From: Julien Grall <julien@xen.org>
To: xen-devel@lists.xenproject.org
Cc: bertrand.marquis@arm.com,
Stefano Stabellini <sstabellini@kernel.org>,
Julien Grall <julien@xen.org>,
Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
Stefano Stabellini <stefano.stabellini@xilinx.com>,
Julien Grall <jgrall@amazon.com>
Subject: [PATCH RFC 1/6] xen/arm: mm: Remove special case for CPU0 in dump_hyp_walk()
Date: Thu, 19 Nov 2020 19:07:46 +0000 [thread overview]
Message-ID: <20201119190751.22345-2-julien@xen.org> (raw)
In-Reply-To: <20201119190751.22345-1-julien@xen.org>
From: Stefano Stabellini <sstabellini@kernel.org>
There is no need to have a special case for CPU0 when converting the
page-table virtual address into a physical address. The helper
virt_to_maddr() is able to translate any address as long as the root
page-tables is mapped in the virtual address. This is the case for all
the CPUs at the moment.
So use the same BUG_ON() regardless the CPU.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
[julien: Rework the commit message]
Signed-off-by: Julien Grall <jgrall@amazon.com>
---
I went back through the conversation in [1] regarding the issue when
loading Xen below 2MB on Arm32. The example provided is wrong because to
find the physical address, we need to add 'phys_offset', not substract.
So I removed the comment regarding the code was buggy.
[1] https://marc.info/?l=xen-devel&m=157081398022401
---
xen/arch/arm/mm.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 9c4b26bf079b..4dd886f7c80d 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -284,10 +284,7 @@ void dump_hyp_walk(vaddr_t addr)
"on CPU%d via TTBR 0x%016"PRIx64"\n",
addr, smp_processor_id(), ttbr);
- if ( smp_processor_id() == 0 )
- BUG_ON( (lpae_t *)(unsigned long)(ttbr - phys_offset) != pgtable );
- else
- BUG_ON( virt_to_maddr(pgtable) != ttbr );
+ BUG_ON( virt_to_maddr(pgtable) != ttbr );
dump_pt_walk(ttbr, addr, HYP_PT_ROOT_LEVEL, 1);
}
--
2.17.1
next prev parent reply other threads:[~2020-11-19 19:08 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-19 19:07 [PATCH RFC 0/6] xen/arm: mm: Add limited support for superpages Julien Grall
2020-11-19 19:07 ` Julien Grall [this message]
2020-11-24 17:10 ` [PATCH RFC 1/6] xen/arm: mm: Remove special case for CPU0 in dump_hyp_walk() Bertrand Marquis
2020-11-28 11:14 ` Julien Grall
2020-11-30 21:58 ` Stefano Stabellini
2020-11-19 19:07 ` [PATCH RFC 2/6] xen/arm: mm: Remove ; at the end of mm_printk() Julien Grall
2020-11-20 0:41 ` Stefano Stabellini
2020-11-24 12:19 ` Bertrand Marquis
2020-11-19 19:07 ` [PATCH RFC 3/6] xen/arm: setup: Call unregister_init_virtual_region() after the last init function Julien Grall
2020-11-24 13:25 ` Bertrand Marquis
2020-11-19 19:07 ` [PATCH RFC 4/6] xen/arm: mm: Allow other mapping size in xen_pt_update_entry() Julien Grall
2020-11-20 1:46 ` Stefano Stabellini
2020-11-20 16:09 ` Julien Grall
2020-11-23 22:27 ` Stefano Stabellini
2020-11-23 23:23 ` Julien Grall
2020-11-24 0:25 ` Stefano Stabellini
2020-11-28 11:53 ` Julien Grall
2020-11-30 22:05 ` Stefano Stabellini
2021-04-25 15:11 ` Julien Grall
2020-11-24 18:13 ` Bertrand Marquis
2020-11-25 18:03 ` Julien Grall
2020-11-19 19:07 ` [PATCH RFC 5/6] xen/arm: mm: Don't open-code Xen PT update in remove_early_mappings Julien Grall
2020-11-20 1:47 ` Stefano Stabellini
2020-11-19 19:07 ` [PATCH RFC 6/6] xen/arm: mm: Re-implement early_fdt_map() using map_pages_to_xen() Julien Grall
2020-11-20 1:54 ` Stefano Stabellini
2021-01-23 11:44 ` [PATCH RFC 0/6] xen/arm: mm: Add limited support for superpages Julien Grall
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