Commit 152880d8 authored by Reiji Watanabe's avatar Reiji Watanabe Committed by Marc Zyngier
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KVM: arm64: selftests: Add helpers to enable debug exceptions 



Add helpers to enable breakpoint and watchpoint exceptions.
No functional change intended.

Signed-off-by: default avatarReiji Watanabe <reijiw@google.com>
Reviewed-by: default avatarRicardo Koller <ricarkol@google.com>
Reviewed-by: default avatarOliver Upton <oliver.upton@linux.dev>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221020054202.2119018-5-reijiw@google.com
parent 700b8860

tools/testing/selftests/kvm/aarch64/debug-exceptions.c

+13 −12
Original line number Diff line number Diff line
@@ -130,10 +130,20 @@ static void enable_os_lock(void) 
	GUEST_ASSERT(read_sysreg(oslsr_el1) & 2);

}



static void enable_monitor_debug_exceptions(void)

{

	uint32_t mdscr;



	asm volatile("msr daifclr, #8");



	mdscr = read_sysreg(mdscr_el1) | MDSCR_KDE | MDSCR_MDE;

	write_sysreg(mdscr, mdscr_el1);

	isb();

}



static void install_wp(uint8_t wpn, uint64_t addr)

{

	uint32_t wcr;

	uint32_t mdscr;



	wcr = DBGWCR_LEN8 | DBGWCR_RD | DBGWCR_WR | DBGWCR_EL1 | DBGWCR_E;

	write_dbgwcr(wpn, wcr);
@@ -141,28 +151,19 @@ static void install_wp(uint8_t wpn, uint64_t addr) 


	isb();



	asm volatile("msr daifclr, #8");



	mdscr = read_sysreg(mdscr_el1) | MDSCR_KDE | MDSCR_MDE;

	write_sysreg(mdscr, mdscr_el1);

	isb();

	enable_monitor_debug_exceptions();

}



static void install_hw_bp(uint8_t bpn, uint64_t addr)

{

	uint32_t bcr;

	uint32_t mdscr;



	bcr = DBGBCR_LEN8 | DBGBCR_EXEC | DBGBCR_EL1 | DBGBCR_E;

	write_dbgbcr(bpn, bcr);

	write_dbgbvr(bpn, addr);

	isb();



	asm volatile("msr daifclr, #8");



	mdscr = read_sysreg(mdscr_el1) | MDSCR_KDE | MDSCR_MDE;

	write_sysreg(mdscr, mdscr_el1);

	isb();

	enable_monitor_debug_exceptions();

}



static void install_ss(void)