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Wed, 15 Jan 2020 17:05:01 +0000 (UTC) Received: from [10.36.117.108] (ovpn-117-108.ams2.redhat.com [10.36.117.108]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B50C75D9C9; Wed, 15 Jan 2020 17:04:58 +0000 (UTC) Subject: Re: [kvm-unit-tests PATCH v2 14/16] arm/run: Allow Migration tests To: Andrew Jones References: <20200110145412.14937-1-eric.auger@redhat.com> <20200110145412.14937-15-eric.auger@redhat.com> <20200113184055.tu3qqpsc72xqfw6t@kamzik.brq.redhat.com> From: Auger Eric Message-ID: <58be5530-e8a1-633d-0d69-dd7e9e420138@redhat.com> Date: Wed, 15 Jan 2020 18:04:57 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20200113184055.tu3qqpsc72xqfw6t@kamzik.brq.redhat.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Cc: thuth@redhat.com, kvm@vger.kernel.org, maz@kernel.org, qemu-devel@nongnu.org, qemu-arm@nongnu.org, andre.przywara@arm.com, kvmarm@lists.cs.columbia.edu, eric.auger.pro@gmail.com X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Hi Drew, On 1/13/20 7:40 PM, Andrew Jones wrote: > On Fri, Jan 10, 2020 at 03:54:10PM +0100, Eric Auger wrote: >> Let's link getchar.o to use puts and getchar from the >> tests. >> >> Then allow tests belonging to the migration group to >> trigger the migration from the test code by putting >> "migrate" into the uart. Then the code can wait for the >> migration completion by using getchar(). >> >> The __getchar implement is minimalist as it just reads the >> data register. It is just meant to read the single character >> emitted at the end of the migration by the runner script. >> >> It is not meant to read more data (FIFOs are not enabled). >> >> Signed-off-by: Eric Auger >> Reviewed-by: Thomas Huth >> --- >> arm/Makefile.common | 2 +- >> arm/run | 2 +- >> lib/arm/io.c | 13 +++++++++++++ >> 3 files changed, 15 insertions(+), 2 deletions(-) >> >> diff --git a/arm/Makefile.common b/arm/Makefile.common >> index 7cc0f04..327f112 100644 >> --- a/arm/Makefile.common >> +++ b/arm/Makefile.common >> @@ -32,7 +32,7 @@ CFLAGS += -I $(SRCDIR)/lib -I $(SRCDIR)/lib/libfdt -I lib >> asm-offsets = lib/$(ARCH)/asm-offsets.h >> include $(SRCDIR)/scripts/asm-offsets.mak >> >> -cflatobjs += lib/util.o >> +cflatobjs += lib/util.o lib/getchar.o >> cflatobjs += lib/alloc_phys.o >> cflatobjs += lib/alloc_page.o >> cflatobjs += lib/vmalloc.o >> diff --git a/arm/run b/arm/run >> index 277db9b..a390ca5 100755 >> --- a/arm/run >> +++ b/arm/run >> @@ -61,6 +61,6 @@ fi >> M+=",accel=$ACCEL" >> command="$qemu -nodefaults $M -cpu $processor $chr_testdev $pci_testdev" >> command+=" -display none -serial stdio -kernel" >> -command="$(timeout_cmd) $command" >> +command="$(migration_cmd) $(timeout_cmd) $command" >> >> run_qemu $command "$@" >> diff --git a/lib/arm/io.c b/lib/arm/io.c >> index 99fd315..ed89e19 100644 >> --- a/lib/arm/io.c >> +++ b/lib/arm/io.c >> @@ -87,6 +87,19 @@ void puts(const char *s) >> spin_unlock(&uart_lock); >> } >> >> +/* >> + * Minimalist implementation for migration completion detection. >> + * Needs to be improved for more advanced Rx cases > > Please add that QEMU supports reading a maximum of 16 characters in > this minimal mode. We could even add a counter and then assert if > we try to read 16 or more. > >> + */ >> +int __getchar(void) >> +{ >> + int ret; >> + >> + ret = readb(uart0_base); >> + if (!ret) >> + return -1; >> + return ret; >> +} > > What about taking the lock? > >> >> /* >> * Defining halt to take 'code' as an argument guarantees that it will >> -- >> 2.20.1 >> > > What do you think of the __getchar below? > > Thanks, > drew > > > diff --git a/lib/arm/io.c b/lib/arm/io.c > index 99fd31560084..77beb331d6b2 100644 > --- a/lib/arm/io.c > +++ b/lib/arm/io.c > @@ -79,6 +79,31 @@ void io_init(void) > chr_testdev_init(); > } > > +static int ____getchar(void) > +{ > + int c; > + > + spin_lock(&uart_lock); > + c = readb(uart0_base); > + spin_unlock(&uart_lock); > + > + return c ?: -1; > +} > + > +int __getchar(void) > +{ > + static int count; > + int c; > + > + if ((c = ____getchar()) != -1) > + ++count; > + > + /* Without special UART initialization we can only read 16 characters. */ > + assert(count < 16); > + > + return c; > +} > + > void puts(const char *s) > { > spin_lock(&uart_lock); > Yep, I will take your improved version. Thanks Eric _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm