tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Sean Christopherson <seanjc@google.com>
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tools/testing/selftests/kvm/include/x86_64/apic.h
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tools/testing/selftests/kvm/include/x86_64/apic.h
···
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#include <stdint.h>
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#include "processor.h"
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#include "ucall_common.h"
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#define APIC_DEFAULT_GPA 0xfee00000ULL
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···
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return rdmsr(APIC_BASE_MSR + (reg >> 4));
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}
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static inline uint8_t x2apic_write_reg_safe(unsigned int reg, uint64_t value)
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{
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return wrmsr_safe(APIC_BASE_MSR + (reg >> 4), value);
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}
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static inline void x2apic_write_reg(unsigned int reg, uint64_t value)
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{
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wrmsr(APIC_BASE_MSR + (reg >> 4), value);
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uint8_t fault = x2apic_write_reg_safe(reg, value);
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__GUEST_ASSERT(!fault, "Unexpected fault 0x%x on WRMSR(%x) = %lx\n",
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fault, APIC_BASE_MSR + (reg >> 4), value);
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}
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static inline void x2apic_write_reg_fault(unsigned int reg, uint64_t value)
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{
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uint8_t fault = x2apic_write_reg_safe(reg, value);
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__GUEST_ASSERT(fault == GP_VECTOR,
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"Wanted #GP on WRMSR(%x) = %lx, got 0x%x\n",
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APIC_BASE_MSR + (reg >> 4), value, fault);
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}
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#endif /* SELFTEST_KVM_APIC_H */