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KVM: selftests: Verify KVM preserves userspace writes to "durable" MSRs

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Assert that KVM provides "read what you wrote" semantics for all "durable"
MSRs (for lack of a better name).  The extra coverage is cheap from a
runtime performance perspective, and verifying the behavior in the common
helper avoids gratuitous copy+paste in individual tests.

Note, this affects all tests that set MSRs from userspace!

Link: https://lore.kernel.org/r/20230311004618.920745-13-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2023-03-10 16:46:09 -08:00
parent 22234c2495
commit f138258565
1 changed files with 16 additions and 1 deletions
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17
tools/testing/selftests/kvm/include/x86_64/processor.h
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@ -945,12 +945,27 @@ do { \
} \
} while (0)
/*
* Returns true if KVM should return the last written value when reading an MSR
* from userspace, e.g. the MSR isn't a command MSR, doesn't emulate state that
* is changing, etc. This is NOT an exhaustive list! The intent is to filter
* out MSRs that are not durable _and_ that a selftest wants to write.
*/
static inline bool is_durable_msr(uint32_t msr)
{
return msr != MSR_IA32_TSC;
}
#define vcpu_set_msr(vcpu, msr, val) \
do { \
uint64_t v = val; \
uint64_t r, v = val; \
\
TEST_ASSERT_MSR(_vcpu_set_msr(vcpu, msr, v) == 1, \
"KVM_SET_MSRS failed on %s, value = 0x%lx", msr, #msr, v); \
if (!is_durable_msr(msr)) \
break; \
r = vcpu_get_msr(vcpu, msr); \
TEST_ASSERT_MSR(r == v, "Set %s to '0x%lx', got back '0x%lx'", msr, #msr, v, r);\
} while (0)
void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits);