TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: selftests: Verify the guest can read back the x2APIC ICR it wrote

Browse Source 
Now that the BUSY bit mess is gone (for x2APIC), verify that the *guest*
can read back the ICR value that it wrote.  Due to the divergent
behavior between AMD and Intel with respect to the backing storage of the
ICR in the vAPIC page, emulating a seemingly simple MSR write is quite
complex.

Link: https://lore.kernel.org/r/20240719235107.3023592-10-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2024-07-19 16:51:06 -07:00
parent 3426cb48ad
commit 0cb26ec320
1 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tools/testing/selftests/kvm/x86_64/xapic_state_test.c
+4 -2
View File
@@ -45,10 +45,12 @@ static void x2apic_guest_code(void)
uint64_t val = x2apic_read_reg(APIC_IRR) |
x2apic_read_reg(APIC_IRR + 0x10) << 32;
if (val & X2APIC_RSVD_BITS_MASK)
if (val & X2APIC_RSVD_BITS_MASK) {
x2apic_write_reg_fault(APIC_ICR, val);
else
} else {
x2apic_write_reg(APIC_ICR, val);
GUEST_ASSERT_EQ(x2apic_read_reg(APIC_ICR), val);
}
GUEST_SYNC(val);
} while (1);
}