Message ID | CAGZKiBr0G-boxFCmt-mL9Qu56Ubn3tkSndCHiNz79tB094L7xw@mail.gmail.com |
---|---|
State | New |
Headers | show |
On 2011-09-07 06:21, Bharata B Rao wrote: > Hi, > > Sometime back I posted a patch for fixing x86 CPU topology ( > http://lists.gnu.org/archive/html/qemu-devel/2011-08/msg02022.html). > Here is the next version of the fix which addresses all but one > comment received during that post. > > - Fixed code style issues > - Ensured that the fix doesn't break TCG mode > - I am not sure what is the problem with i486 as I haven't been able > to boot an i486 VM successfully, hence haven't attempted to fix this. -smp 2 -cpu i486 boots fine here (granted, I don't have some i486 SMP kernel at hand). > > I have tested following scenarios and found the fix to be working fine. > > KVM: (with --enable-kvm) > -smp sockets=1,cores=4,threads=2 > -smp sockets=4,cores=4,threads=2 > -cpu core2duo sockets=1,cores=4,threads=2 > -cpu core2duo sockets=2,cores=4,threads=2 > > TCG: (without --enable-kvm) > -cpu core2duo sockets=1,cores=4,threads=2 > -cpu core2duo sockets=2,cores=4,threads=2 > > Here is the updated patch which now applies against qemu.git. > > ******************** > Fix apic id enumeration > > apic id returned to guest kernel in ebx for cpuid(function=1) depends on > CPUX86State->cpuid_apic_id which gets populated after the cpuid information > is cached in the host kernel. > > Fix this by setting cpuid_apic_id before cpuid information is passed to > the host kernel. This is done by moving the setting of cpuid_apic_id > to cpu_x86_init() where it will work for both KVM as well as TCG modes. > > Signed-off-by: Bharata B Rao <bharata.rao@gmail.com> > --- > hw/pc.c | 1 - > target-i386/helper.c | 5 +++++ > 2 files changed, 5 insertions(+), 1 deletion(-) > > Index: qemu/hw/pc.c > =================================================================== > --- qemu.orig/hw/pc.c > +++ qemu/hw/pc.c > @@ -933,7 +933,6 @@ static CPUState *pc_new_cpu(const char * > exit(1); > } > if ((env->cpuid_features & CPUID_APIC) || smp_cpus > 1) { > - env->cpuid_apic_id = env->cpu_index; > env->apic_state = apic_init(env, env->cpuid_apic_id); > } > qemu_register_reset(pc_cpu_reset, env); > Index: qemu/target-i386/helper.c > =================================================================== > --- qemu.orig/target-i386/helper.c > +++ qemu/target-i386/helper.c > @@ -1256,6 +1256,11 @@ CPUX86State *cpu_x86_init(const char *cp > cpu_x86_close(env); > return NULL; > } > + > + if (env->cpuid_features & CPUID_APIC) { || smp_cpus > 1 Should be obvious when looking at the hunk you took this from. > + env->cpuid_apic_id = env->cpu_index; > + } > + > mce_init(env); > > qemu_init_vcpu(env); > ************************* > > Regards, > Bharata. > -- > http://bharata.sulekha.com/blog/posts.htm, http://raobharata.wordpress.com/ > > Jan
On Wed, Sep 7, 2011 at 1:37 PM, Jan Kiszka <jan.kiszka@siemens.com> wrote: > On 2011-09-07 06:21, Bharata B Rao wrote: >> - I am not sure what is the problem with i486 as I haven't been able >> to boot an i486 VM successfully, hence haven't attempted to fix this. > > -smp 2 -cpu i486 boots fine here (granted, I don't have some i486 SMP > kernel at hand). I am getting "Unable to find x86 CPU definition" error with -cpu i486. Need to investigate more. >> + >> + if (env->cpuid_features & CPUID_APIC) { > > || smp_cpus > 1 > > Should be obvious when looking at the hunk you took this from. Yes, but I thought no harm in initializing it for uni processor case too, no ? Regards, Bharata.
On 2011-09-07 10:19, Bharata B Rao wrote: > On Wed, Sep 7, 2011 at 1:37 PM, Jan Kiszka <jan.kiszka@siemens.com> wrote: >> On 2011-09-07 06:21, Bharata B Rao wrote: >>> - I am not sure what is the problem with i486 as I haven't been able >>> to boot an i486 VM successfully, hence haven't attempted to fix this. >> >> -smp 2 -cpu i486 boots fine here (granted, I don't have some i486 SMP >> kernel at hand). > > I am getting "Unable to find x86 CPU definition" error with -cpu i486. > Need to investigate more. Err, sorry: -cpu 486 > >>> + >>> + if (env->cpuid_features & CPUID_APIC) { >> >> || smp_cpus > 1 >> >> Should be obvious when looking at the hunk you took this from. > > Yes, but I thought no harm in initializing it for uni processor case too, no ? 486 CPUs do not have the CPUID_APIC feature set as they do not include a local APIC. But those SMP systems have external APICs. Jan
On 09/06/2011 11:21 PM, Bharata B Rao wrote: > Hi, > > Sometime back I posted a patch for fixing x86 CPU topology ( > http://lists.gnu.org/archive/html/qemu-devel/2011-08/msg02022.html). > Here is the next version of the fix which addresses all but one > comment received during that post. > > - Fixed code style issues > - Ensured that the fix doesn't break TCG mode > - I am not sure what is the problem with i486 as I haven't been able > to boot an i486 VM successfully, hence haven't attempted to fix this. > > I have tested following scenarios and found the fix to be working fine. > > KVM: (with --enable-kvm) > -smp sockets=1,cores=4,threads=2 > -smp sockets=4,cores=4,threads=2 > -cpu core2duo sockets=1,cores=4,threads=2 > -cpu core2duo sockets=2,cores=4,threads=2 > > TCG: (without --enable-kvm) > -cpu core2duo sockets=1,cores=4,threads=2 > -cpu core2duo sockets=2,cores=4,threads=2 > > Here is the updated patch which now applies against qemu.git. > > ******************** > Fix apic id enumeration > > apic id returned to guest kernel in ebx for cpuid(function=1) depends on > CPUX86State->cpuid_apic_id which gets populated after the cpuid information > is cached in the host kernel. > > Fix this by setting cpuid_apic_id before cpuid information is passed to > the host kernel. This is done by moving the setting of cpuid_apic_id > to cpu_x86_init() where it will work for both KVM as well as TCG modes. > > Signed-off-by: Bharata B Rao<bharata.rao@gmail.com> Please post patches as top-level threads with [PATCH] in the subject. Please use git diff or better yet, git-send-email. Regards, Anthony Liguori > --- > hw/pc.c | 1 - > target-i386/helper.c | 5 +++++ > 2 files changed, 5 insertions(+), 1 deletion(-) > > Index: qemu/hw/pc.c > =================================================================== > --- qemu.orig/hw/pc.c > +++ qemu/hw/pc.c > @@ -933,7 +933,6 @@ static CPUState *pc_new_cpu(const char * > exit(1); > } > if ((env->cpuid_features& CPUID_APIC) || smp_cpus> 1) { > - env->cpuid_apic_id = env->cpu_index; > env->apic_state = apic_init(env, env->cpuid_apic_id); > } > qemu_register_reset(pc_cpu_reset, env); > Index: qemu/target-i386/helper.c > =================================================================== > --- qemu.orig/target-i386/helper.c > +++ qemu/target-i386/helper.c > @@ -1256,6 +1256,11 @@ CPUX86State *cpu_x86_init(const char *cp > cpu_x86_close(env); > return NULL; > } > + > + if (env->cpuid_features& CPUID_APIC) { > + env->cpuid_apic_id = env->cpu_index; > + } > + > mce_init(env); > > qemu_init_vcpu(env); > ************************* > > Regards, > Bharata. > -- > http://bharata.sulekha.com/blog/posts.htm, http://raobharata.wordpress.com/ >
On Wed, Sep 7, 2011 at 6:29 PM, Anthony Liguori <anthony@codemonkey.ws> wrote: > On 09/06/2011 11:21 PM, Bharata B Rao wrote: >> >> Hi, >> > Please post patches as top-level threads with [PATCH] in the subject. I posted a new thread and hence it has appeared as a top-level thread. This was a fix and hence used [FIX], but if this mailing list expects [PATCH], then will use it from next time. > Please > use git diff or better yet, git-send-email. This was a small patch and hence used quilt. If you insist, I can use git for the next post :) Regards, Bharata.
On 09/07/2011 08:24 AM, Bharata B Rao wrote: > On Wed, Sep 7, 2011 at 6:29 PM, Anthony Liguori<anthony@codemonkey.ws> wrote: >> On 09/06/2011 11:21 PM, Bharata B Rao wrote: >>> >>> Hi, >>> >> Please post patches as top-level threads with [PATCH] in the subject. > > I posted a new thread and hence it has appeared as a top-level thread. > > This was a fix and hence used [FIX], but if this mailing list expects > [PATCH], then will use it from next time. > >> Please >> use git diff or better yet, git-send-email. > > This was a small patch and hence used quilt. If you insist, I can use > git for the next post :) It's not strictly required, but git includes extra information in the patch it generates (base revision) which git-am can use to merge the patch via a 3way merge instead of patch fuzz. That makes life a bit easier when you're applying a lot of patches. Regards, Anthony Liguori > > Regards, > Bharata. >
Index: qemu/hw/pc.c =================================================================== --- qemu.orig/hw/pc.c +++ qemu/hw/pc.c @@ -933,7 +933,6 @@ static CPUState *pc_new_cpu(const char * exit(1); } if ((env->cpuid_features & CPUID_APIC) || smp_cpus > 1) { - env->cpuid_apic_id = env->cpu_index; env->apic_state = apic_init(env, env->cpuid_apic_id); } qemu_register_reset(pc_cpu_reset, env); Index: qemu/target-i386/helper.c =================================================================== --- qemu.orig/target-i386/helper.c +++ qemu/target-i386/helper.c @@ -1256,6 +1256,11 @@ CPUX86State *cpu_x86_init(const char *cp cpu_x86_close(env); return NULL; } + + if (env->cpuid_features & CPUID_APIC) { + env->cpuid_apic_id = env->cpu_index; + } + mce_init(env); qemu_init_vcpu(env);
Hi, Sometime back I posted a patch for fixing x86 CPU topology ( http://lists.gnu.org/archive/html/qemu-devel/2011-08/msg02022.html). Here is the next version of the fix which addresses all but one comment received during that post. - Fixed code style issues - Ensured that the fix doesn't break TCG mode - I am not sure what is the problem with i486 as I haven't been able to boot an i486 VM successfully, hence haven't attempted to fix this. I have tested following scenarios and found the fix to be working fine. KVM: (with --enable-kvm) -smp sockets=1,cores=4,threads=2 -smp sockets=4,cores=4,threads=2 -cpu core2duo sockets=1,cores=4,threads=2 -cpu core2duo sockets=2,cores=4,threads=2 TCG: (without --enable-kvm) -cpu core2duo sockets=1,cores=4,threads=2 -cpu core2duo sockets=2,cores=4,threads=2 Here is the updated patch which now applies against qemu.git. ******************** Fix apic id enumeration apic id returned to guest kernel in ebx for cpuid(function=1) depends on CPUX86State->cpuid_apic_id which gets populated after the cpuid information is cached in the host kernel. Fix this by setting cpuid_apic_id before cpuid information is passed to the host kernel. This is done by moving the setting of cpuid_apic_id to cpu_x86_init() where it will work for both KVM as well as TCG modes. Signed-off-by: Bharata B Rao <bharata.rao@gmail.com> --- hw/pc.c | 1 - target-i386/helper.c | 5 +++++ 2 files changed, 5 insertions(+), 1 deletion(-) ************************* Regards, Bharata. -- http://bharata.sulekha.com/blog/posts.htm, http://raobharata.wordpress.com/