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From: Shannon Zhao <shannon.zhao@linaro.org>
To: Julien Grall <julien.grall@arm.com>,
	Shannon Zhao <zhaoshenglong@huawei.com>,
	xen-devel@lists.xen.org
Cc: stefano.stabellini@citrix.com, peter.huangpeng@huawei.com
Subject: Re: [PATCH v6 13/22] arm/acpi: Map the new created EFI and ACPI tables to Dom0
Date: Thu, 24 Mar 2016 22:59:44 +0800	[thread overview]
Message-ID: <56F400E0.7030501@linaro.org> (raw)
In-Reply-To: <56F16FD8.4020109@arm.com>

On 2016年03月23日 00:16, Julien Grall wrote:
> Hi Shannon,
> 
> On 22/03/16 13:18, Shannon Zhao wrote:
>> On 2016年03月22日 08:42, Julien Grall wrote:
>>> Hi Shannon,
>>>
>>> On 17/03/2016 09:40, Shannon Zhao wrote:
>>>> From: Shannon Zhao <shannon.zhao@linaro.org>
>>>>
>>>> Map the UEFI and ACPI tables which we created to non-RAM space in Dom0.
>>>>
>>>> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
>>>> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
>>>> ---
>>>>    xen/arch/arm/domain_build.c | 15 +++++++++++++++
>>>>    1 file changed, 15 insertions(+)
>>>>
>>>> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
>>>> index 008fc76..e036887 100644
>>>> --- a/xen/arch/arm/domain_build.c
>>>> +++ b/xen/arch/arm/domain_build.c
>>>> @@ -1691,6 +1691,21 @@ static int prepare_acpi(struct domain *d,
>>>> struct kernel_info *kinfo)
>>>>        acpi_create_efi_mmap_table(d->arch.efi_acpi_gpa,
>>>> d->arch.efi_acpi_len,
>>>>                                   d->arch.efi_acpi_table, &kinfo->mem,
>>>> tbl_add);
>>>>
>>>> +    /* Map the EFI and ACPI tables to Dom0 */
>>>> +    rc = map_regions_rw(d,
>>>> +                        paddr_to_pfn(d->arch.efi_acpi_gpa),
>>>> +                        PFN_UP(d->arch.efi_acpi_len),
>>>> +
>>>> paddr_to_pfn(virt_to_maddr(d->arch.efi_acpi_table)));
>>>
>>> The ACPI/EFI tables could potentially have data in the cache but are not
>>> written into the memory (because Xen is mapping the RAM with caching
>>> enabled). However, DOM0 may decide to map it with cache disabled.
>>> Therefore it would be possible for the domain to see wrong data.
>>>
>>> So I think you need to clean the cache for this region.
>> Oh, that would be good. Is there any existing function I can use?
> 
> You could reuse p2m_cache_flush. However this function will only flush
> cache for p2m_ram_* entries.
> 
> I think the best way would be to extend the CACHEFLUSH operations and
> maybe p2m_cache_flush (?).
So it needs to extend the CACHEFLUSH case to handle the p2m_mmio_direct
entry, right?

BTW, does the case you said exist? Before xen switches to Dom0, will it
invalid the cache?

Thanks,
-- 
Shannon

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  reply	other threads:[~2016-03-24 14:59 UTC|newest]

Thread overview: 79+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-17  9:40 [PATCH v6 00/22] Prepare UEFI and ACPI tables for Dom0 on ARM64 Shannon Zhao
2016-03-17  9:40 ` [PATCH v6 01/22] arm/acpi: Estimate memory required for acpi/efi tables Shannon Zhao
2016-03-18 18:44   ` Julien Grall
2016-03-21 13:01     ` Jan Beulich
2016-03-22 13:01     ` Shannon Zhao
2016-03-22  0:28   ` Julien Grall
2016-03-24 12:36   ` Stefano Stabellini
2016-03-17  9:40 ` [PATCH v6 02/22] arm/acpi: Add a helper function to get the acpi table offset Shannon Zhao
2016-03-21 12:16   ` Julien Grall
2016-03-24 12:32   ` Stefano Stabellini
2016-03-17  9:40 ` [PATCH v6 03/22] arm/acpi: Prepare FADT table for Dom0 Shannon Zhao
2016-03-21 12:25   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 04/22] arm/gic: Add a new callback for creating MADT " Shannon Zhao
2016-03-21 15:18   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 05/22] arm/acpi: Prepare " Shannon Zhao
2016-03-21 15:26   ` Julien Grall
2016-03-21 15:51     ` Jan Beulich
2016-03-17  9:40 ` [PATCH v6 06/22] arm/acpi: Prepare STAO " Shannon Zhao
2016-03-21 15:31   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 07/22] arm/acpi: Prepare XSDT " Shannon Zhao
2016-03-21 15:43   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 08/22] arm/acpi: Prepare RSDP " Shannon Zhao
2016-03-21 15:47   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 09/22] arm/p2m: Add helper functions to map memory regions Shannon Zhao
2016-03-21 15:52   ` Julien Grall
2016-03-22 13:05     ` Shannon Zhao
2016-03-22 15:59       ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 10/22] arm/acpi: Map all other tables for Dom0 Shannon Zhao
2016-03-21 15:57   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 11/22] arm/acpi: Prepare EFI system table " Shannon Zhao
2016-03-21 16:10   ` Julien Grall
2016-03-22 13:06     ` Shannon Zhao
2016-03-22 13:24       ` Jan Beulich
2016-03-17  9:40 ` [PATCH v6 12/22] arm/acpi: Prepare EFI memory descriptor " Shannon Zhao
2016-03-21 16:51   ` Julien Grall
2016-03-22 13:16     ` Shannon Zhao
2016-03-22 16:04       ` Julien Grall
2016-03-24 15:06         ` Shannon Zhao
2016-03-24 15:23           ` Julien Grall
2016-03-24 12:39   ` Stefano Stabellini
2016-03-17  9:40 ` [PATCH v6 13/22] arm/acpi: Map the new created EFI and ACPI tables to Dom0 Shannon Zhao
2016-03-22  0:42   ` Julien Grall
2016-03-22 13:18     ` Shannon Zhao
2016-03-22 16:16       ` Julien Grall
2016-03-24 14:59         ` Shannon Zhao [this message]
2016-03-24 15:35           ` Julien Grall
2016-03-17  9:41 ` [PATCH v6 14/22] arm/acpi: Create min DT stub for Dom0 Shannon Zhao
2016-03-22  1:07   ` Julien Grall
2016-03-22 13:23     ` Shannon Zhao
2016-03-17  9:41 ` [PATCH v6 15/22] arm/acpi: Permit access all Xen unused SPIs " Shannon Zhao
2016-03-22 18:18   ` Julien Grall
2016-03-24 15:01     ` Shannon Zhao
2016-03-24 15:37       ` Julien Grall
2016-03-25  7:13         ` Shannon Zhao
2016-03-17  9:41 ` [PATCH v6 16/22] arm/acpi: Configure SPI interrupt type and route to Dom0 dynamically Shannon Zhao
2016-03-22 19:17   ` Julien Grall
2016-03-24 12:41   ` Stefano Stabellini
2016-03-17  9:41 ` [PATCH v6 17/22] arm/gic: Add a new callback to deny Dom0 access to GIC regions Shannon Zhao
2016-03-22 19:33   ` Julien Grall
2016-03-24 12:45     ` Stefano Stabellini
2016-03-24 15:03       ` Shannon Zhao
2016-03-24 15:39         ` Julien Grall
2016-03-17  9:41 ` [PATCH v6 18/22] arm/acpi: Permit MMIO access of Xen unused devices for Dom0 Shannon Zhao
2016-03-23 11:50   ` Julien Grall
2016-03-17  9:41 ` [PATCH v6 19/22] hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK_IRQ Shannon Zhao
2016-03-17 10:42   ` Jan Beulich
2016-03-17 11:04     ` Shannon Zhao
2016-03-17 11:29       ` Jan Beulich
2016-03-17 11:56         ` Shannon Zhao
2016-03-17 12:42           ` Jan Beulich
2016-03-17  9:41 ` [PATCH v6 20/22] xen/acpi: Fix event-channel interrupt when booting with ACPI Shannon Zhao
2016-03-23 12:15   ` Julien Grall
2016-03-17  9:41 ` [PATCH v6 21/22] xen/arm: Add a hypercall for device mmio mapping Shannon Zhao
2016-03-17  9:41 ` [PATCH v6 22/22] xen/arm64: Add ACPI support Shannon Zhao
2016-03-17 10:52   ` Jan Beulich
2016-03-17 11:03     ` Shannon Zhao
2016-03-17 11:31       ` Jan Beulich
2016-03-17 13:10         ` Shannon Zhao
2016-03-17 13:24           ` Jan Beulich

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