From: Andrew Jones <drjones@redhat.com>
To: Auger Eric <eric.auger@redhat.com>
Cc: peter.maydell@linaro.org, thuth@redhat.com, kvm@vger.kernel.org,
maz@kernel.org, qemu-devel@nongnu.org, qemu-arm@nongnu.org,
andre.przywara@arm.com, Zenghui Yu <yuzenghui@huawei.com>,
alexandru.elisei@arm.com, kvmarm@lists.cs.columbia.edu,
eric.auger.pro@gmail.com
Subject: Re: [kvm-unit-tests PATCH v7 06/13] arm/arm64: ITS: Introspection tests
Date: Mon, 30 Mar 2020 11:11:39 +0200 [thread overview]
Message-ID: <20200330091139.i2d6vv64f5diamlz@kamzik.brq.redhat.com> (raw)
In-Reply-To: <8878be7f-7653-b427-cd0d-722f82fb6b65@redhat.com>
On Mon, Mar 30, 2020 at 10:46:57AM +0200, Auger Eric wrote:
> Hi Zenghui,
>
> On 3/30/20 10:30 AM, Zenghui Yu wrote:
> > Hi Eric,
> >
> > On 2020/3/20 17:24, Eric Auger wrote:
> >> +static void its_cmd_queue_init(void)
> >> +{
> >> + unsigned long order = get_order(SZ_64K >> PAGE_SHIFT);
> >> + u64 cbaser;
> >> +
> >> + its_data.cmd_base = (void *)virt_to_phys(alloc_pages(order));
> >
> > Shouldn't the cmd_base (and the cmd_write) be set as a GVA?
> yes it should
If it's supposed to be a virtual address, when why do the virt_to_phys?
> >
> > Otherwise I think we will end-up with memory corruption when writing
> > the command queue. But it seems that everything just works fine ...
> > So I'm really confused here :-/
> I was told by Paolo that the VA/PA memory map is flat in kvmunit test.
What does flat mean? kvm-unit-tests, at least arm/arm64, does prepare
an identity map of all physical memory, which explains why the above
is working. It's doing virt_to_phys(some-virt-addr), which gets a
phys addr, but when the ITS uses it as a virt addr it works because
we *also* have a virt addr == phys addr mapping in the default page
table, which is named "idmap" for good reason.
I think it would be better to test with the non-identity mapped addresses
though.
Thanks,
drew
>
> >
> >> +
> >> + cbaser = ((u64)its_data.cmd_base | (SZ_64K / SZ_4K - 1) |
> >> GITS_CBASER_VALID);
> >> +
> >> + writeq(cbaser, its_data.base + GITS_CBASER);
> >> +
> >> + its_data.cmd_write = its_data.cmd_base;
> >> + writeq(0, its_data.base + GITS_CWRITER);
> >> +}
> >
> > Otherwise this looks good,
> > Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
> Thanks!
>
> Eric
> >
> >
> > Thanks
> >
>
>
next prev parent reply other threads:[~2020-03-30 9:12 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-20 9:24 [kvm-unit-tests PATCH v7 00/13] arm/arm64: Add ITS tests Eric Auger
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 01/13] libcflat: Add other size defines Eric Auger
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 02/13] page_alloc: Introduce get_order() Eric Auger
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 03/13] arm/arm64: gic: Introduce setup_irq() helper Eric Auger
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 04/13] arm/arm64: gicv3: Add some re-distributor defines Eric Auger
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 05/13] arm/arm64: gicv3: Set the LPI config and pending tables Eric Auger
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 06/13] arm/arm64: ITS: Introspection tests Eric Auger
2020-03-30 8:30 ` Zenghui Yu
2020-03-30 8:46 ` Auger Eric
2020-03-30 9:11 ` Andrew Jones [this message]
2020-03-30 9:56 ` Auger Eric
2020-03-30 10:19 ` Andrew Jones
2020-03-30 10:24 ` Auger Eric
2020-03-30 12:20 ` Zenghui Yu
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 07/13] arm/arm64: ITS: its_enable_defaults Eric Auger
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 08/13] arm/arm64: ITS: Device and collection Initialization Eric Auger
2020-03-25 8:10 ` Zenghui Yu
2020-03-25 21:20 ` Auger Eric
2020-03-30 9:13 ` Andrew Jones
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 09/13] arm/arm64: ITS: Commands Eric Auger
2020-03-30 9:22 ` Zenghui Yu
2020-03-30 9:57 ` Auger Eric
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 10/13] arm/arm64: ITS: INT functional tests Eric Auger
2020-03-30 10:43 ` Zenghui Yu
2020-04-02 8:50 ` Auger Eric
2020-04-02 12:40 ` Zenghui Yu
2020-04-02 14:41 ` Andrew Jones
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 11/13] arm/run: Allow Migration tests Eric Auger
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 12/13] arm/arm64: ITS: migration tests Eric Auger
2020-03-30 10:55 ` Zenghui Yu
2020-03-20 9:24 ` [kvm-unit-tests PATCH v7 13/13] arm/arm64: ITS: pending table migration test Eric Auger
2020-03-30 12:06 ` Zenghui Yu
2020-03-30 12:38 ` Auger Eric
2020-03-30 13:17 ` Zenghui Yu
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