search for: realmode

...y, doesn't want to explain to us why is this even needed... :) /me reads the code /me reads the GHCB spec aha, it gets it from the HV. And it can be set by the guest too... So how about expanding that commit message as to why this is done, why needed, etc? Thx. > diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c > index 262f83cad355..1c5cbfd102d5 100644 > --- a/arch/x86/realmode/init.c > +++ b/arch/x86/realmode/init.c > @@ -9,6 +9,7 @@ > #include <asm/realmode.h> > #include <asm/tlbflush.h> > #include <asm/crash.h> > +#include &...

From: Joerg Roedel <jroedel at suse.de> The APs are not ready to handle exceptions when verify_cpu() is called in secondary_startup_64. Signed-off-by: Joerg Roedel <jroedel at suse.de> --- arch/x86/include/asm/realmode.h | 1 + arch/x86/kernel/head_64.S | 1 + arch/x86/realmode/init.c | 6 ++++++ 3 files changed, 8 insertions(+) diff --git a/arch/x86/include/asm/realmode.h b/arch/x86/include/asm/realmode.h index 6590394af309..5c97807c38a4 100644 --- a/arch/x86/include/asm/realmode.h +++ b/arch/x86/i...

From: Joerg Roedel <jroedel at suse.de> The APs are not ready to handle exceptions when verify_cpu() is called in secondary_startup_64. Signed-off-by: Joerg Roedel <jroedel at suse.de> --- arch/x86/include/asm/realmode.h | 1 + arch/x86/kernel/head_64.S | 12 ++++++++++++ arch/x86/realmode/init.c | 6 ++++++ 3 files changed, 19 insertions(+) diff --git a/arch/x86/include/asm/realmode.h b/arch/x86/include/asm/realmode.h index 6590394af309..5c97807c38a4 100644 --- a/arch/x86/include/asm/realmode.h +...

>>> - D28094 (Implemented support for R_386_PC8/R_386_8 relocations) >> Do you remember where it was used ? > >setup.elf: > ld.lld -m elf_i386 -T arch/x86/boot/setup.ld arch/x86/boot/a20.o arch/x86/boot/bioscall.o arch/x86/boot/cmdline.o arch/x86/boot/copy.o arch/x86/boot/cpu.o >arch/x86/boot/cpuflags.o arch/x86/boot/cpucheck.o arch/x86/boot/early_serial_console.o

Hello, I am trying to compile RHEL-6 kernel srpm on Fedora 14 and run into the following problem. From what I read -Werror flag causes warnings to be treated as errors - but I don't see that flag on in the following. Any ideas? gcc -Wp,-MD,arch/x86/kernel/acpi/realmode/.wakemain.o.d -nostdinc -isystem /usr/lib/gcc/i686-redhat-linux/4.5.1/include -nostdinc -isystem /usr/lib/gcc/i686-redhat-linux/4.5.1/include -Iinclude -I/home/sclark/rpmbuild/BUILD/kernel-2.6.32/arch/x86/include -include include/linux/autoconf.h -D__KERNEL__ -Iinclude -I/home/sclark/rpmbuild/BUI...

...sparse warnings ] Co-developed-by: Joerg Roedel <jroedel at suse.de> Signed-off-by: Joerg Roedel <jroedel at suse.de> --- arch/x86/include/asm/sev-es.h | 6 +++ arch/x86/include/uapi/asm/svm.h | 3 ++ arch/x86/kernel/sev-es.c | 66 +++++++++++++++++++++++++++++++++ arch/x86/realmode/init.c | 6 +++ 4 files changed, 81 insertions(+) diff --git a/arch/x86/include/asm/sev-es.h b/arch/x86/include/asm/sev-es.h index ca0e12cb089c..c89b6e2e6439 100644 --- a/arch/x86/include/asm/sev-es.h +++ b/arch/x86/include/asm/sev-es.h @@ -78,17 +78,23 @@ static inline u64 lower_bits(u64...

...; Signed-off-by: Joerg Roedel <jroedel at suse.de> Link: https://lore.kernel.org/r/20200724160336.5435-69-joro at 8bytes.org --- arch/x86/include/asm/sev-es.h | 5 +++ arch/x86/include/uapi/asm/svm.h | 3 ++ arch/x86/kernel/sev-es.c | 68 +++++++++++++++++++++++++++++++++ arch/x86/realmode/init.c | 18 ++++++++- 4 files changed, 92 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/sev-es.h b/arch/x86/include/asm/sev-es.h index 2dd19932a60d..6ca38dc378e0 100644 --- a/arch/x86/include/asm/sev-es.h +++ b/arch/x86/include/asm/sev-es.h @@ -73,6 +73,9 @@ static inline...

...artup_64. Eek, no. MSR_IA32_MISC_ENABLE_XD_DISABLE needs to be cleared very early during CPU startup; this can't just be skipped. Also, is UNWIND_HINT_EMPTY needed for the new target? -Kees > > Signed-off-by: Joerg Roedel <jroedel at suse.de> > --- > arch/x86/include/asm/realmode.h | 1 + > arch/x86/kernel/head_64.S | 1 + > arch/x86/realmode/init.c | 6 ++++++ > 3 files changed, 8 insertions(+) > > diff --git a/arch/x86/include/asm/realmode.h b/arch/x86/include/asm/realmode.h > index 6590394af309..5c97807c38a4 100644 > --- a/arch/x86/incl...

...artup_64. Eek, no. MSR_IA32_MISC_ENABLE_XD_DISABLE needs to be cleared very early during CPU startup; this can't just be skipped. Also, is UNWIND_HINT_EMPTY needed for the new target? -Kees > > Signed-off-by: Joerg Roedel <jroedel at suse.de> > --- > arch/x86/include/asm/realmode.h | 1 + > arch/x86/kernel/head_64.S | 1 + > arch/x86/realmode/init.c | 6 ++++++ > 3 files changed, 8 insertions(+) > > diff --git a/arch/x86/include/asm/realmode.h b/arch/x86/include/asm/realmode.h > index 6590394af309..5c97807c38a4 100644 > --- a/arch/x86/incl...

I was trying to install Ubuntu 7.10 on an HVM domain, when when the install kept hanging at a particular point. xm dmesg shows the following : (XEN) realmode.c:132:d28 Failed to emulate insn. (XEN) realmode.c:174:d28 Real-mode emulation failed @ 0000:00007f34: 0f 2c 06 08 6b 04 (XEN) domain_crash called from realmode.c:175 (XEN) Domain 28 (vcpu#0) crashed on cpu#0: (XEN) ----[ Xen-3.4-unstable x86_32p debug=n Not tainted ]---- (XEN) CPU: 0 (XEN) E...

...el/sev-es.c > index 28fe95ecd508..09a45ccd6c1d 100644 > --- a/arch/x86/kernel/sev-es.c > +++ b/arch/x86/kernel/sev-es.c > @@ -21,6 +21,8 @@ > #include <linux/mm.h> > > #include <asm/cpu_entry_area.h> > +#include <asm/stacktrace.h> > +#include <asm/realmode.h> > #include <asm/sev-es.h> > #include <asm/insn-eval.h> > #include <asm/fpu/internal.h> > @@ -219,6 +221,9 @@ static __always_inline void sev_es_put_ghcb(struct ghcb_state *state) > } > } > > +/* Needed in vc_early_vc_forward_exception */ vc_e...

Hello, I read in the announce of Xen 3.2.0 released that it has "preliminary support for a wider range of bootloaders in fully virtualised (HVM) guests, using full emulation of x86 ''real mode''" . I''d like to know what is the level of the emulation of x86 ''real mode''? I ask that because I tried to install OpenSuse 10.3 (I used the iso file

...re and Windows 2000 boot failure.       In the early code, we use vmx_vmexit_handler() -> vmx_io_instruction() function to emulate I/O instructions. But now, we use vmx_vmexit_handler() -> handle_mmio -> hvm_emulate_one() -> x86_emulate() to emulate I/O instructions. Also nowadays, the realmode emulation code walks through the path: vmx_realmode() -> realmode_emulate_one() -> hvm_emulate_one() -> x86_emulate().       The I/O handle code in x86_emulate() checks the cpl and iopl value, and if cpl > iopl, it will generate a GP fault. This causes Linux guest installation failure...

...ttle concerned about the "correctness" of the FSTSW emulation and the use of inline assembly directly using the corresponding ops for emulation. Wrt FSTSW, it is really two ops FNSTSW immediately preceeded by an FWAIT. I''ve left FWAIT defined, but a no-op because after looking at realmode.c it seems in the emulation, exceptions are always processed if a call to x86_emulate returns an exception, so there should be no way for there to be "pending" exceptions for FWAIT to wait for. I may have missed something, though, hence the RFC. Secondly, about the inline assembly - i sa...

All, in the light of erratum #573 I''m wondering if we need to tweak or conditionally suppress fsincos emulation. The question is whether there is any possibility for getting the emulator to hit this instruction on AMD (as no real mode emulation ought to be taking place there), i.e. whether there are places where emulation gets continued eagerly in anticipation of the need for emulation

...exceptions when the kernel runs on virtual addresses and has a GHCB mapped. This handler will be used until the runtime #VC handler takes over. Since the handler runs very early, disable instrumentation for sev-es.c. Signed-off-by: Joerg Roedel <jroedel at suse.de> --- arch/x86/include/asm/realmode.h | 3 + arch/x86/include/asm/segment.h | 2 +- arch/x86/include/asm/sev-es.h | 2 + arch/x86/kernel/Makefile | 2 + arch/x86/kernel/head64.c | 11 +++ arch/x86/kernel/head_64.S | 34 ++++++++++ arch/x86/kernel/sev-es-shared.c | 14 ++-- arch/x86/kernel/sev-es.c...

...scripts/mod/elfconfig.h HOSTCC scripts/mod/file2alias.o HOSTCC scripts/mod/modpost.o HOSTCC scripts/mod/sumversion.o HOSTLD scripts/mod/modpost CALL /home/onkar/xen/xen-4.0.0/linux-2.6-pvops.git/scripts/checksyscalls.sh CHK include/linux/compile.h LDS arch/x86/kernel/acpi/realmode/wakeup.lds LD arch/x86/kernel/acpi/realmode/wakeup.elf OBJCOPY arch/x86/kernel/acpi/realmode/wakeup.bin AS arch/x86/kernel/acpi/wakeup_rm.o LD arch/x86/kernel/acpi/built-in.o LDS arch/x86/kernel/vmlinux.lds LD arch/x86/kernel/built-in.o LDS arch/x86/vdso/vd...

...scripts/mod/elfconfig.h HOSTCC scripts/mod/file2alias.o HOSTCC scripts/mod/modpost.o HOSTCC scripts/mod/sumversion.o HOSTLD scripts/mod/modpost CALL /home/onkar/xen/xen-4.0.0/linux-2.6-pvops.git/scripts/checksyscalls.sh CHK include/linux/compile.h LDS arch/x86/kernel/acpi/realmode/wakeup.lds LD arch/x86/kernel/acpi/realmode/wakeup.elf OBJCOPY arch/x86/kernel/acpi/realmode/wakeup.bin AS arch/x86/kernel/acpi/wakeup_rm.o LD arch/x86/kernel/acpi/built-in.o LDS arch/x86/kernel/vmlinux.lds LD arch/x86/kernel/built-in.o LDS arch/x86/vdso/vd...

...head_64.S @@ -174,6 +174,32 @@ SYM_CODE_START(secondary_startup_64) */ lgdt early_gdt_descr(%rip) + /* set up data segments */ + xorl %eax,%eax + movl %eax,%ds + movl %eax,%ss + movl %eax,%es + + /* + * We don't really need to load %fs or %gs, but load them anyway + * to kill any stale realmode selectors. This allows execution + * under VT hardware. + */ + movl %eax,%fs + movl %eax,%gs + + /* Set up %gs. + * + * The base of %gs always points to fixed_percpu_data. If the + * stack protector canary is enabled, it is located at %gs:40. + * Note that, on SMP, the boot cpu uses init dat...

Matt Fleming wrote: > On Wed, 03 Jul, at 03:02:19PM, Andreas Heinlein wrote: >> I had to add at least one boot entry to get a working config, so I >> ended up with this isolinux.cfg: >> >> label live >> menu label ^Try Ubuntu without installing >> kernel /casper/vmlinuz >> append file=/cdrom/preseed/ubuntu.seed boot=casper >>