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Re: [Xen-devel] [PATCH 1/7] xen/arm: Added handling of the trapped access to OSLSR register


You seem to have used a wrong address for me.

Title: This patch is only adding the arm64 side. Please make it clear in it.


On 04/11/2018 02:19 PM, Mirela Simonovic wrote:
Linux/dom0 accesses OSLSR register when saving CPU context during the
suspend procedure. Xen traps access to this register, but has no handling
for it. Consequently, Xen injects undef exception to linux, causing it to
crash. This patch adds handling of the trapped access to OSLSR as ro/raz.

Signed-off-by: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>
  xen/arch/arm/arm64/vsysreg.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/arm64/vsysreg.c b/xen/arch/arm/arm64/vsysreg.c
index c57ac12503..8f80e1735e 100644
--- a/xen/arch/arm/arm64/vsysreg.c
+++ b/xen/arch/arm/arm64/vsysreg.c
@@ -57,13 +57,14 @@ void do_sysreg(struct cpu_user_regs *regs,
       * ARMv8 (DDI 0487A.d): D1-1509 Table D1-58
       * Unhandled:
-     *    OSLSR_EL1
       *    DBGPRCR_EL1
      case HSR_SYSREG_OSLAR_EL1:
          return handle_wo_wi(regs, regidx, hsr.sysreg.read, hsr, 1);
      case HSR_SYSREG_OSDLR_EL1:
          return handle_raz_wi(regs, regidx, hsr.sysreg.read, hsr, 1);
+        return handle_ro_raz(regs, regidx, hsr.sysreg.read, hsr, 1);

       * MDCR_EL2.TDA

Julien Grall
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