OS usually expects BIOS to set certain bits in MSR_IA32_FEATURE_CONTROL for some features (e.g. VMX and LMCE). QEMU provides a fw_cfg file "etc/msr_feature_control" to advise bits that should be set in MSR_IA32_FEATURE_CONTROL. If this file exists, SeaBIOS will set the advised bits in that MSR.
Signed-off-by: Haozhong Zhang haozhong.zhang@intel.com --- QEMU patch added fw_cfg file etc/msr_feature_control can be found at [1]. Note I mistakenly used u32 as the type of file content in that patch, which should be u64 and will be fixed.
[1] https://lists.nongnu.org/archive/html/qemu-devel/2016-06/msg04389.html --- Makefile | 2 +- src/fw/msr_feature_control.c | 16 ++++++++++++++++ src/fw/paravirt.c | 3 +++ src/fw/smp.c | 6 +++++- src/util.h | 5 +++++ 5 files changed, 30 insertions(+), 2 deletions(-) create mode 100644 src/fw/msr_feature_control.c
diff --git a/Makefile b/Makefile index 4930b3a..f38a075 100644 --- a/Makefile +++ b/Makefile @@ -43,7 +43,7 @@ SRC32FLAT=$(SRCBOTH) post.c e820map.c malloc.c romfile.c x86.c optionroms.c \ fw/paravirt.c fw/shadow.c fw/pciinit.c fw/smm.c fw/smp.c fw/mtrr.c fw/xen.c \ fw/acpi.c fw/mptable.c fw/pirtable.c fw/smbios.c fw/romfile_loader.c \ hw/virtio-ring.c hw/virtio-pci.c hw/virtio-blk.c hw/virtio-scsi.c \ - hw/tpm_drivers.c + hw/tpm_drivers.c fw/msr_feature_control.c SRC32SEG=string.c output.c pcibios.c apm.c stacks.c hw/pci.c hw/serialio.c DIRS=src src/hw src/fw vgasrc
diff --git a/src/fw/msr_feature_control.c b/src/fw/msr_feature_control.c new file mode 100644 index 0000000..35d4ab8 --- /dev/null +++ b/src/fw/msr_feature_control.c @@ -0,0 +1,16 @@ +#include "util.h" // msr_feature_control_setup +#include "x86.h" // wrmsr +#include "romfile.h" // romfile_find + +u64 feature_control_bits; + +void msr_feature_control_setup(void) +{ + struct romfile_s *f = romfile_find("etc/msr_feature_control"); + if (!f) + return; + + f->copy(f, &feature_control_bits, sizeof(feature_control_bits)); + if (feature_control_bits) + wrmsr(MSR_IA32_FEATURE_CONTROL, feature_control_bits); +} diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c index 8ed4380..640ee4c 100644 --- a/src/fw/paravirt.c +++ b/src/fw/paravirt.c @@ -153,6 +153,9 @@ qemu_platform_setup(void) mtrr_setup(); smp_setup();
+ // Initialize MSR_IA32_FEATURE_CONTROL + msr_feature_control_setup(); + // Create bios tables pirtable_setup(); mptable_setup(); diff --git a/src/fw/smp.c b/src/fw/smp.c index 579acdb..8b57bf4 100644 --- a/src/fw/smp.c +++ b/src/fw/smp.c @@ -10,7 +10,7 @@ #include "output.h" // dprintf #include "romfile.h" // romfile_loadint #include "stacks.h" // yield -#include "util.h" // smp_setup +#include "util.h" // smp_setup, msr_feature_control_setup #include "x86.h" // wrmsr
#define APIC_ICR_LOW ((u8*)BUILD_APIC_ADDR + 0x300) @@ -63,6 +63,10 @@ handle_smp(void) for (i=0; i<smp_mtrr_count; i++) wrmsr(smp_mtrr[i].index, smp_mtrr[i].val);
+ // MSR_IA32_FEATURE_CONTROL setup + if (feature_control_bits) + wrmsr(MSR_IA32_FEATURE_CONTROL, feature_control_bits); + // Set bit on FoundAPICIDs FoundAPICIDs[apic_id/32] |= (1 << (apic_id % 32));
diff --git a/src/util.h b/src/util.h index 7b41207..fc8e59d 100644 --- a/src/util.h +++ b/src/util.h @@ -103,6 +103,11 @@ int csm_bootprio_pci(struct pci_device *pci); // fw/mptable.c void mptable_setup(void);
+// fw/msr_feature_control.c +#define MSR_IA32_FEATURE_CONTROL 0x0000003a +extern u64 feature_control_bits; +void msr_feature_control_setup(void); + // fw/mtrr.c void mtrr_setup(void);
On 16/06/2016 13:49, Haozhong Zhang wrote:
diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c index 8ed4380..640ee4c 100644 --- a/src/fw/paravirt.c +++ b/src/fw/paravirt.c @@ -153,6 +153,9 @@ qemu_platform_setup(void) mtrr_setup(); smp_setup();
- // Initialize MSR_IA32_FEATURE_CONTROL
- msr_feature_control_setup();
- // Create bios tables pirtable_setup(); mptable_setup();
This must run before smp_setup(), because it is smp_setup() that calls handle_smp() on the APs.
diff --git a/src/fw/msr_feature_control.c b/src/fw/msr_feature_control.c new file mode 100644 index 0000000..35d4ab8 --- /dev/null +++ b/src/fw/msr_feature_control.c @@ -0,0 +1,16 @@ +#include "util.h" // msr_feature_control_setup +#include "x86.h" // wrmsr +#include "romfile.h" // romfile_find
+u64 feature_control_bits;
+void msr_feature_control_setup(void) +{
- struct romfile_s *f = romfile_find("etc/msr_feature_control");
- if (!f)
return;- f->copy(f, &feature_control_bits, sizeof(feature_control_bits));
- if (feature_control_bits)
wrmsr(MSR_IA32_FEATURE_CONTROL, feature_control_bits);
You can use wrmsr_smp and avoid the change below to handle_smp(). It also removes the need for the feature_control_bits global variable.
Thanks,
Paolo
+} diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c index 8ed4380..640ee4c 100644 --- a/src/fw/paravirt.c +++ b/src/fw/paravirt.c @@ -153,6 +153,9 @@ qemu_platform_setup(void) mtrr_setup(); smp_setup();
- // Initialize MSR_IA32_FEATURE_CONTROL
- msr_feature_control_setup();
- // Create bios tables pirtable_setup(); mptable_setup();
diff --git a/src/fw/smp.c b/src/fw/smp.c index 579acdb..8b57bf4 100644 --- a/src/fw/smp.c +++ b/src/fw/smp.c @@ -10,7 +10,7 @@ #include "output.h" // dprintf #include "romfile.h" // romfile_loadint #include "stacks.h" // yield -#include "util.h" // smp_setup +#include "util.h" // smp_setup, msr_feature_control_setup #include "x86.h" // wrmsr
#define APIC_ICR_LOW ((u8*)BUILD_APIC_ADDR + 0x300) @@ -63,6 +63,10 @@ handle_smp(void) for (i=0; i<smp_mtrr_count; i++) wrmsr(smp_mtrr[i].index, smp_mtrr[i].val);
- // MSR_IA32_FEATURE_CONTROL setup
- if (feature_control_bits)
wrmsr(MSR_IA32_FEATURE_CONTROL, feature_control_bits);- // Set bit on FoundAPICIDs FoundAPICIDs[apic_id/32] |= (1 << (apic_id % 32));
diff --git a/src/util.h b/src/util.h index 7b41207..fc8e59d 100644 --- a/src/util.h +++ b/src/util.h @@ -103,6 +103,11 @@ int csm_bootprio_pci(struct pci_device *pci); // fw/mptable.c void mptable_setup(void);
+// fw/msr_feature_control.c +#define MSR_IA32_FEATURE_CONTROL 0x0000003a +extern u64 feature_control_bits; +void msr_feature_control_setup(void);
// fw/mtrr.c void mtrr_setup(void);
On 06/16/16 14:03, Paolo Bonzini wrote:
On 16/06/2016 13:49, Haozhong Zhang wrote:
diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c index 8ed4380..640ee4c 100644 --- a/src/fw/paravirt.c +++ b/src/fw/paravirt.c @@ -153,6 +153,9 @@ qemu_platform_setup(void) mtrr_setup(); smp_setup();
- // Initialize MSR_IA32_FEATURE_CONTROL
- msr_feature_control_setup();
- // Create bios tables pirtable_setup(); mptable_setup();
This must run before smp_setup(), because it is smp_setup() that calls handle_smp() on the APs.
I'll move it before smp_setup().
diff --git a/src/fw/msr_feature_control.c b/src/fw/msr_feature_control.c new file mode 100644 index 0000000..35d4ab8 --- /dev/null +++ b/src/fw/msr_feature_control.c @@ -0,0 +1,16 @@ +#include "util.h" // msr_feature_control_setup +#include "x86.h" // wrmsr +#include "romfile.h" // romfile_find
+u64 feature_control_bits;
+void msr_feature_control_setup(void) +{
- struct romfile_s *f = romfile_find("etc/msr_feature_control");
- if (!f)
return;- f->copy(f, &feature_control_bits, sizeof(feature_control_bits));
- if (feature_control_bits)
wrmsr(MSR_IA32_FEATURE_CONTROL, feature_control_bits);You can use wrmsr_smp and avoid the change below to handle_smp(). It also removes the need for the feature_control_bits global variable.
Good idea. I think I should also rename smp_mtrr and smp_mtrr_count to something like smp_msr and smp_msr_count, because they will not be used only for MTRR.
Thanks, Haozhong
diff --git a/src/fw/msr_feature_control.c b/src/fw/msr_feature_control.c new file mode 100644 index 0000000..35d4ab8 --- /dev/null +++ b/src/fw/msr_feature_control.c @@ -0,0 +1,16 @@ +#include "util.h" // msr_feature_control_setup +#include "x86.h" // wrmsr +#include "romfile.h" // romfile_find
+u64 feature_control_bits;
+void msr_feature_control_setup(void) +{
- struct romfile_s *f = romfile_find("etc/msr_feature_control");
- if (!f)
return;- f->copy(f, &feature_control_bits, sizeof(feature_control_bits));
- if (feature_control_bits)
wrmsr(MSR_IA32_FEATURE_CONTROL, feature_control_bits);You can use wrmsr_smp and avoid the change below to handle_smp(). It also removes the need for the feature_control_bits global variable.
Good idea. I think I should also rename smp_mtrr and smp_mtrr_count to something like smp_msr and smp_msr_count, because they will not be used only for MTRR.
Yes, pleaase do!
Thanks,
Paolo
-
Haozhong Zhang -
Paolo Bonzini