[PATCH v3 0/2] target/arm: allow DC CVA[D]P in user mode emulation

[PATCH v3 0/2] target/arm: allow DC CVA[D]P in user mode emulation

[Zhuojia Shen]

This patch series enables executing DC CVAP and DC CVADP instructions in
AArch64 Linux user mode emulation and adds proper TCG tests.

Changes in v3:
- Fix typo of HWCAP2_DCPODP
- Split tests into a separate patch
- Remove unnecessary handling of SIGILL in tests
- Merge 4 tests into 2

Changes in v2:
- Fix code to deal with unmapped address
- Add tests for DC'ing unmapped address

Zhuojia Shen (2):
  target/arm: allow DC CVA[D]P in user mode emulation
  tests/tcg/aarch64: add DC CVA[D]P tests

 target/arm/helper.c               |  6 ++--
 tests/tcg/aarch64/Makefile.target | 11 ++++++
 tests/tcg/aarch64/dcpodp.c        | 58 +++++++++++++++++++++++++++++++
 tests/tcg/aarch64/dcpop.c         | 58 +++++++++++++++++++++++++++++++
 4 files changed, 129 insertions(+), 4 deletions(-)
 create mode 100644 tests/tcg/aarch64/dcpodp.c
 create mode 100644 tests/tcg/aarch64/dcpop.c

-- 
2.40.1

[PATCH v3 1/2] target/arm: allow DC CVA[D]P in user mode emulation

[Zhuojia Shen]

DC CVAP and DC CVADP instructions can be executed in EL0 on Linux,
either directly when SCTLR_EL1.UCI == 1 or emulated by the kernel (see
user_cache_maint_handler() in arch/arm64/kernel/traps.c).

This patch enables execution of the two instructions in user mode
emulation.

Signed-off-by: Zhuojia Shen <chaosdefinition@hotmail.com>
---
 target/arm/helper.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 0b7fd2e7e6..d4bee43bd0 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -7405,7 +7405,6 @@ static const ARMCPRegInfo rndr_reginfo[] = {
       .access = PL0_R, .readfn = rndr_readfn },
 };
 
-#ifndef CONFIG_USER_ONLY
 static void dccvap_writefn(CPUARMState *env, const ARMCPRegInfo *opaque,
                           uint64_t value)
 {
@@ -7420,6 +7419,7 @@ static void dccvap_writefn(CPUARMState *env, const ARMCPRegInfo *opaque,
     /* This won't be crossing page boundaries */
     haddr = probe_read(env, vaddr, dline_size, mem_idx, GETPC());
     if (haddr) {
+#ifndef CONFIG_USER_ONLY
 
         ram_addr_t offset;
         MemoryRegion *mr;
@@ -7430,6 +7430,7 @@ static void dccvap_writefn(CPUARMState *env, const ARMCPRegInfo *opaque,
         if (mr) {
             memory_region_writeback(mr, offset, dline_size);
         }
+#endif /*CONFIG_USER_ONLY*/
     }
 }
 
@@ -7448,7 +7449,6 @@ static const ARMCPRegInfo dcpodp_reg[] = {
       .fgt = FGT_DCCVADP,
       .accessfn = aa64_cacheop_poc_access, .writefn = dccvap_writefn },
 };
-#endif /*CONFIG_USER_ONLY*/
 
 static CPAccessResult access_aa64_tid5(CPUARMState *env, const ARMCPRegInfo *ri,
                                        bool isread)
@@ -9092,7 +9092,6 @@ void register_cp_regs_for_features(ARMCPU *cpu)
     if (cpu_isar_feature(aa64_tlbios, cpu)) {
         define_arm_cp_regs(cpu, tlbios_reginfo);
     }
-#ifndef CONFIG_USER_ONLY
     /* Data Cache clean instructions up to PoP */
     if (cpu_isar_feature(aa64_dcpop, cpu)) {
         define_one_arm_cp_reg(cpu, dcpop_reg);
@@ -9101,7 +9100,6 @@ void register_cp_regs_for_features(ARMCPU *cpu)
             define_one_arm_cp_reg(cpu, dcpodp_reg);
         }
     }
-#endif /*CONFIG_USER_ONLY*/
 
     /*
      * If full MTE is enabled, add all of the system registers.
-- 
2.40.1

Re: [PATCH v3 1/2] target/arm: allow DC CVA[D]P in user mode emulation

[Peter Maydell]

On Fri, 19 May 2023 at 22:55, Zhuojia Shen <chaosdefinition@hotmail.com> wrote:
>
> DC CVAP and DC CVADP instructions can be executed in EL0 on Linux,
> either directly when SCTLR_EL1.UCI == 1 or emulated by the kernel (see
> user_cache_maint_handler() in arch/arm64/kernel/traps.c).
>
> This patch enables execution of the two instructions in user mode
> emulation.
>
> Signed-off-by: Zhuojia Shen <chaosdefinition@hotmail.com>

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM

[PATCH v3 2/2] tests/tcg/aarch64: add DC CVA[D]P tests

[Zhuojia Shen]

Test execution of DC CVAP and DC CVADP instructions under user mode
emulation.

Signed-off-by: Zhuojia Shen <chaosdefinition@hotmail.com>
---
 tests/tcg/aarch64/Makefile.target | 11 ++++++
 tests/tcg/aarch64/dcpodp.c        | 58 +++++++++++++++++++++++++++++++
 tests/tcg/aarch64/dcpop.c         | 58 +++++++++++++++++++++++++++++++
 3 files changed, 127 insertions(+)
 create mode 100644 tests/tcg/aarch64/dcpodp.c
 create mode 100644 tests/tcg/aarch64/dcpop.c

diff --git a/tests/tcg/aarch64/Makefile.target b/tests/tcg/aarch64/Makefile.target
index 0315795487..3430fd3cd8 100644
--- a/tests/tcg/aarch64/Makefile.target
+++ b/tests/tcg/aarch64/Makefile.target
@@ -21,12 +21,23 @@ config-cc.mak: Makefile
 	$(quiet-@)( \
 	    $(call cc-option,-march=armv8.1-a+sve,          CROSS_CC_HAS_SVE); \
 	    $(call cc-option,-march=armv8.1-a+sve2,         CROSS_CC_HAS_SVE2); \
+	    $(call cc-option,-march=armv8.2-a,              CROSS_CC_HAS_ARMV8_2); \
 	    $(call cc-option,-march=armv8.3-a,              CROSS_CC_HAS_ARMV8_3); \
+	    $(call cc-option,-march=armv8.5-a,              CROSS_CC_HAS_ARMV8_5); \
 	    $(call cc-option,-mbranch-protection=standard,  CROSS_CC_HAS_ARMV8_BTI); \
 	    $(call cc-option,-march=armv8.5-a+memtag,       CROSS_CC_HAS_ARMV8_MTE); \
 	    $(call cc-option,-march=armv9-a+sme,            CROSS_CC_HAS_ARMV9_SME)) 3> config-cc.mak
 -include config-cc.mak
 
+ifneq ($(CROSS_CC_HAS_ARMV8_2),)
+AARCH64_TESTS += dcpop
+dcpop: CFLAGS += -march=armv8.2-a
+endif
+ifneq ($(CROSS_CC_HAS_ARMV8_5),)
+AARCH64_TESTS += dcpodp
+dcpodp: CFLAGS += -march=armv8.5-a
+endif
+
 # Pauth Tests
 ifneq ($(CROSS_CC_HAS_ARMV8_3),)
 AARCH64_TESTS += pauth-1 pauth-2 pauth-4 pauth-5
diff --git a/tests/tcg/aarch64/dcpodp.c b/tests/tcg/aarch64/dcpodp.c
new file mode 100644
index 0000000000..6f6301ac86
--- /dev/null
+++ b/tests/tcg/aarch64/dcpodp.c
@@ -0,0 +1,58 @@
+/* Test execution of DC CVADP instruction */
+
+#include <asm/hwcap.h>
+#include <sys/auxv.h>
+
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef HWCAP2_DCPODP
+#define HWCAP2_DCPODP (1 << 0)
+#endif
+
+bool should_fail = false;
+
+static void signal_handler(int sig, siginfo_t *si, void *data)
+{
+    ucontext_t *uc = (ucontext_t *)data;
+
+    if (should_fail) {
+        uc->uc_mcontext.pc += 4;
+    } else {
+        exit(EXIT_FAILURE);
+    }
+}
+
+static int do_dc_cvadp(void)
+{
+    struct sigaction sa = {
+        .sa_flags = SA_SIGINFO,
+        .sa_sigaction = signal_handler,
+    };
+
+    sigemptyset(&sa.sa_mask);
+    if (sigaction(SIGSEGV, &sa, NULL) < 0) {
+        perror("sigaction");
+        return EXIT_FAILURE;
+    }
+
+    asm volatile("dc cvadp, %0\n\t" :: "r"(&sa));
+
+    should_fail = true;
+    asm volatile("dc cvadp, %0\n\t" :: "r"(NULL));
+    should_fail = false;
+
+    return EXIT_SUCCESS;
+}
+
+int main(void)
+{
+    if (getauxval(AT_HWCAP2) & HWCAP2_DCPODP) {
+        return do_dc_cvadp();
+    } else {
+        printf("SKIP: no HWCAP2_DCPODP on this system\n");
+        return EXIT_SUCCESS;
+    }
+}
diff --git a/tests/tcg/aarch64/dcpop.c b/tests/tcg/aarch64/dcpop.c
new file mode 100644
index 0000000000..0c4d32cfe7
--- /dev/null
+++ b/tests/tcg/aarch64/dcpop.c
@@ -0,0 +1,58 @@
+/* Test execution of DC CVAP instruction */
+
+#include <asm/hwcap.h>
+#include <sys/auxv.h>
+
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef HWCAP_DCPOP
+#define HWCAP_DCPOP (1 << 16)
+#endif
+
+bool should_fail = false;
+
+static void signal_handler(int sig, siginfo_t *si, void *data)
+{
+    ucontext_t *uc = (ucontext_t *)data;
+
+    if (should_fail) {
+        uc->uc_mcontext.pc += 4;
+    } else {
+        exit(EXIT_FAILURE);
+    }
+}
+
+static int do_dc_cvap(void)
+{
+    struct sigaction sa = {
+        .sa_flags = SA_SIGINFO,
+        .sa_sigaction = signal_handler,
+    };
+
+    sigemptyset(&sa.sa_mask);
+    if (sigaction(SIGSEGV, &sa, NULL) < 0) {
+        perror("sigaction");
+        return EXIT_FAILURE;
+    }
+
+    asm volatile("dc cvap, %0\n\t" :: "r"(&sa));
+
+    should_fail = true;
+    asm volatile("dc cvap, %0\n\t" :: "r"(NULL));
+    should_fail = false;
+
+    return EXIT_SUCCESS;
+}
+
+int main(void)
+{
+    if (getauxval(AT_HWCAP) & HWCAP_DCPOP) {
+        return do_dc_cvap();
+    } else {
+        printf("SKIP: no HWCAP_DCPOP on this system\n");
+        return EXIT_SUCCESS;
+    }
+}
-- 
2.40.1

Re: [PATCH v3 2/2] tests/tcg/aarch64: add DC CVA[D]P tests

[Peter Maydell]

On Fri, 19 May 2023 at 23:12, Zhuojia Shen <chaosdefinition@hotmail.com> wrote:
>
> Test execution of DC CVAP and DC CVADP instructions under user mode
> emulation.
>
> Signed-off-by: Zhuojia Shen <chaosdefinition@hotmail.com>
> ---
>  tests/tcg/aarch64/Makefile.target | 11 ++++++
>  tests/tcg/aarch64/dcpodp.c        | 58 +++++++++++++++++++++++++++++++
>  tests/tcg/aarch64/dcpop.c         | 58 +++++++++++++++++++++++++++++++
>  3 files changed, 127 insertions(+)
>  create mode 100644 tests/tcg/aarch64/dcpodp.c
>  create mode 100644 tests/tcg/aarch64/dcpop.c

> diff --git a/tests/tcg/aarch64/dcpodp.c b/tests/tcg/aarch64/dcpodp.c
> new file mode 100644
> index 0000000000..6f6301ac86
> --- /dev/null
> +++ b/tests/tcg/aarch64/dcpodp.c
> @@ -0,0 +1,58 @@
> +/* Test execution of DC CVADP instruction */

All new files should start with the standard brief
comment stating the copyright and license.

Otherwise
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM

[PATCH v3 1/2] target/arm: allow DC CVA[D]P in user mode emulation

[Zhuojia Shen]

DC CVAP and DC CVADP instructions can be executed in EL0 on Linux,
either directly when SCTLR_EL1.UCI == 1 or emulated by the kernel (see
user_cache_maint_handler() in arch/arm64/kernel/traps.c).

This patch enables execution of the two instructions in user mode
emulation.

Signed-off-by: Zhuojia Shen <chaosdefinition@hotmail.com>
---
 target/arm/helper.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 0b7fd2e7e6..d4bee43bd0 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -7405,7 +7405,6 @@ static const ARMCPRegInfo rndr_reginfo[] = {
       .access = PL0_R, .readfn = rndr_readfn },
 };
 
-#ifndef CONFIG_USER_ONLY
 static void dccvap_writefn(CPUARMState *env, const ARMCPRegInfo *opaque,
                           uint64_t value)
 {
@@ -7420,6 +7419,7 @@ static void dccvap_writefn(CPUARMState *env, const ARMCPRegInfo *opaque,
     /* This won't be crossing page boundaries */
     haddr = probe_read(env, vaddr, dline_size, mem_idx, GETPC());
     if (haddr) {
+#ifndef CONFIG_USER_ONLY
 
         ram_addr_t offset;
         MemoryRegion *mr;
@@ -7430,6 +7430,7 @@ static void dccvap_writefn(CPUARMState *env, const ARMCPRegInfo *opaque,
         if (mr) {
             memory_region_writeback(mr, offset, dline_size);
         }
+#endif /*CONFIG_USER_ONLY*/
     }
 }
 
@@ -7448,7 +7449,6 @@ static const ARMCPRegInfo dcpodp_reg[] = {
       .fgt = FGT_DCCVADP,
       .accessfn = aa64_cacheop_poc_access, .writefn = dccvap_writefn },
 };
-#endif /*CONFIG_USER_ONLY*/
 
 static CPAccessResult access_aa64_tid5(CPUARMState *env, const ARMCPRegInfo *ri,
                                        bool isread)
@@ -9092,7 +9092,6 @@ void register_cp_regs_for_features(ARMCPU *cpu)
     if (cpu_isar_feature(aa64_tlbios, cpu)) {
         define_arm_cp_regs(cpu, tlbios_reginfo);
     }
-#ifndef CONFIG_USER_ONLY
     /* Data Cache clean instructions up to PoP */
     if (cpu_isar_feature(aa64_dcpop, cpu)) {
         define_one_arm_cp_reg(cpu, dcpop_reg);
@@ -9101,7 +9100,6 @@ void register_cp_regs_for_features(ARMCPU *cpu)
             define_one_arm_cp_reg(cpu, dcpodp_reg);
         }
     }
-#endif /*CONFIG_USER_ONLY*/
 
     /*
      * If full MTE is enabled, add all of the system registers.
-- 
2.40.1