From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Mackerras Subject: [PATCH 7/8] KVM: PPC: Book3S HV: Fix decrementer timeouts with non-zero TB offset Date: Tue, 25 Mar 2014 10:47:07 +1100 Message-ID: <1395704828-20180-8-git-send-email-paulus@samba.org> References: <1395704828-20180-1-git-send-email-paulus@samba.org> Cc: Alexander Graf , Paul Mackerras To: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org Return-path: In-Reply-To: <1395704828-20180-1-git-send-email-paulus@samba.org> Sender: kvm-ppc-owner@vger.kernel.org List-Id: kvm.vger.kernel.org Commit c7699822bc21 ("KVM: PPC: Book3S HV: Make physical thread 0 do the MMU switching") reordered the guest entry/exit code so that most of the guest register save/restore code happened in guest MMU context. A side effect of that is that the timebase still contains the guest timebase value at the point where we compute and use vcpu->arch.dec_expires, and therefore that is now a guest timebase value rather than a host timebase value. That in turn means that the timeouts computed in kvmppc_set_timer() are wrong if the timebase offset for the guest is non-zero. The consequence of that is things such as "sleep 1" in a guest after migration may sleep for much longer than they should. This fixes the problem by converting between guest and host timebase values as necessary, by adding or subtracting the timebase offset. This also fixes an incorrect comment. Signed-off-by: Paul Mackerras --- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 6c8dca7..0e6d9e5 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -833,6 +833,10 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) * Set the decrementer to the guest decrementer. */ ld r8,VCPU_DEC_EXPIRES(r4) + /* r8 is a host timebase value here, convert to guest TB */ + ld r5,HSTATE_KVM_VCORE(r13) + ld r6,VCORE_TB_OFFSET(r5) + add r8,r8,r6 mftb r7 subf r3,r7,r8 mtspr SPRN_DEC,r3 @@ -1196,6 +1200,10 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_201) mftb r6 extsw r5,r5 add r5,r5,r6 + /* r5 is a guest timebase value here, convert to host TB */ + ld r3,HSTATE_KVM_VCORE(r13) + ld r4,VCORE_TB_OFFSET(r3) + subf r5,r4,r5 std r5,VCPU_DEC_EXPIRES(r9) BEGIN_FTR_SECTION @@ -1471,7 +1479,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) ld r8,VCORE_TB_OFFSET(r5) cmpdi r8,0 beq 17f - mftb r6 /* current host timebase */ + mftb r6 /* current guest timebase */ subf r8,r8,r6 mtspr SPRN_TBU40,r8 /* update upper 40 bits */ mftb r7 /* check if lower 24 bits overflowed */ -- 1.9.rc1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Mackerras Date: Mon, 24 Mar 2014 23:47:07 +0000 Subject: [PATCH 7/8] KVM: PPC: Book3S HV: Fix decrementer timeouts with non-zero TB offset Message-Id: <1395704828-20180-8-git-send-email-paulus@samba.org> List-Id: References: <1395704828-20180-1-git-send-email-paulus@samba.org> In-Reply-To: <1395704828-20180-1-git-send-email-paulus@samba.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org Cc: Alexander Graf , Paul Mackerras Commit c7699822bc21 ("KVM: PPC: Book3S HV: Make physical thread 0 do the MMU switching") reordered the guest entry/exit code so that most of the guest register save/restore code happened in guest MMU context. A side effect of that is that the timebase still contains the guest timebase value at the point where we compute and use vcpu->arch.dec_expires, and therefore that is now a guest timebase value rather than a host timebase value. That in turn means that the timeouts computed in kvmppc_set_timer() are wrong if the timebase offset for the guest is non-zero. The consequence of that is things such as "sleep 1" in a guest after migration may sleep for much longer than they should. This fixes the problem by converting between guest and host timebase values as necessary, by adding or subtracting the timebase offset. This also fixes an incorrect comment. Signed-off-by: Paul Mackerras --- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 6c8dca7..0e6d9e5 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -833,6 +833,10 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) * Set the decrementer to the guest decrementer. */ ld r8,VCPU_DEC_EXPIRES(r4) + /* r8 is a host timebase value here, convert to guest TB */ + ld r5,HSTATE_KVM_VCORE(r13) + ld r6,VCORE_TB_OFFSET(r5) + add r8,r8,r6 mftb r7 subf r3,r7,r8 mtspr SPRN_DEC,r3 @@ -1196,6 +1200,10 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_201) mftb r6 extsw r5,r5 add r5,r5,r6 + /* r5 is a guest timebase value here, convert to host TB */ + ld r3,HSTATE_KVM_VCORE(r13) + ld r4,VCORE_TB_OFFSET(r3) + subf r5,r4,r5 std r5,VCPU_DEC_EXPIRES(r9) BEGIN_FTR_SECTION @@ -1471,7 +1479,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) ld r8,VCORE_TB_OFFSET(r5) cmpdi r8,0 beq 17f - mftb r6 /* current host timebase */ + mftb r6 /* current guest timebase */ subf r8,r8,r6 mtspr SPRN_TBU40,r8 /* update upper 40 bits */ mftb r7 /* check if lower 24 bits overflowed */ -- 1.9.rc1