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Re: [Xen-devel] [PATCH for-4.13] xen/arm: Implement workaround for Cortex A-57 and Cortex A72 AT speculate



Hi Volodymyr,

On 24/09/2019 15:06, Volodymyr Babchuk wrote:


Julien Grall writes:

Both Cortex-A57 (erratum 1319537) and Cortex-A72 (erratum 1319367) can
end with corrupt TLBs if they speculate an AT instruction while S1/S2
system registers in inconsistent state.

The workaround is the same as for Cortex A-76 implemented by commit
a18be06aca "xen/arm: Implement workaround for Cortex-A76 erratum 1165522",
so it is only necessary to plumb in the cpuerrata framework.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
With a few nits:

Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>

---
  docs/misc/arm/silicon-errata.txt |  2 ++
  xen/arch/arm/cpuerrata.c         | 10 ++++++++++
  2 files changed, 12 insertions(+)

diff --git a/docs/misc/arm/silicon-errata.txt b/docs/misc/arm/silicon-errata.txt
index 6cd1366f15..cf193a6d4d 100644
--- a/docs/misc/arm/silicon-errata.txt
+++ b/docs/misc/arm/silicon-errata.txt
@@ -48,5 +48,7 @@ stable hypervisors.
  | ARM            | Cortex-A57      | #852523         | N/A                    
 |
  | ARM            | Cortex-A57      | #832075         | ARM64_ERRATUM_832075   
 |
  | ARM            | Cortex-A57      | #834220         | ARM64_ERRATUM_834220   
 |
+| ARM            | Cortex-A57      | #1319537        | N/A
+| ARM            | Cortex-A72      | #1319367        | N/A
Looks like you missed the last |.

I will do it.


Also, is this "ARM" or "Arm"? I believe you asked me to user the latter.

This patch needs to be backported, so I felt it was better to keep consistency for now. I can add a patch on top to rename all of them.


  | ARM            | Cortex-A76      | #1165522        | N/A                    
 |
  | ARM            | MMU-500         | #842869         | N/A                    
 |
diff --git a/xen/arch/arm/cpuerrata.c b/xen/arch/arm/cpuerrata.c
index 6f483b2d8d..da72b02442 100644
--- a/xen/arch/arm/cpuerrata.c
+++ b/xen/arch/arm/cpuerrata.c
@@ -481,6 +481,16 @@ static const struct arm_cpu_capabilities arm_errata[] = {
          .capability = ARM64_WORKAROUND_AT_SPECULATE,
          MIDR_RANGE(MIDR_CORTEX_A76, 0, 2 << MIDR_VARIANT_SHIFT),
      },
+    {
+        .desc = "ARM erratum 1319537",
+        .capability = ARM64_WORKAROUND_AT_SPECULATE,
+        MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
+    },
+    {
+        .desc = "ARM erratum 1319367",
+        .capability = ARM64_WORKAROUND_AT_SPECULATE,
+        MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
+    },
      {},
  };



Cheers,

--
Julien Grall

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