On Thu, Mar 19, 2020 at 11:04:21AM +0100, Jiri Slaby wrote:
> After commit f651c8b05542, virtio_gpu_create_object allocates too small
> space to fit everything in. It is because it allocates struct
> virtio_gpu_object, but should allocate a newly added struct
> virtio_gpu_object_shmem which has 2
After commit f651c8b05542, virtio_gpu_create_object allocates too small
space to fit everything in. It is because it allocates struct
virtio_gpu_object, but should allocate a newly added struct
virtio_gpu_object_shmem which has 2 more members.
So fix that by using correct type in
On Thu, 2020-03-19 at 10:14 +0100, Joerg Roedel wrote:
> From: Doug Covelli
>
> This change adds VMware specific handling for #VC faults caused by
> VMMCALL instructions.
>
> Signed-off-by: Doug Covelli
> Signed-off-by: Tom Lendacky
> [ jroe...@suse.de: - Adapt to different paravirt interface
On Wed, Mar 18, 2020 at 7:49 AM Gerd Hoffmann wrote:
>
> On Tue, Mar 17, 2020 at 05:49:41PM +0100, Daniel Vetter wrote:
> > On Fri, Mar 13, 2020 at 09:41:52AM +0100, Gerd Hoffmann wrote:
> > > Shutdown of firmware framebuffer has a bunch of problems. Because
> > > of this the framebuffer region
From: Joerg Roedel
Add handling for emulation the MOVS instruction on MMIO regions, as done
by the memcpy_toio() and memcpy_fromio() functions.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 78
1 file changed, 78 insertions(+)
diff --git
From: Joerg Roedel
Currently only CPUID caused #VC exceptions are supported from
user-space. Filter the others out early.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 24
1 file changed, 24 insertions(+)
diff --git a/arch/x86/kernel/sev-es.c
From: Joerg Roedel
Add a play_dead handler when running under SEV-ES. This is needed
because the hypervisor can't deliver an SIPI request to restart the AP.
Instead the kernel has to issue a VMGEXIT to halt the VCPU. When the
hypervisor would deliver and SIPI is wakes up the VCPU instead.
From: Joerg Roedel
Keep NMI state in SEV-ES code so the kernel can re-enable NMIs for the
vCPU when it reaches IRET.
Signed-off-by: Joerg Roedel
---
arch/x86/entry/entry_64.S | 48 +
arch/x86/include/asm/sev-es.h | 27 +++
From: Joerg Roedel
The APs are not ready to handle exceptions when verify_cpu() is called
in secondary_startup_64.
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/realmode.h | 1 +
arch/x86/kernel/head_64.S | 1 +
arch/x86/realmode/init.c| 6 ++
3 files changed, 8
From: Tom Lendacky
Add handler for VC exceptions caused by MMIO intercepts. These
intercepts come along as nested page faults on pages with reserved
bits set.
TODO:
- Add return values of helper functions
- Check permissions on page-table walks
- Check data segments
From: Tom Lendacky
Implement a handler for #VC exceptions caused by RDMSR/WRMSR
instructions.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 32
From: Tom Lendacky
Implement a handler for #VC exceptions caused by WBINVD instructions.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: Adapt to #VC handling framework ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 9 +
1 file changed, 9
From: Tom Lendacky
The runtime handler needs a GHCB per CPU. Set them up and map them
unencrypted.
Signed-off-by: Tom Lendacky
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/mem_encrypt.h | 2 ++
arch/x86/kernel/sev-es.c | 28 +++-
From: Tom Lendacky
Implement a handler for #VC exceptions caused by VMMCALL instructions.
This patch is only a starting point, VMMCALL emulation under SEV-ES
needs further hypervisor-specific changes to provide additional state.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: Adapt to #VC
From: Joerg Roedel
When a #VC exception is triggered by user-space the instruction decoder
needs to read the instruction bytes from user addresses. Enhance
vc_decode_insn() to safely fetch kernel and user instructions.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 31
From: Joerg Roedel
The feature bit will indicate whether the kernel runs as an SEV-ES
guest. This can be used to apply alternatives at boot for SEV-ES guests
and provides a way for user-space to detect whether it runs as an SEV-ES
guest.
Signed-off-by: Joerg Roedel
---
From: Tom Lendacky
Implement a handler for #VC exceptions caused by RDTSC instructions.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 20
1
From: Tom Lendacky
Implement a handler for #VC exceptions caused by MONITOR and MONITORX
instructions.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 19
From: Joerg Roedel
Handle #VC exceptions caused by #DB exceptions in the guest. Do not
forward them to the hypervisor and handle them with do_debug() instead.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 12
1 file changed, 12 insertions(+)
diff --git
From: Joerg Roedel
Re-use the handlers for CPUID and IOIO caused #VC exceptions in the
early boot handler.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es-shared.c | 7 +++
arch/x86/kernel/sev-es.c| 6 ++
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git
From: Tom Lendacky
Implement a handler for #VC exceptions caused by INVD instructions.
Since Linux should never use INVD, just mark it as unsupported.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg
From: Tom Lendacky
Implement a handler for #VC exceptions caused by MWAIT and MWAITX
instructions.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 12
From: Joerg Roedel
Handle #VC exceptions that happen while the GHCB is in use. This can
happen when an NMI happens in the #VC exception handler and the NMI
handler causes a #VC exception itself. Save the contents of the GHCB
when nesting is detected and restore it when the GHCB is no longer
From: Joerg Roedel
Extend the RDTSC handler to also handle RDTSCP events.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 15 +++
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index
From: Tom Lendacky
Implement the callbacks to copy the processor state required by KVM to
the GHCB.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: - Split out of a larger patch
- Adapt to different callback functions ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg
From: Tom Lendacky
Add code to handle #VC exceptions on DR7 register reads and writes.
This is needed early because show_regs() reads DR7 to print it out.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: - Adapt to #VC handling framework
- Support early usage ]
From: Tom Lendacky
Setup the AP jump table to point to the SEV-ES trampoline code so that
the APs can boot.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: - Adapted to different code base
- Moved AP table setup from SIPI sending path to
real-mode setup
From: Joerg Roedel
For SEV-ES this entry point will be used for restarting APs after they
have been offlined. Remove the '0' from the name to reflect that.
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/cpu.h | 2 +-
arch/x86/kernel/head_32.S | 4 ++--
arch/x86/kernel/head_64.S | 6
From: Joerg Roedel
The code at the trampoline entry point is executed in real-mode. In
real-mode #VC exceptions can't be handled, so anything that might cause
such an exception must be avoided.
In the standard trampoline entry code this is the WBINVD instruction and
the call to verify_cpu(),
From: Joerg Roedel
Send SIGBUS to the user-space process that caused the #VC exception
instead of killing the machine. Also ratelimit the error messages so
that user-space can't flood the kernel log.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 32
From: Joerg Roedel
Implement a handler for #VC exceptions caused by #AC exceptions. The #AC
exception is just forwarded to do_alignment_check() and not pushed down
to the hypervisor, as requested by the SEV-ES GHCB Standardization
Specification.
Signed-off-by: Joerg Roedel
---
From: Tom Lendacky
Implement a handler for #VC exceptions caused by RDPMC instructions.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/sev-es.c | 22 ++
1
From: Doug Covelli
This change adds VMware specific handling for #VC faults caused by
VMMCALL instructions.
Signed-off-by: Doug Covelli
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: - Adapt to different paravirt interface ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg Roedel
---
From: Joerg Roedel
The x86-64 ABI defines a red-zone on the stack:
The 128-byte area beyond the location pointed to by %rsp is
considered to be reserved and shall not be modified by signal or
interrupt handlers. 10 Therefore, functions may use this area for
temporary data that is not
From: Joerg Roedel
Add the first handler for #VC exceptions. At stage 1 there is no GHCB
yet becaue we might still be on the EFI page table and thus can't map
memory unencrypted.
The stage 1 handler is limited to the MSR based protocol to talk to
the hypervisor and can only support CPUID
From: Joerg Roedel
This function is needed to map the GHCB for SEV-ES guests. The GHCB is
used for communication with the hypervisor, so its content must not be
encrypted.
Signed-off-by: Joerg Roedel
---
arch/x86/boot/compressed/ident_map_64.c | 125
From: Joerg Roedel
Call set_sev_encryption_mask() while still on the stage 1 #VC-handler,
because the stage 2 handler needs our own page-tables to be set up, to
which calling set_sev_encryption_mask() is a prerequisite.
Signed-off-by: Joerg Roedel
---
arch/x86/boot/compressed/head_64.S |
From: Joerg Roedel
Add code needed to setup an IDT in the early pre-decompression
boot-code. The IDT is loaded first in startup_64, which is after
EfiExitBootServices() has been called, and later reloaded when the
kernel image has been relocated to the end of the decompression area.
This allows
From: Joerg Roedel
The code inserted by the stack protector does not work in the early
boot environment because it uses the GS segment, at least with memory
encryption enabled. Make sure the early code is compiled without this
feature enabled.
Signed-off-by: Joerg Roedel
---
From: Joerg Roedel
Move these two functions from kernel/idt.c to include/asm/desc.h:
* init_idt_data()
* idt_init_desc()
These functions are needed to setup IDT entries very early and need to
be called from head64.c. To be usable this early these functions need to
be compiled
From: Joerg Roedel
Setup sev-es.c and include the code from the
pre-decompression stage to also build it into the image of the running
kernel. Temporarily add __maybe_unused annotations to avoid build
warnings until the functions get used.
Signed-off-by: Joerg Roedel
---
From: Joerg Roedel
Install a page-fault handler to add an identity mapping to addresses
not yet mapped. Also do some checking whether the error code is sane.
This makes non SEV-ES machines use the exception handling
infrastructure in the pre-decompressions boot code too, making it less
likely
From: Joerg Roedel
Make sure segments are properly set up before setting up an IDT and
doing anything that might cause a #VC exception. This is later needed
for early exception handling.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/head_64.S | 52 +++
1
From: Joerg Roedel
Building a correct GHCB for the hypervisor requires setting valid bits
in the GHCB. Simplify that process by providing accessor functions to
set values and to update the valid bitmap.
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/svm.h | 61
From: Joerg Roedel
Move the definition of x86 trap vector numbers and the page-fault
error code bits to the new header file asm/trap_defs.h. This makes it
easier to include them into pre-decompression boot code. No functional
changes.
Signed-off-by: Joerg Roedel
---
From: Joerg Roedel
Factor out the code to fetch the instruction from user-space to a helper
function.
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/insn-eval.h | 2 ++
arch/x86/kernel/umip.c | 26 +-
arch/x86/lib/insn-eval.c | 38
From: Joerg Roedel
The inat-tables.c file has some arrays in it that contain pointers to
other arrays. These pointers need to be relocated when the kernel
image is moved to a different location.
The pre-decompression boot-code has no support for applying ELF
relocations, so initialize these
From: Joerg Roedel
The file contains only code related to identity mapped page-tables.
Rename the file and compile it always in.
Signed-off-by: Joerg Roedel
---
arch/x86/boot/compressed/Makefile| 2 +-
.../boot/compressed/{kaslr_64.c => ident_map_64.c} | 12
From: Joerg Roedel
The xgetbv() function is needed in pre-decompression boot code, but
asm/fpu/internal.h can't be included there directly. Doing so opens
the door to include-hell due to various include-magic in
boot/compressed/misc.h.
Avoid that by moving xgetbv()/xsetbv() to a separate header
From: Joerg Roedel
Load the IDT right after switching to virtual addresses in head_64.S
so that the kernel can handle #VC exceptions.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/head64.c | 15 +++
arch/x86/kernel/head_64.S | 17 +
2 files changed, 32
From: Joerg Roedel
Handling exceptions during boot requires a working GDT. The kernel GDT
is not yet ready for use, so install a temporary boot GDT.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/head_64.S | 32
1 file changed, 32 insertions(+)
diff --git
From: Joerg Roedel
Add the infrastructure to handle #VC 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.
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/segment.h | 2 +-
From: Joerg Roedel
Add two new paravirt callbacks to provide hypervisor specific processor
state in the GHCB and to copy state from the hypervisor back to the
processor.
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/x86_init.h | 16 +++-
arch/x86/kernel/sev-es.c| 12
On 2020/3/18 下午8:22, Jason Gunthorpe wrote:
On Wed, Mar 18, 2020 at 04:03:27PM +0800, Jason Wang wrote:
From: Zhu Lingshan
+
+static int ifcvf_vdpa_attach(struct ifcvf_adapter *adapter)
+{
+ int ret;
+
+ adapter->vdpa_dev = vdpa_alloc_device(adapter->dev, adapter->dev,
+
From: Joerg Roedel
With the page-fault handler in place the identity mapping can be built
on-demand. So remove the code which manually creates the mappings and
unexport/remove the functions used for it.
Signed-off-by: Joerg Roedel
---
arch/x86/boot/compressed/ident_map_64.c | 16
From: Tom Lendacky
Handle #VC exceptions caused by CPUID instructions. These happen in
early boot code when the KASLR code checks for RDTSC.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: Adapt to #VC handling framework ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg Roedel
---
From: Joerg Roedel
With SEV-ES, exception handling is needed very early, even before the
kernel has cleared the bss segment. In order to prevent clearing the
currently used IDT, move the IDT to the data segment.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/idt.c | 8 ++--
1 file
From: Joerg Roedel
Factor out the code used to decode an instruction with the correct
address and operand sizes to a helper function.
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/insn-eval.h | 2 ++
arch/x86/kernel/umip.c | 23 +---
arch/x86/lib/insn-eval.c
From: Joerg Roedel
When booted through startup_64 the kernel keeps running on the EFI
page-table until the KASLR code sets up its own page-table. Without
KASLR the pre-decompression boot code never switches off the EFI
page-table. Change that by unconditionally switching to our own
page-table
From: Tom Lendacky
Add the handler for #VC exceptions invoked at runtime.
Signed-off-by: Tom Lendacky
Signed-off-by: Joerg Roedel
---
arch/x86/entry/entry_64.S| 4 ++
arch/x86/include/asm/traps.h | 7
arch/x86/kernel/idt.c| 4 +-
arch/x86/kernel/sev-es.c | 77
Hi,
here is an updated version of the patch-set to enable Linux to run as a
guest in an SEV-ES enabled Hypervisor. The first version can be found
here:
https://lore.kernel.org/lkml/20200211135256.24617-1-j...@8bytes.org/
The first post also includes a more elaborate description of the
From: Joerg Roedel
Add the sev_es_active function for checking whether SEV-ES is enabled.
Also cache the value of MSR_AMD64_SEV at boot to speed up the feature
checking in the running code.
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/mem_encrypt.h | 3 +++
From: Joerg Roedel
In the CONFIG_X86_VERBOSE_BOOTUP=Y case the debug_puthex() macro just
turns into __puthex, which takes 'unsigned long' as parameter. But in
the CONFIG_X86_VERBOSE_BOOTUP=N case it is a function which takes
'unsigned char *', causing compile warnings when the function is used.
From: Joerg Roedel
Reload the GDT after switching to virtual addresses to make sure it will
not go away when the lower mappings are removed.
Signed-off-by: Joerg Roedel
---
arch/x86/kernel/head_64.S | 5 +
1 file changed, 5 insertions(+)
diff --git a/arch/x86/kernel/head_64.S
From: Tom Lendacky
Add CPU feature detection for Secure Encrypted Virtualization with
Encrypted State. This feature enhances SEV by also encrypting the
guest register state, making it in-accessible to the hypervisor.
Signed-off-by: Tom Lendacky
Signed-off-by: Joerg Roedel
---
From: Tom Lendacky
Add support for decoding and handling #VC exceptions for IOIO events.
Signed-off-by: Tom Lendacky
[ jroe...@suse.de: Adapted code to #VC handling framework ]
Co-developed-by: Joerg Roedel
Signed-off-by: Joerg Roedel
---
arch/x86/boot/compressed/sev-es.c | 32 +
From: Joerg Roedel
Setup an early handler for #VC exceptions. There is no GHCB mapped
yet, so just re-use the vc_no_ghcb_handler. It can only handle CPUID
exit-codes, but that should be enough to get the kernel through
verify_cpu() and __startup_64() until it runs on virtual addresses.
From: Joerg Roedel
Install an exception handler for #VC exception that uses a GHCB. Also
add the infrastructure for handling different exit-codes by decoding
the instruction that caused the exception and error handling.
Signed-off-by: Joerg Roedel
---
arch/x86/Kconfig
From: Joerg Roedel
Make sure there is a stack once the kernel runs from virual addresses.
At this stage any secondary CPU which boots will have lost its stack
because the kernel switched to a new page-table which does not map the
real-mode stack anymore.
This is also needed for handling early
From: Joerg Roedel
Add a function to the instruction decoder which returns the pt_regs
offset of the register specified in the reg field of the modrm byte.
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/insn-eval.h | 1 +
arch/x86/lib/insn-eval.c | 23 +++
2
From: Tom Lendacky
Extend the vmcb_safe_area with SEV-ES fields and add a new
'struct ghcb' which will be used for guest-hypervisor communication.
Signed-off-by: Tom Lendacky
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/svm.h | 42 ++
1 file
From: Joerg Roedel
The function can fail to create an identity mapping, check for that
and bail out if it happens.
Signed-off-by: Joerg Roedel
---
arch/x86/boot/compressed/ident_map_64.c | 7 +--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git
From: Joerg Roedel
Move the assembly coded dispatch between page-faults and all other
exceptions to C code to make it easier to maintain and extend.
Also change the return-type of early_make_pgtable() to bool and make it
static.
Signed-off-by: Joerg Roedel
---
arch/x86/include/asm/pgtable.h
From: Joerg Roedel
Changing the function to take start and end as parameters instead of
start and size simplifies the callers, which don't need to calculate
the size if they already have start and end.
Signed-off-by: Joerg Roedel
---
arch/x86/boot/compressed/ident_map_64.c | 15
Hi Jean-Philippe,
On Mon, Mar 16, 2020 at 04:52:23PM +0100, Jean-Philippe Brucker wrote:
> Should be:
>
> if (!dev_iommu_priv_set(dev))
Thanks a lot for your reviews! I made the changes to arm-smmu and the
qcom driver you requested and will post a new version later today.
Thanks,
On Fri, Mar 13, 2020 at 09:17:41PM +0100, Sam Ravnborg wrote:
> Thomas Zimmermann had made a nice patch-set that introduced
> drm_simple_encoder_init() which is already present in drm-misc-next.
>
> While looking at this it was suddenly obvious to me that
> this was functionalty that really
On Thu, Mar 19, 2020 at 04:14:37PM +0800, Jason Wang wrote:
>
> On 2020/3/18 下午8:22, Jason Gunthorpe wrote:
> > On Wed, Mar 18, 2020 at 04:03:27PM +0800, Jason Wang wrote:
> > > From: Zhu Lingshan
> > > +
> > > +static int ifcvf_vdpa_attach(struct ifcvf_adapter *adapter)
> > > +{
> > > + int
On Thu, Mar 19, 2020 at 2:14 AM Joerg Roedel wrote:
>
> From: Joerg Roedel
>
> Keep NMI state in SEV-ES code so the kernel can re-enable NMIs for the
> vCPU when it reaches IRET.
IIRC I suggested just re-enabling NMI in C from do_nmi(). What was
wrong with that approach?
> +#ifdef
On Thu, Mar 19, 2020 at 2:14 AM Joerg Roedel wrote:
>
> From: Tom Lendacky
>
> Add the handler for #VC exceptions invoked at runtime.
If I read this correctly, this does not use IST. If that's true, I
don't see how this can possibly work. There at least two nasty cases
that come to mind:
1.
On Thu, Mar 19, 2020 at 2:14 AM Joerg Roedel wrote:
>
> From: Joerg Roedel
>
> Handle #VC exceptions that happen while the GHCB is in use. This can
> happen when an NMI happens in the #VC exception handler and the NMI
> handler causes a #VC exception itself. Save the contents of the GHCB
> when
Hi Andy,
On Thu, Mar 19, 2020 at 08:35:59AM -0700, Andy Lutomirski wrote:
> On Thu, Mar 19, 2020 at 2:14 AM Joerg Roedel wrote:
> >
> > From: Joerg Roedel
> >
> > Keep NMI state in SEV-ES code so the kernel can re-enable NMIs for the
> > vCPU when it reaches IRET.
>
> IIRC I suggested just
On Thu, Mar 19, 2020 at 08:44:03AM -0700, Andy Lutomirski wrote:
> On Thu, Mar 19, 2020 at 2:14 AM Joerg Roedel wrote:
> >
> > From: Tom Lendacky
> >
> > Add the handler for #VC exceptions invoked at runtime.
>
> If I read this correctly, this does not use IST. If that's true, I
> don't see
On Thu, Mar 19, 2020 at 03:19:54PM +0100, Sam Ravnborg wrote:
> On Fri, Mar 13, 2020 at 09:17:41PM +0100, Sam Ravnborg wrote:
> > Thomas Zimmermann had made a nice patch-set that introduced
> > drm_simple_encoder_init() which is already present in drm-misc-next.
> >
> > While looking at this it
On Thu, Mar 19, 2020 at 08:46:36AM -0700, Andy Lutomirski wrote:
> This can't possibly end well. Maybe have a little percpu list of
> GHCBs and make sure there are enough for any possible nesting?
Yeah, it is not entirely robust yet. Without NMI nesting the number of
possible #VC nesting levels
On Thu, Mar 19, 2020 at 9:07 AM Joerg Roedel wrote:
>
> Hi Andy,
>
> On Thu, Mar 19, 2020 at 08:35:59AM -0700, Andy Lutomirski wrote:
> > On Thu, Mar 19, 2020 at 2:14 AM Joerg Roedel wrote:
> > >
> > > From: Joerg Roedel
> > >
> > > Keep NMI state in SEV-ES code so the kernel can re-enable NMIs
On Thu, Mar 19, 2020 at 9:24 AM Joerg Roedel wrote:
>
> On Thu, Mar 19, 2020 at 08:44:03AM -0700, Andy Lutomirski wrote:
> > On Thu, Mar 19, 2020 at 2:14 AM Joerg Roedel wrote:
> > >
> > > From: Tom Lendacky
> > >
> > > Add the handler for #VC exceptions invoked at runtime.
> >
> > If I read
On Thu, Mar 19, 2020 at 11:40:39AM -0700, Andy Lutomirski wrote:
> Nope. A nested NMI will reset the interrupted NMI's return frame to
> cause it to run again when it's done. I don't think this will have
> any real interaction with #VC. There's no longjmp() here.
Ahh, so I misunderstood that
On Thu, Mar 19, 2020 at 11:43:20AM -0700, Andy Lutomirski wrote:
> Or future generations could have enough hardware support for debugging
> that #DB doesn't need to be intercepted or can be re-injected
> correctly with the #DB vector.
Yeah, the problem is, the GHCB spec suggests the
On Thu, Mar 19, 2020 at 06:53:29PM +0200, Mika Penttilä wrote:
> > +SYM_CODE_START(sev_es_iret_user)
>
>
> What makes kernel jump here? Can't see this referenced from anywhere?
Sorry, it is just a left-over from a previous version of this patch
(which implemented the single-step-over-iret).
On Wed, 18 Mar 2020 17:14:05 +0100
Auger Eric wrote:
> Hi,
>
> On 3/18/20 1:00 PM, Robin Murphy wrote:
> > On 2020-03-18 11:40 am, Jean-Philippe Brucker wrote:
> >> We don't currently support IOMMUs with a page granule larger than the
> >> system page size. The IOVA allocator has a BUG_ON()
On Thu, Mar 19, 2020 at 12:26 PM Joerg Roedel wrote:
>
> On Thu, Mar 19, 2020 at 11:40:39AM -0700, Andy Lutomirski wrote:
>
> > Nope. A nested NMI will reset the interrupted NMI's return frame to
> > cause it to run again when it's done. I don't think this will have
> > any real interaction
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