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From: Julien Grall <julien@xen.org>
To: xen-devel@lists.xenproject.org
Cc: marco.solieri@minervasys.tech, lucmiccio@gmail.com,
	carlo.nonato@minervasys.tech, Julien Grall <jgrall@amazon.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Julien Grall <julien@xen.org>,
	Bertrand Marquis <bertrand.marquis@arm.com>,
	Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
Subject: [RFC v2 08/12] xen/arm: mm: Allow xen_pt_update() to work with the current root table
Date: Sat, 22 Oct 2022 16:04:18 +0100	[thread overview]
Message-ID: <20221022150422.17707-9-julien@xen.org> (raw)
In-Reply-To: <20221022150422.17707-1-julien@xen.org>

From: Julien Grall <jgrall@amazon.com>

At the moment, xen_pt_update() will only work on the runtime page tables.
In follow-up patches, we will also want to use the helper to update
the boot page tables.

All the existing callers of xen_pt_update() expects to modify the
current page-tables. Therefore, we can read the root physical address
directly from TTBR0_EL2.

Signed-off-by: Julien Grall <jgrall@amazon.com>
----

    Changes in v2:
        - Patch added
---
 xen/arch/arm/mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 2c6648a0dfe5..a3f604e0e2d1 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1123,7 +1123,7 @@ static int xen_pt_update(unsigned long virt,
      *
      * XXX: Add a check.
      */
-    const mfn_t root = virt_to_mfn(THIS_CPU_PGTABLE);
+    const mfn_t root = maddr_to_mfn(READ_SYSREG64(TTBR0_EL2));
 
     /*
      * The hardware was configured to forbid mapping both writeable and
-- 
2.37.1



  parent reply	other threads:[~2022-10-22 15:04 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-22 15:04 [RFC v2 00/12] xen/arm: Don't switch TTBR while the MMU is on Julien Grall
2022-10-22 15:04 ` [RFC v2 01/12] xen/arm: Clean-up the memory layout Julien Grall
2022-10-24 14:59   ` Luca Fancellu
2022-10-25  9:21   ` Michal Orzel
2022-10-25 10:31     ` Julien Grall
2022-10-25 10:36       ` Michal Orzel
2022-10-25 20:07         ` Julien Grall
2022-10-22 15:04 ` [RFC v2 02/12] xen/arm32: head: Jump to the runtime mapping in enable_mmu() Julien Grall
2022-10-25  9:45   ` Michal Orzel
2022-10-25 10:05     ` Julien Grall
2022-10-22 15:04 ` [RFC v2 03/12] xen/arm32: head: Introduce an helper to flush the TLBs Julien Grall
2022-10-25  9:53   ` Michal Orzel
2022-10-25 10:41     ` Julien Grall
2022-10-22 15:04 ` [RFC v2 04/12] xen/arm32: head: Remove restriction where to load Xen Julien Grall
2022-10-25 11:56   ` Luca Fancellu
2022-11-17 20:18     ` Julien Grall
2022-11-25 15:50       ` Luca Fancellu
2022-12-06 18:29         ` Julien Grall
2022-10-22 15:04 ` [RFC v2 05/12] xen/arm32: head: Widen the use of the temporary mapping Julien Grall
2022-10-22 15:04 ` [RFC v2 06/12] xen/arm: Enable use of dump_pt_walk() early during boot Julien Grall
2022-10-22 15:04 ` [RFC v2 07/12] xen/arm64: Rework the memory layout Julien Grall
2022-10-22 15:04 ` Julien Grall [this message]
2022-10-22 15:04 ` [RFC v2 09/12] xen/arm: mm: Allow dump_hyp_walk() to work on the current root table Julien Grall
2022-10-22 15:04 ` [RFC v2 10/12] xen/arm64: mm: Introduce helpers to prepare/enable/disable the identity mapping Julien Grall
2022-10-22 15:04 ` [RFC v2 11/12] xen/arm64: mm: Rework switch_ttbr() Julien Grall
2022-10-22 15:04 ` [RFC v2 12/12] xen/arm64: smpboot: Directly switch to the runtime page-tables Julien Grall
2022-10-24 15:39 ` [RFC v2 00/12] xen/arm: Don't switch TTBR while the MMU is on Xenia Ragiadakou
2022-10-24 15:46   ` Julien Grall

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