preempt_enable(); + return -EINTR; + } + ti_work =3D READ_ONCE(current_thread_info()->flags); - cancel =3D READ_ONCE(mshv_vtl_this_run()->cancel); - if (unlikely((ti_work & VTL0_WORK) || cancel)) { + if (unlikely(ti_work & VTL0_WORK)) { local_irq_restore(irq_flags); preempt_enable(); - if (cancel) - ti_work |=3D _TIF_SIGPENDING; ret =3D mshv_do_pre_guest_mode_work(ti_work); if (ret) return ret; --=20 2.51.0.268.g9569e192d0-goog