github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-28 17:13:52 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

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

Browse Source 
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>
This commit is contained in:
Sean Christopherson 2024-07-19 16:51:03 -07:00
parent ed24ba6c2c
commit f2e91e8741
1 changed files with 21 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
tools/testing/selftests/kvm/include/x86_64/apic.h
View File

@ -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 void x2apic_write_reg(unsigned int reg, uint64_t value)
static inline uint8_t x2apic_write_reg_safe(unsigned int reg, uint64_t value)
{
wrmsr(APIC_BASE_MSR + (reg >> 4), value);
return wrmsr_safe(APIC_BASE_MSR + (reg >> 4), value);
}
static inline void x2apic_write_reg(unsigned int reg, uint64_t 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 */