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Don't fault when guest tries to read IA32_EBL_CR_POWERON MSR

PATCH Applied Matthew Gregan 2 participants 2 messages May 3, 2007 – May 6, 2007 1 message not in the archive KVM

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Matthew Gregan

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PATCH 1/1 Don't fault when guest tries to read IA32_EBL_CR_POWERON MSR

Hi,

Attempting to boot the default 'bsd' kernel of OpenBSD 4.1 i386 in a guest fails early in the kernel init inside p3_get_bus_clock while trying to read the IA32_EBL_CR_POWERON MSR. KVM logs an 'unhandled MSR' message and the guest kernel faults.

This patch is sufficient to allow OpenBSD to boot, after which it seems to run fine. I'm not sure if this is the correct solution for dealing with this particular MSR, but it works for me.

Signed-off-by Matthew Gregan <[email protected]>

Cheers,
-mjg

Signature · 2 lines
Matthew Gregan                     |/
                                  /|                    [email protected]
drivers/kvm/kvm_main.c +1 -0
index 93a8eb0..6aa4b40 100644
@@ -1469,6 +1469,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case MSR_IA32_MC0_MISC+16:
 	case MSR_IA32_UCODE_REV:
 	case MSR_IA32_PERF_STATUS:
+	case MSR_IA32_EBL_CR_POWERON:
 		/* MTRR registers */
 	case 0xfe:
 	case 0x200 ... 0x2ff:

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Applied
#2 lore raw
Quoted 12 lines · Matthew Gregan

Hi,

Attempting to boot the default 'bsd' kernel of OpenBSD 4.1 i386 in a guest fails early in the kernel init inside p3_get_bus_clock while trying to read the IA32_EBL_CR_POWERON MSR. KVM logs an 'unhandled MSR' message and the guest kernel faults.

This patch is sufficient to allow OpenBSD to boot, after which it seems to run fine. I'm not sure if this is the correct solution for dealing with this particular MSR, but it works for me.

Applied, thanks.

Signature · 8 lines
error compiling committee.c: too many arguments to function


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