From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:35348 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751911AbdBEHhP (ORCPT ); Sun, 5 Feb 2017 02:37:15 -0500 Subject: Patch "KVM: x86: do not save guest-unsupported XSAVE state" has been added to the 4.9-stable tree To: rkrcmar@redhat.com, gregkh@linuxfoundation.org, pbonzini@redhat.com Cc: , From: Date: Sun, 05 Feb 2017 08:37:13 +0100 Message-ID: <148628023330212@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled KVM: x86: do not save guest-unsupported XSAVE state to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-x86-do-not-save-guest-unsupported-xsave-state.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 00c87e9a70a17b355b81c36adedf05e84f54e10d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Date: Wed, 1 Feb 2017 14:19:53 +0100 Subject: KVM: x86: do not save guest-unsupported XSAVE state MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Radim Krčmář commit 00c87e9a70a17b355b81c36adedf05e84f54e10d upstream. Saving unsupported state prevents migration when the new host does not support a XSAVE feature of the original host, even if the feature is not exposed to the guest. We've masked host features with guest-visible features before, with 4344ee981e21 ("KVM: x86: only copy XSAVE state for the supported features") and dropped it when implementing XSAVES. Do it again. Fixes: df1daba7d1cb ("KVM: x86: support XSAVES usage in the host") Reviewed-by: Paolo Bonzini Signed-off-by: Radim Krčmář Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/x86.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3148,6 +3148,7 @@ static void fill_xsave(u8 *dest, struct memcpy(dest, xsave, XSAVE_HDR_OFFSET); /* Set XSTATE_BV */ + xstate_bv &= vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FPSSE; *(u64 *)(dest + XSAVE_HDR_OFFSET) = xstate_bv; /* Patches currently in stable-queue which might be from rkrcmar@redhat.com are queue-4.9/kvm-x86-do-not-save-guest-unsupported-xsave-state.patch