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Thu, 21 Nov 2019 11:21:19 +0000 (UTC) Subject: Re: [PATCH 02/15] s390x: Beautify diag308 handling To: Janosch Frank , qemu-devel@nongnu.org References: <20191120114334.2287-1-frankja@linux.ibm.com> <20191120114334.2287-3-frankja@linux.ibm.com> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: Date: Thu, 21 Nov 2019 12:21:18 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20191120114334.2287-3-frankja@linux.ibm.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-MC-Unique: ze7zzMfuMS6UnVNXoLFRwg-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=WINDOWS-1252; format=flowed Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thuth@redhat.com, pmorel@linux.ibm.com, cohuck@redhat.com, borntraeger@de.ibm.com, qemu-s390x@nongnu.org, mihajlov@linux.ibm.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 20.11.19 12:43, Janosch Frank wrote: > Let's improve readability by: > * Using constants for the subcodes > * Moving parameter checking into a function > * Removing subcode > 6 check as the default case catches that >=20 > Signed-off-by: Janosch Frank > --- > target/s390x/diag.c | 54 +++++++++++++++++++++++++++------------------ > 1 file changed, 32 insertions(+), 22 deletions(-) >=20 > diff --git a/target/s390x/diag.c b/target/s390x/diag.c > index 53c2f81f2a..067c667ba7 100644 > --- a/target/s390x/diag.c > +++ b/target/s390x/diag.c > @@ -53,6 +53,29 @@ int handle_diag_288(CPUS390XState *env, uint64_t r1, u= int64_t r3) > #define DIAG_308_RC_NO_CONF 0x0102 > #define DIAG_308_RC_INVALID 0x0402 > =20 > +#define DIAG308_RES_MOD_CLR=09=090 > +#define DIAG308_RES_LOAD_NORM=09=091 > +#define DIAG308_LOAD_CLEAR=09=093 > +#define DIAG308_LOAD_NORMAL_DUMP=094 > +#define DIAG308_SET=09=09=095 > +#define DIAG308_STORE=09=09=096 > + > +static int diag308_parm_check(CPUS390XState *env, uint64_t r1, uint64_t = addr, > + uintptr_t ra, bool write) > +{ > + if ((r1 & 1) || (addr & ~TARGET_PAGE_MASK)) { > + s390_program_interrupt(env, PGM_SPECIFICATION, ra); > + return -EINVAL; > + } > + if (!address_space_access_valid(&address_space_memory, addr, > + sizeof(IplParameterBlock), write, > + MEMTXATTRS_UNSPECIFIED)) { > + s390_program_interrupt(env, PGM_ADDRESSING, ra); > + return -EINVAL; > + } > + return 0; > +} > + > void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uint= ptr_t ra) > { > CPUState *cs =3D env_cpu(env); > @@ -65,30 +88,24 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1,= uint64_t r3, uintptr_t ra) > return; > } > =20 > - if ((subcode & ~0x0ffffULL) || (subcode > 6)) { > + if (subcode & ~0x0ffffULL) { Strange, the default case in the switch was basically dead code. > s390_program_interrupt(env, PGM_SPECIFICATION, ra); > return; > } > =20 > switch (subcode) { > - case 0: > + case DIAG308_RES_MOD_CLR: > s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR); > break; > - case 1: > + case DIAG308_RES_LOAD_NORM: > s390_ipl_reset_request(cs, S390_RESET_LOAD_NORMAL); > break; > - case 3: > + case DIAG308_LOAD_CLEAR: > + /* Well we still lack the clearing bit... */ > s390_ipl_reset_request(cs, S390_RESET_REIPL); > break; > - case 5: > - if ((r1 & 1) || (addr & 0x0fffULL)) { > - s390_program_interrupt(env, PGM_SPECIFICATION, ra); > - return; > - } > - if (!address_space_access_valid(&address_space_memory, addr, > - sizeof(IplParameterBlock), false= , > - MEMTXATTRS_UNSPECIFIED)) { > - s390_program_interrupt(env, PGM_ADDRESSING, ra); > + case DIAG308_SET: > + if (diag308_parm_check(env, r1, addr, ra, false)) { > return; > } > iplb =3D g_new0(IplParameterBlock, 1); > @@ -110,15 +127,8 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1= , uint64_t r3, uintptr_t ra) > out: > g_free(iplb); > return; > - case 6: > - if ((r1 & 1) || (addr & 0x0fffULL)) { > - s390_program_interrupt(env, PGM_SPECIFICATION, ra); > - return; > - } > - if (!address_space_access_valid(&address_space_memory, addr, > - sizeof(IplParameterBlock), true, > - MEMTXATTRS_UNSPECIFIED)) { > - s390_program_interrupt(env, PGM_ADDRESSING, ra); > + case DIAG308_STORE: > + if (diag308_parm_check(env, r1, addr, ra, true)) { > return; > } > iplb =3D s390_ipl_get_iplb(); >=20 Reviewed-by: David Hildenbrand --=20 Thanks, David / dhildenb