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| author | Reiji Watanabe <reijiw@google.com> | 2022-10-20 08:42:01 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-11-10 22:03:54 +0300 |
| commit | 5ced4e533b676b1a582d89aba5328e4b316957e0 (patch) | |
| tree | f13f3e8ac9aa9414a291e430873034a16ff81044 /tools/testing/selftests/kvm/aarch64/debug-exceptions.c | |
| parent | 142365932f5f296df593dd653d79194ff5457722 (diff) | |
| download | linux-5ced4e533b676b1a582d89aba5328e4b316957e0.tar.xz | |
KVM: arm64: selftests: Add a test case for a linked watchpoint
Currently, the debug-exceptions test doesn't have a test case for
a linked watchpoint. Add a test case for the linked watchpoint to
the test. The new test case uses the highest numbered context-aware
breakpoint (for Context ID match), and the watchpoint#0, which is
linked to the context-aware breakpoint.
Signed-off-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221020054202.2119018-9-reijiw@google.com
Diffstat (limited to 'tools/testing/selftests/kvm/aarch64/debug-exceptions.c')
| -rw-r--r-- | tools/testing/selftests/kvm/aarch64/debug-exceptions.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/aarch64/debug-exceptions.c b/tools/testing/selftests/kvm/aarch64/debug-exceptions.c index 362e7668a978..73a95e6b345e 100644 --- a/tools/testing/selftests/kvm/aarch64/debug-exceptions.c +++ b/tools/testing/selftests/kvm/aarch64/debug-exceptions.c @@ -22,6 +22,9 @@ #define DBGWCR_WR (0x2 << 3) #define DBGWCR_EL1 (0x1 << 1) #define DBGWCR_E (0x1 << 0) +#define DBGWCR_LBN_SHIFT 16 +#define DBGWCR_WT_SHIFT 20 +#define DBGWCR_WT_LINK (0x1 << DBGWCR_WT_SHIFT) #define SPSR_D (1 << 9) #define SPSR_SS (1 << 21) @@ -171,6 +174,28 @@ static void install_hw_bp(uint8_t bpn, uint64_t addr) enable_monitor_debug_exceptions(); } +static void install_wp_ctx(uint8_t addr_wp, uint8_t ctx_bp, uint64_t addr, + uint64_t ctx) +{ + uint32_t wcr; + uint64_t ctx_bcr; + + /* Setup a context-aware breakpoint for Linked Context ID Match */ + ctx_bcr = DBGBCR_LEN8 | DBGBCR_EXEC | DBGBCR_EL1 | DBGBCR_E | + DBGBCR_BT_CTX_LINK; + write_dbgbcr(ctx_bp, ctx_bcr); + write_dbgbvr(ctx_bp, ctx); + + /* Setup a linked watchpoint (linked to the context-aware breakpoint) */ + wcr = DBGWCR_LEN8 | DBGWCR_RD | DBGWCR_WR | DBGWCR_EL1 | DBGWCR_E | + DBGWCR_WT_LINK | ((uint32_t)ctx_bp << DBGWCR_LBN_SHIFT); + write_dbgwcr(addr_wp, wcr); + write_dbgwvr(addr_wp, addr); + isb(); + + enable_monitor_debug_exceptions(); +} + void install_hw_bp_ctx(uint8_t addr_bp, uint8_t ctx_bp, uint64_t addr, uint64_t ctx) { @@ -306,6 +331,16 @@ static void guest_code(uint8_t bpn, uint8_t wpn, uint8_t ctx_bpn) write_sysreg(0, contextidr_el1); GUEST_ASSERT_EQ(hw_bp_addr, PC(hw_bp_ctx)); + /* Linked watchpoint */ + reset_debug_state(); + install_wp_ctx(wpn, ctx_bpn, PC(write_data), ctx); + /* Set context id */ + write_sysreg(ctx, contextidr_el1); + isb(); + write_data = 'x'; + GUEST_ASSERT_EQ(write_data, 'x'); + GUEST_ASSERT_EQ(wp_data_addr, PC(write_data)); + GUEST_DONE(); } |