From patchwork Tue May 15 07:34:42 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [1/2] KVM: PPC: Not optimizing MSR_CE and MSR_DE with paravirt. From: Bharat Bhushan X-Patchwork-Id: 159240 Message-Id: <1337067282-26549-1-git-send-email-bharat.bhushan@freescale.com> To: , Cc: Bhushan Bharat-R65777 , Bharat Bhushan Date: Tue, 15 May 2012 13:04:42 +0530 From: Bhushan Bharat-R65777 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 --- Documentation/virtual/kvm/ppc-pv.txt | 2 -- arch/powerpc/kernel/kvm_emul.S | 2 +- 2 files changed, 1 insertions(+), 3 deletions(-) diff --git a/Documentation/virtual/kvm/ppc-pv.txt b/Documentation/virtual/kvm/ppc-pv.txt index 6e7c370..4911cf9 100644 --- a/Documentation/virtual/kvm/ppc-pv.txt +++ b/Documentation/virtual/kvm/ppc-pv.txt @@ -109,8 +109,6 @@ The following bits are safe to be set inside the guest: MSR_EE MSR_RI - MSR_CR - MSR_ME If any other bit changes in the MSR, please still use mtmsr(d). diff --git a/arch/powerpc/kernel/kvm_emul.S b/arch/powerpc/kernel/kvm_emul.S index e291cf3..3dfa890 100644 --- a/arch/powerpc/kernel/kvm_emul.S +++ b/arch/powerpc/kernel/kvm_emul.S @@ -132,7 +132,7 @@ kvm_emulate_mtmsrd_len: .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 .global kvm_emulate_mtmsr