Commit f2e91e87 authored by Sean Christopherson's avatar Sean Christopherson
Browse files

KVM: selftests: Add x86 helpers to play nice with x2APIC MSR #GPs 

Add helpers to allow and expect #GP on x2APIC MSRs, and opportunistically
have the existing helper spit out a more useful error message if an
unexpected exception occurs.

Link: https://lore.kernel.org/r/20240719235107.3023592-7-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent ed24ba6c

tools/testing/selftests/kvm/include/x86_64/apic.h

+20 −1
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <stdint.h>



#include "processor.h"

#include "ucall_common.h"



#define APIC_DEFAULT_GPA		0xfee00000ULL
@@ -93,9 +94,27 @@ static inline uint64_t x2apic_read_reg(unsigned int reg) 
	return rdmsr(APIC_BASE_MSR + (reg >> 4));

}



static inline uint8_t x2apic_write_reg_safe(unsigned int reg, uint64_t value)

{

	return wrmsr_safe(APIC_BASE_MSR + (reg >> 4), value);

}



static inline void x2apic_write_reg(unsigned int reg, uint64_t value)

{

	wrmsr(APIC_BASE_MSR + (reg >> 4), value);

	uint8_t fault = x2apic_write_reg_safe(reg, value);



	__GUEST_ASSERT(!fault, "Unexpected fault 0x%x on WRMSR(%x) = %lx\n",

		       fault, APIC_BASE_MSR + (reg >> 4), value);

}



static inline void x2apic_write_reg_fault(unsigned int reg, uint64_t value)

{

	uint8_t fault = x2apic_write_reg_safe(reg, value);



	__GUEST_ASSERT(fault == GP_VECTOR,

		       "Wanted #GP on WRMSR(%x) = %lx, got 0x%x\n",

		       APIC_BASE_MSR + (reg >> 4), value, fault);

}





#endif /* SELFTEST_KVM_APIC_H */