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KVM: arm64: selftests: Add a test case for a linked breakpoint

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Currently, the debug-exceptions test doesn't have a test case for
a linked breakpoint. Add a test case for the linked breakpoint to
the test. The new test case uses a pair of breakpoints. One is the
higiest numbered context-aware breakpoint (for Context ID match),
and the other one is the breakpoint#0 (for Address Match), 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/20221020054202.2119018-8-reijiw@google.com
This commit is contained in:
Reiji Watanabe
2022-10-19 22:42:00 -07:00
committed by Marc Zyngier
parent 5dd544e882
commit 142365932f
1 changed files with 57 additions and 6 deletions
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63
tools/testing/selftests/kvm/aarch64/debug-exceptions.c
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@@ -12,6 +12,10 @@
#define DBGBCR_EXEC (0x0 << 3)
#define DBGBCR_EL1 (0x1 << 1)
#define DBGBCR_E (0x1 << 0)
#define DBGBCR_LBN_SHIFT 16
#define DBGBCR_BT_SHIFT 20
#define DBGBCR_BT_ADDR_LINK_CTX (0x1 << DBGBCR_BT_SHIFT)
#define DBGBCR_BT_CTX_LINK (0x3 << DBGBCR_BT_SHIFT)
#define DBGWCR_LEN8 (0xff << 5)
#define DBGWCR_RD (0x1 << 3)
@@ -22,7 +26,7 @@
#define SPSR_D (1 << 9)
#define SPSR_SS (1 << 21)
extern unsigned char sw_bp, sw_bp2, hw_bp, hw_bp2, bp_svc, bp_brk, hw_wp, ss_start;
extern unsigned char sw_bp, sw_bp2, hw_bp, hw_bp2, bp_svc, bp_brk, hw_wp, ss_start, hw_bp_ctx;
extern unsigned char iter_ss_begin, iter_ss_end;
static volatile uint64_t sw_bp_addr, hw_bp_addr;
static volatile uint64_t wp_addr, wp_data_addr;
@@ -105,6 +109,7 @@ static void reset_debug_state(void)
isb();
write_sysreg(0, mdscr_el1);
write_sysreg(0, contextidr_el1);
/* Reset all bcr/bvr/wcr/wvr registers */
dfr0 = read_sysreg(id_aa64dfr0_el1);
@@ -166,6 +171,31 @@ static void install_hw_bp(uint8_t bpn, uint64_t addr)
enable_monitor_debug_exceptions();
}
void install_hw_bp_ctx(uint8_t addr_bp, uint8_t ctx_bp, uint64_t addr,
uint64_t ctx)
{
uint32_t addr_bcr, 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 normal breakpoint for Linked Address Match, and link it
* to the context-aware breakpoint.
*/
addr_bcr = DBGBCR_LEN8 | DBGBCR_EXEC | DBGBCR_EL1 | DBGBCR_E |
DBGBCR_BT_ADDR_LINK_CTX |
((uint32_t)ctx_bp << DBGBCR_LBN_SHIFT);
write_dbgbcr(addr_bp, addr_bcr);
write_dbgbvr(addr_bp, addr);
isb();
enable_monitor_debug_exceptions();
}
static void install_ss(void)
{
uint32_t mdscr;
@@ -179,8 +209,10 @@ static void install_ss(void)
static volatile char write_data;
static void guest_code(uint8_t bpn, uint8_t wpn)
static void guest_code(uint8_t bpn, uint8_t wpn, uint8_t ctx_bpn)
{
uint64_t ctx = 0xabcdef; /* a random context number */
/* Software-breakpoint */
reset_debug_state();
asm volatile("sw_bp: brk #0");
@@ -263,6 +295,17 @@ static void guest_code(uint8_t bpn, uint8_t wpn)
: : : "x0");
GUEST_ASSERT_EQ(ss_addr[0], 0);
/* Linked hardware-breakpoint */
hw_bp_addr = 0;
reset_debug_state();
install_hw_bp_ctx(bpn, ctx_bpn, PC(hw_bp_ctx), ctx);
/* Set context id */
write_sysreg(ctx, contextidr_el1);
isb();
asm volatile("hw_bp_ctx: nop");
write_sysreg(0, contextidr_el1);
GUEST_ASSERT_EQ(hw_bp_addr, PC(hw_bp_ctx));
GUEST_DONE();
}
@@ -342,11 +385,12 @@ static int debug_version(uint64_t id_aa64dfr0)
return FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_DEBUGVER), id_aa64dfr0);
}
static void test_guest_debug_exceptions(void)
static void test_guest_debug_exceptions(uint64_t aa64dfr0)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
struct ucall uc;
uint8_t brp_num;
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
ucall_init(vm, NULL);
@@ -365,8 +409,15 @@ static void test_guest_debug_exceptions(void)
vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT,
ESR_EC_SVC64, guest_svc_handler);
/* Run tests with breakpoint#0 and watchpoint#0. */
vcpu_args_set(vcpu, 2, 0, 0);
/* Number of breakpoints */
brp_num = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_BRPS), aa64dfr0) + 1;
__TEST_REQUIRE(brp_num >= 2, "At least two breakpoints are required");
/*
* Run tests with breakpoint#0, watchpoint#0, and the higiest
* numbered (context-aware) breakpoint.
*/
vcpu_args_set(vcpu, 3, 0, 0, brp_num - 1);
vcpu_run(vcpu);
switch (get_ucall(vcpu, &uc)) {
@@ -483,7 +534,7 @@ int main(int argc, char *argv[])
}
}
test_guest_debug_exceptions();
test_guest_debug_exceptions(aa64dfr0);
test_single_step_from_userspace(ss_iteration);
return 0;