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x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: SjzUhlq534F1vTly/5WySxx/tew3DnAeD2PyBNLhkCbwEx//twfzXMGUUPk98kZhseDlKIDE7y Bc1eh3OdmpWVDDTAXnzCdj4a6uwqk6aEhuioPKHVu1P1AfYyh+Itn9PE0qNcR557RvWvBx8q++ lhcQhK9XvyDdYBxrk3cRKQ4JGEabBjKDwb59LfCWI9zPRP5uyhzHyyBQmqBQq0hPnnYnCxz6EC hI0PG0/C667zF+TM501gak+LO1Bgch6q/x83YhzINafz3XGCEmkrmJeQHdT9rBHhlYIg3FKK0W bfo= X-SBRS: 2.7 X-MesageID: 5506249 X-Ironport-Server: esa1.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.64,494,1559534400"; d="scan'208";a="5506249" From: Andrew Cooper To: Xen-devel Date: Wed, 11 Sep 2019 21:05:04 +0100 Message-ID: <20190911200504.5693-9-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190911200504.5693-1-andrew.cooper3@citrix.com> References: <20190911200504.5693-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH 8/8] x86/cpuid: Enable CPUID Faulting for the control domain X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , Wei Liu , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) The domain builder no longer uses CPUID instructions for policy decisions. Signed-off-by: Andrew Cooper --- CC: Jan Beulich CC: Wei Liu CC: Roger Pau Monn=C3=A9 --- xen/arch/x86/cpu/common.c | 19 ++----------------- 1 file changed, 2 insertions(+), 17 deletions(-) diff --git a/xen/arch/x86/cpu/common.c b/xen/arch/x86/cpu/common.c index 8de4a44c1a..2e883835b8 100644 --- a/xen/arch/x86/cpu/common.c +++ b/xen/arch/x86/cpu/common.c @@ -168,23 +168,8 @@ void ctxt_switch_levelling(const struct vcpu *next) */ if (nextd && is_idle_domain(nextd)) return; - /* - * We *should* be enabling faulting for the control domain. - * - * Unfortunately, the domain builder (having only ever been a - * PV guest) expects to be able to see host cpuid state in a - * native CPUID instruction, to correctly build a CPUID policy - * for HVM guests (notably the xstate leaves). - * - * This logic is fundimentally broken for HVM toolstack - * domains, and faulting causes PV guests to behave like HVM - * guests from their point of view. - * - * Future development plans will move responsibility for - * generating the maximum full cpuid policy into Xen, at which - * this problem will disappear. - */ - set_cpuid_faulting(nextd && !is_control_domain(nextd) && + + set_cpuid_faulting(nextd && (is_pv_domain(nextd) || next->arch.msrs-> misc_features_enables.cpuid_faulting)); --=20 2.11.0 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel