From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EF63976058; Mon, 8 Apr 2024 13:16:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712582212; cv=none; b=BOt/JHShROqVgqAI9wrqo9vE29A303Hc1Kny/Ec9W7p1S1pCN6h6VgCjaFQsVOqu1LbsDFh5HPs7NZZyW7bbK93XZum2i/mKhHMX2cL2kbnJ9vcTp0NFykpayx9O1eVQfYzpn7YrK26kJXDMTpcoPb69Gsi7ODIRA+/MYsUi668= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712582212; c=relaxed/simple; bh=wbryKzqPkaebgv6vTOV5OT4IAkI9p0N7ky+5aeqU6DU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cJ8aNvRLjar23YQxaOWLQuQ3HFf5HRe458I2bU3rhwDg+St3+GANaFwgDrJkHRD8cdLsA9g/QYeIVBLACL353R/htrXd3ntstKEQAyZz8bpgQXlMhHfprHaoTuRpoZiOBl3TdSfTidPR61w99crcD20ksDv5Z+beqcZTz8xYl9w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=hJgrO+01; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="hJgrO+01" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 77137C433C7; Mon, 8 Apr 2024 13:16:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1712582211; bh=wbryKzqPkaebgv6vTOV5OT4IAkI9p0N7ky+5aeqU6DU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hJgrO+01SEPQqbwLY6Z1dfAm0E1WMufsAT3sd14ushy7NOmE07Z9A4vMeUs+YYx8t InFnCVaDsvlrE85TLlosn74uo195cEOLHlN/unBFKIRROeV+xJug94D+FEGA9sWCRu RsD08fiaYCwNJyEuNf4/NIRar8A74nw+8Tve8mEc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tom Lendacky , Sean Christopherson , Sasha Levin Subject: [PATCH 6.1 087/138] KVM: SVM: Use unsigned integers when dealing with ASIDs Date: Mon, 8 Apr 2024 14:58:21 +0200 Message-ID: <20240408125258.931580758@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240408125256.218368873@linuxfoundation.org> References: <20240408125256.218368873@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sean Christopherson [ Upstream commit 466eec4a22a76c462781bf6d45cb02cbedf21a61 ] Convert all local ASID variables and parameters throughout the SEV code from signed integers to unsigned integers. As ASIDs are fundamentally unsigned values, and the global min/max variables are appropriately unsigned integers, too. Functionally, this is a glorified nop as KVM guarantees min_sev_asid is non-zero, and no CPU supports -1u as the _only_ asid, i.e. the signed vs. unsigned goof won't cause problems in practice. Opportunistically use sev_get_asid() in sev_flush_encrypted_page() instead of open coding an equivalent. Reviewed-by: Tom Lendacky Link: https://lore.kernel.org/r/20240131235609.4161407-3-seanjc@google.com Signed-off-by: Sean Christopherson Stable-dep-of: 0aa6b90ef9d7 ("KVM: SVM: Add support for allowing zero SEV ASIDs") Signed-off-by: Sasha Levin --- arch/x86/kvm/svm/sev.c | 18 ++++++++++-------- arch/x86/kvm/trace.h | 10 +++++----- 2 files changed, 15 insertions(+), 13 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 0316fdf5040f7..9e50eaf967f22 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -76,9 +76,10 @@ struct enc_region { }; /* Called with the sev_bitmap_lock held, or on shutdown */ -static int sev_flush_asids(int min_asid, int max_asid) +static int sev_flush_asids(unsigned int min_asid, unsigned int max_asid) { - int ret, asid, error = 0; + int ret, error = 0; + unsigned int asid; /* Check if there are any ASIDs to reclaim before performing a flush */ asid = find_next_bit(sev_reclaim_asid_bitmap, nr_asids, min_asid); @@ -108,7 +109,7 @@ static inline bool is_mirroring_enc_context(struct kvm *kvm) } /* Must be called with the sev_bitmap_lock held */ -static bool __sev_recycle_asids(int min_asid, int max_asid) +static bool __sev_recycle_asids(unsigned int min_asid, unsigned int max_asid) { if (sev_flush_asids(min_asid, max_asid)) return false; @@ -135,8 +136,9 @@ static void sev_misc_cg_uncharge(struct kvm_sev_info *sev) static int sev_asid_new(struct kvm_sev_info *sev) { - int asid, min_asid, max_asid, ret; + unsigned int asid, min_asid, max_asid; bool retry = true; + int ret; WARN_ON(sev->misc_cg); sev->misc_cg = get_current_misc_cg(); @@ -179,7 +181,7 @@ static int sev_asid_new(struct kvm_sev_info *sev) return ret; } -static int sev_get_asid(struct kvm *kvm) +static unsigned int sev_get_asid(struct kvm *kvm) { struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; @@ -276,8 +278,8 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp) static int sev_bind_asid(struct kvm *kvm, unsigned int handle, int *error) { + unsigned int asid = sev_get_asid(kvm); struct sev_data_activate activate; - int asid = sev_get_asid(kvm); int ret; /* activate ASID on the given handle */ @@ -2290,7 +2292,7 @@ int sev_cpu_init(struct svm_cpu_data *sd) */ static void sev_flush_encrypted_page(struct kvm_vcpu *vcpu, void *va) { - int asid = to_kvm_svm(vcpu->kvm)->sev_info.asid; + unsigned int asid = sev_get_asid(vcpu->kvm); /* * Note! The address must be a kernel address, as regular page walk @@ -2611,7 +2613,7 @@ void sev_es_unmap_ghcb(struct vcpu_svm *svm) void pre_sev_run(struct vcpu_svm *svm, int cpu) { struct svm_cpu_data *sd = per_cpu_ptr(&svm_data, cpu); - int asid = sev_get_asid(svm->vcpu.kvm); + unsigned int asid = sev_get_asid(svm->vcpu.kvm); /* Assign the asid allocated with this SEV guest */ svm->asid = asid; diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h index bc25589ad5886..6c1dcf44c4fa3 100644 --- a/arch/x86/kvm/trace.h +++ b/arch/x86/kvm/trace.h @@ -729,13 +729,13 @@ TRACE_EVENT(kvm_nested_intr_vmexit, * Tracepoint for nested #vmexit because of interrupt pending */ TRACE_EVENT(kvm_invlpga, - TP_PROTO(__u64 rip, int asid, u64 address), + TP_PROTO(__u64 rip, unsigned int asid, u64 address), TP_ARGS(rip, asid, address), TP_STRUCT__entry( - __field( __u64, rip ) - __field( int, asid ) - __field( __u64, address ) + __field( __u64, rip ) + __field( unsigned int, asid ) + __field( __u64, address ) ), TP_fast_assign( @@ -744,7 +744,7 @@ TRACE_EVENT(kvm_invlpga, __entry->address = address; ), - TP_printk("rip: 0x%016llx asid: %d address: 0x%016llx", + TP_printk("rip: 0x%016llx asid: %u address: 0x%016llx", __entry->rip, __entry->asid, __entry->address) ); -- 2.43.0