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x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: 9aRAf2ARsQVOzObqupFfxU3QpYt4Vs/I9oSKXX3xWLakzEzIq1AfhtKQmVi2gdYLMT/E5eos2L 6ebiRzc5rMuWKHDM3k09OXXPDqf0G8wouNIieQ/BF0g8mjHTivNEw1JN1LkUSSB6MySgF+f/yi 9qAudeJ2jE25M/musySF6AZ8rCeoEJkPGHf+56QOn0PlUgUFR9RZ5qiBsLcv8Eh13jQRO5OMBG F6nVfM1/f7cu0/AGYfhvAeOEkq90BAEYUeL7HiJika2RaqgoVBzq1NuYvICS/XrdQNWfXJiklp Upk= X-SBRS: 2.7 X-MesageID: 5742443 X-Ironport-Server: esa4.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="5742443" From: Andrew Cooper To: Xen-devel Date: Wed, 11 Sep 2019 21:05:00 +0100 Message-ID: <20190911200504.5693-5-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 4/8] tools/libxc: Pre-cleanup for xc_cpuid_{set, apply_policy}() 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 , Ian Jackson , 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) This patch is broken out just to simplify the following two. For xc_cpuid_set(), document how the 'k' works because it is quite subtle. Replace a memset() with weird calculation for a loop of 4 explicit NULL assigments. This mirrors the free()'s in the fail path. For xc_cpuid_apply_policy(), const-ify the featureset pointer. It isn't written to, and was never intended to be mutable. Drop three pieces of trailing whitespace. No functional change. Signed-off-by: Andrew Cooper Reviewed-by: Jan Beulich --- CC: Jan Beulich CC: Wei Liu CC: Roger Pau Monn=C3=A9 CC: Ian Jackson --- tools/libxc/include/xenctrl.h | 2 +- tools/libxc/xc_cpuid_x86.c | 21 ++++++++++++++------- 2 files changed, 15 insertions(+), 8 deletions(-) diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h index e47778535d..2419a47f22 100644 --- a/tools/libxc/include/xenctrl.h +++ b/tools/libxc/include/xenctrl.h @@ -1800,7 +1800,7 @@ int xc_cpuid_set(xc_interface *xch, char **config_transformed); int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, - uint32_t *featureset, + const uint32_t *featureset, unsigned int nr_features); int xc_mca_op(xc_interface *xch, struct xen_mc *mc); int xc_mca_op_inject_v2(xc_interface *xch, unsigned int flags, diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c index 33b9e9fc85..a2d29a0fae 100644 --- a/tools/libxc/xc_cpuid_x86.c +++ b/tools/libxc/xc_cpuid_x86.c @@ -1,5 +1,5 @@ /*************************************************************************= ***** - * xc_cpuid_x86.c=20 + * xc_cpuid_x86.c * * Compute cpuid of a domain. * @@ -332,7 +332,7 @@ static void cpuid(const unsigned int *input, unsigned i= nt *regs) =20 static int get_cpuid_domain_info(xc_interface *xch, uint32_t domid, struct cpuid_domain_info *info, - uint32_t *featureset, + const uint32_t *featureset, unsigned int nr_features) { struct xen_domctl domctl =3D {}; @@ -807,8 +807,7 @@ static void sanitise_featureset(struct cpuid_domain_inf= o *info) } =20 int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, - uint32_t *featureset, - unsigned int nr_features) + const uint32_t *featureset, unsigned int nr_feat= ures) { struct cpuid_domain_info info =3D {}; unsigned int input[2] =3D { 0, 0 }, regs[4]; @@ -898,7 +897,7 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t d= omid, * 'k' -> pass through host value * 's' -> pass through the first time and then keep the same value * across save/restore and migration. - *=20 + * * For 's' and 'x' the configuration is overwritten with the value applied. */ int xc_cpuid_set( @@ -909,7 +908,8 @@ int xc_cpuid_set( unsigned int i, j, regs[4], polregs[4]; struct cpuid_domain_info info =3D {}; =20 - memset(config_transformed, 0, 4 * sizeof(*config_transformed)); + for ( i =3D 0; i < 4; ++i ) + config_transformed[i] =3D NULL; =20 rc =3D get_cpuid_domain_info(xch, domid, &info, NULL, 0); if ( rc ) @@ -927,7 +927,7 @@ int xc_cpuid_set( regs[i] =3D polregs[i]; continue; } - =20 + config_transformed[i] =3D calloc(33, 1); /* 32 bits, NUL terminato= r. */ if ( config_transformed[i] =3D=3D NULL ) { @@ -935,6 +935,13 @@ int xc_cpuid_set( goto fail; } =20 + /* + * Notes for following this algorithm: + * + * While it will accept any leaf data, it only makes sense to use = on + * feature leaves. regs[] initially contains the host values. Th= is, + * with the fall-through chain is how the 'k' option works. + */ for ( j =3D 0; j < 32; j++ ) { unsigned char val =3D !!((regs[i] & (1U << (31 - j)))); --=20 2.11.0 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel