From: Julien Grall <julien@xen.org>
To: xen-devel@lists.xenproject.org
Cc: michal.orzel@amd.com, Luca.Fancellu@arm.com,
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: [PATCH v3 13/18] xen/arm: mm: Allow xen_pt_update() to work with the current root table
Date: Mon, 12 Dec 2022 09:55:18 +0000 [thread overview]
Message-ID: <20221212095523.52683-14-julien@xen.org> (raw)
In-Reply-To: <20221212095523.52683-1-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 cc11f5c639e6..26d6b70410c5 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1114,7 +1114,7 @@ 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
--
2.38.1
next prev parent reply other threads:[~2022-12-12 10:17 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-12 9:55 [PATCH v3 00/18] xen/arm: Don't switch TTBR while the MMU is on Julien Grall
2022-12-12 9:55 ` [PATCH v3 01/18] xen/arm64: flushtlb: Reduce scope of barrier for local TLB flush Julien Grall
2022-12-13 9:11 ` Michal Orzel
2022-12-13 9:45 ` Julien Grall
2022-12-13 9:50 ` Michal Orzel
2023-01-23 16:19 ` Ayan Kumar Halder
2022-12-12 9:55 ` [PATCH v3 02/18] xen/arm64: flushtlb: Implement the TLBI repeat workaround for TLB flush by VA Julien Grall
2022-12-13 9:23 ` Michal Orzel
2022-12-12 9:55 ` [PATCH v3 03/18] xen/arm32: flushtlb: Reduce scope of barrier for local TLB flush Julien Grall
2022-12-13 10:48 ` Michal Orzel
2022-12-12 9:55 ` [PATCH v3 04/18] xen/arm: flushtlb: Reduce scope of barrier for the TLB range flush Julien Grall
2022-12-13 11:15 ` Michal Orzel
2022-12-12 9:55 ` [PATCH v3 05/18] xen/arm: Clean-up the memory layout Julien Grall
2022-12-13 10:57 ` Michal Orzel
2022-12-13 11:00 ` Michal Orzel
2022-12-12 9:55 ` [PATCH v3 06/18] xen/arm32: head: Replace "ldr rX, =<label>" with "mov_w rX, <label>" Julien Grall
2022-12-13 0:31 ` Stefano Stabellini
2022-12-13 11:10 ` Michal Orzel
2022-12-12 9:55 ` [PATCH v3 07/18] xen/arm32: head: Jump to the runtime mapping in enable_mmu() Julien Grall
2022-12-13 0:46 ` Stefano Stabellini
2022-12-12 9:55 ` [PATCH v3 08/18] xen/arm32: head: Introduce an helper to flush the TLBs Julien Grall
2022-12-14 14:24 ` Michal Orzel
2023-01-12 19:38 ` Julien Grall
2022-12-12 9:55 ` [PATCH v3 09/18] xen/arm32: head: Remove restriction where to load Xen Julien Grall
2022-12-13 18:23 ` Julien Grall
2022-12-12 9:55 ` [PATCH v3 10/18] xen/arm32: head: Widen the use of the temporary mapping Julien Grall
2022-12-12 9:55 ` [PATCH v3 11/18] xen/arm: Enable use of dump_pt_walk() early during boot Julien Grall
2022-12-13 1:06 ` Stefano Stabellini
2022-12-12 9:55 ` [PATCH v3 12/18] xen/arm64: Rework the memory layout Julien Grall
2022-12-13 1:22 ` Stefano Stabellini
2022-12-13 18:31 ` Julien Grall
2022-12-12 9:55 ` Julien Grall [this message]
2022-12-13 1:24 ` [PATCH v3 13/18] xen/arm: mm: Allow xen_pt_update() to work with the current root table Stefano Stabellini
2022-12-12 9:55 ` [PATCH v3 14/18] xen/arm: mm: Allow dump_hyp_walk() to work on " Julien Grall
2022-12-13 1:24 ` Stefano Stabellini
2022-12-12 9:55 ` [PATCH v3 15/18] xen/arm64: mm: Introduce helpers to prepare/enable/disable the identity mapping Julien Grall
2022-12-13 1:41 ` Stefano Stabellini
2023-01-12 22:03 ` Julien Grall
2022-12-12 9:55 ` [PATCH v3 16/18] xen/arm: linker: Indent correctly _stext Julien Grall
2022-12-13 1:42 ` Stefano Stabellini
2022-12-12 9:55 ` [PATCH v3 17/18] xen/arm: linker: The identitymap check should cover the whole .text.header Julien Grall
2022-12-13 1:44 ` Stefano Stabellini
2022-12-12 9:55 ` [PATCH v3 18/18] xen/arm64: mm: Rework switch_ttbr() Julien Grall
2022-12-13 2:00 ` Stefano Stabellini
2022-12-13 19:08 ` Julien Grall
2022-12-13 22:56 ` Stefano Stabellini
2022-12-13 23:01 ` Julien Grall
2022-12-15 11:48 ` [PATCH v3 00/18] xen/arm: Don't switch TTBR while the MMU is on Julien Grall
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