[PATCH v2 02/18] arm64: Add CNTVCT_EL0 trap handler

[Marc Zyngier]

Since people seem to make a point in breaking the userspace visible
counter, we have no choice but to trap the access. Add the required
handler.

Acked-by: Mark Rutland <mark.rutl...@arm.com>
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
---
 arch/arm64/include/asm/esr.h |  2 ++
 arch/arm64/kernel/traps.c    | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h
index d14c478976d0..ad42e79a5d4d 100644
--- a/arch/arm64/include/asm/esr.h
+++ b/arch/arm64/include/asm/esr.h
@@ -175,6 +175,8 @@
 #define ESR_ELx_SYS64_ISS_SYS_CTR_READ (ESR_ELx_SYS64_ISS_SYS_CTR | \
                                         ESR_ELx_SYS64_ISS_DIR_READ)
 
+#define ESR_ELx_SYS64_ISS_SYS_CNTVCT   (ESR_ELx_SYS64_ISS_SYS_VAL(3, 3, 2, 14, 
0) | \
+                                        ESR_ELx_SYS64_ISS_DIR_READ)
 #ifndef __ASSEMBLY__
 #include <asm/types.h>
 
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index e52be6aa44ee..1de444e6c669 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -505,6 +505,14 @@ static void ctr_read_handler(unsigned int esr, struct 
pt_regs *regs)
        regs->pc += 4;
 }
 
+static void cntvct_read_handler(unsigned int esr, struct pt_regs *regs)
+{
+       int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> 
ESR_ELx_SYS64_ISS_RT_SHIFT;
+
+       pt_regs_write_reg(regs, rt, arch_counter_get_cntvct());
+       regs->pc += 4;
+}
+
 struct sys64_hook {
        unsigned int esr_mask;
        unsigned int esr_val;
@@ -523,6 +531,12 @@ static struct sys64_hook sys64_hooks[] = {
                .esr_val = ESR_ELx_SYS64_ISS_SYS_CTR_READ,
                .handler = ctr_read_handler,
        },
+       {
+               /* Trap read access to CNTVCT_EL0 */
+               .esr_mask = ESR_ELx_SYS64_ISS_SYS_OP_MASK,
+               .esr_val = ESR_ELx_SYS64_ISS_SYS_CNTVCT,
+               .handler = cntvct_read_handler,
+       },
        {},
 };
 
-- 
2.11.0