From nobody Wed Apr 8 04:44:48 2026 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (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 A41193CFF71 for ; Tue, 10 Mar 2026 23:48:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773186529; cv=none; b=OdOdbGMj7i8BxzM/E68enj4q1TMfwiRY/aQdLWSpRp6V7Tjd+IcfEFW1FdxYzeUxyn37CiNrV5ss/TEEmZCTQjSk6tgSLZGssHHvxa99yYShmvtXnZCfdhY7wP0rP9irEPKKG7s1V02DuUL6A6B5C8a3NAMwbTZdYiityqL1IZQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773186529; c=relaxed/simple; bh=np7yKuIzh2g5DJEKgMDoaxNWOTXyqLqKAdcesC7LCQY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=UB6ZHb7zaaQ1TBBySV87ObrJHWbf0tMNA1eGHf5l95T+QFB/nBJBO6HTtCyM0KCHOZRomKchqRQa0fFOqmYdMlBVuDx8YDdCWHCnkvW5zJl5KaGzrUH7yvEE9NVJSu+ApQzfSxjAtwsngFqWHAYBUtuYnOuKmShnH1fE9iO2nAM= 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=3eJA4Nxv; arc=none smtp.client-ip=209.85.215.202 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="3eJA4Nxv" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-c73939e0314so3006220a12.1 for ; Tue, 10 Mar 2026 16:48:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1773186526; x=1773791326; 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=FpG980lWE241naOxLLMlz2TI3FNz63t0Ji/1Q07E1+Y=; b=3eJA4NxvXDWHYwTFu6EIrKJRwPwBOVrg2vfZNRifLHiwDjHbAKwFvZxJtcDa/gF9P2 tVc+TeKI5xd0fAnb/F4qge9LIkP0IEkdQCJ6G/v75xwhh2sOIUn84ta3f4qVPiRSEu+s c88lPUTmFR9W3usCkV2zvNtwUMnODbYl/BKc885vLs2faNYB9aXXFeKM96x3mUtkx16w ghNgswh/Gef5SKdAnVZVtXTDXmUBFaD/kZAoCCtvThBduKsCR7tTvsXZ2Bg4EXdDf00F Usa0UFL3UzvNUfYc+EIjBmm9xpEigbxd83AFaVMmRARBpDz3asCAnkst/ocHAQdmc/c1 HMvA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1773186526; x=1773791326; 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=FpG980lWE241naOxLLMlz2TI3FNz63t0Ji/1Q07E1+Y=; b=ntEmphV1FPLykWZ2pmyuAksmaZIWWs9H/v+Q6wnNxdhEWAe5z6SoEv7BMB9tdny6vZ t0wLpNsFttcW4qXe0Vj8+lbtAHGtZyVhg1zaI7lJ1S4wCfF8jNPee6Wz388bqhN33hL+ qLCcLquluZf240LHkGyfwNq5PYb6u8mbePQC9SP4GDaeHeFFJT0Ug33AeTrE1XjM9CAP t/EnAtu/3kmn2kJK/Y3i2kgvWEYioUs0BkKYmxZc/8uFUBWDgfQG81ldsjOUJM5y7gIf BEicrMHIWUENoVXJ9HBIRzxWdw/qOt4yGFr2X+plzzEWA22emSG2OUyU/ipNDNlhugDa wQXA== X-Forwarded-Encrypted: i=1; AJvYcCXNqGbccycpLNPyyipLspv+p22QuLsMvKZU5IAhsVhX3M3r22QBdIH3c9X6zAhbQAOjpzLZx4++maL+VCg=@vger.kernel.org X-Gm-Message-State: AOJu0Yw7U5VTHW+4IY9aJwQPas3BlukWm1LK9LDP+RESJXI34PUNZ2NP g1SJ3BJT5/LLgzE8AHERWxI8U67U6STC/2Cx3BdHKtDSOmh19hN0dcQfeGq9vpcsPVAahmBtW+k 0GGn5Eg== X-Received: from pgc27.prod.google.com ([2002:a05:6a02:2f9b:b0:c65:e8e7:d481]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:9090:b0:394:6208:6623 with SMTP id adf61e73a8af0-398c5f3bf2emr387226637.27.1773186525978; Tue, 10 Mar 2026 16:48:45 -0700 (PDT) Reply-To: Sean Christopherson Date: Tue, 10 Mar 2026 16:48:14 -0700 In-Reply-To: <20260310234829.2608037-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260310234829.2608037-1-seanjc@google.com> X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog Message-ID: <20260310234829.2608037-7-seanjc@google.com> Subject: [PATCH 06/21] KVM: SEV: Lock all vCPUs for the duration of SEV-ES VMSA synchronization From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Jethro Beekman , Alexander Potapenko , "=?UTF-8?q?Carlos=20L=C3=B3pez?=" Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Lock and unlock all vCPUs in a single batch when synchronizing SEV-ES VMSAs during launch finish, partly to dedup the code by a tiny amount, but mostly so that sev_launch_update_vmsa() uses the same logic/flow as all other SEV ioctls that lock all vCPUs. Signed-off-by: Sean Christopherson --- arch/x86/kvm/svm/sev.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index c10c71608208..1bdcc5bef7c3 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -1035,19 +1035,18 @@ static int sev_launch_update_vmsa(struct kvm *kvm, = struct kvm_sev_cmd *argp) if (kvm_is_vcpu_creation_in_progress(kvm)) return -EBUSY; =20 - kvm_for_each_vcpu(i, vcpu, kvm) { - ret =3D mutex_lock_killable(&vcpu->mutex); - if (ret) - return ret; + ret =3D kvm_lock_all_vcpus(kvm); + if (ret) + return ret; =20 + kvm_for_each_vcpu(i, vcpu, kvm) { ret =3D __sev_launch_update_vmsa(kvm, vcpu, &argp->error); - - mutex_unlock(&vcpu->mutex); if (ret) - return ret; + break; } =20 - return 0; + kvm_unlock_all_vcpus(kvm); + return ret; } =20 static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp) --=20 2.53.0.473.g4a7958ca14-goog