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KVM: PPC: Not optimizing MSR_CE and MSR_ME with paravirt.

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If there is pending critical or machine check interrupt then guest
would like to capture it when guest enable MSR.CE and MSR_ME respectively.
Also as mostly MSR_CE and MSR_ME are updated with rfi/rfci/rfmii
which anyway traps so removing the the paravirt optimization for MSR.CE
and MSR.ME.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Bharat Bhushan 2012-05-20 23:21:53 +00:00 • committed by Alexander Graf
parent 21bd000abf
commit d35b1075af
2 changed files with 1 additions and 3 deletions
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2
Documentation/virtual/kvm/ppc-pv.txt
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@ -109,8 +109,6 @@ The following bits are safe to be set inside the guest:
MSR_EE MSR_EE
MSR_RI MSR_RI
MSR_CR
MSR_ME
If any other bit changes in the MSR, please still use mtmsr(d). If any other bit changes in the MSR, please still use mtmsr(d).

2
arch/powerpc/kernel/kvm_emul.S
View file

@ -122,7 +122,7 @@ kvm_emulate_mtmsrd_len:
.long (kvm_emulate_mtmsrd_end - kvm_emulate_mtmsrd) / 4 .long (kvm_emulate_mtmsrd_end - kvm_emulate_mtmsrd) / 4
#define MSR_SAFE_BITS (MSR_EE | MSR_CE | MSR_ME | MSR_RI) #define MSR_SAFE_BITS (MSR_EE | MSR_RI)
#define MSR_CRITICAL_BITS ~MSR_SAFE_BITS #define MSR_CRITICAL_BITS ~MSR_SAFE_BITS
.global kvm_emulate_mtmsr .global kvm_emulate_mtmsr