On Wed, Jul 15, 2020 at 12:49:23PM -0700, Kees Cook wrote:
> Aaah. I see. Thanks for the details there. So ... can you add a bunch
> more comments about why/when the new entry path is being used? I really
> don't want to accidentally discover some unrelated refactoring down
> the road (in months,
On Wed, Jul 15, 2020 at 05:48:56PM +0200, Joerg Roedel wrote:
> It is actually the CPUID instructions that cause #VC exceptions. The
> MSRs that are accessed on AMD processors are not intercepted in the
> hypervisors this code has been tested on, so these will not cause #VC
> exceptions.
Aaah. I
Hi Kees,
as a general note: With SEV-ES the guest kernel will get #VC exceptions
for events that, without SEV-ES, would just cause a #VMEXIT to the
hypervisor.
On Wed, Jul 15, 2020 at 08:26:14AM -0700, Kees Cook wrote:
> On Wed, Jul 15, 2020 at 11:26:38AM +0200, Joerg Roedel wrote:
> > That MSR
On Wed, Jul 15, 2020 at 11:26:38AM +0200, Joerg Roedel wrote:
> Hi Kees,
>
> thanks for your reviews!
>
> On Tue, Jul 14, 2020 at 06:40:30PM -0700, Kees Cook wrote:
> > Eek, no. MSR_IA32_MISC_ENABLE_XD_DISABLE needs to be cleared very early
> > during CPU startup; this can't just be skipped.
>
Hi Kees,
thanks for your reviews!
On Tue, Jul 14, 2020 at 06:40:30PM -0700, Kees Cook wrote:
> Eek, no. MSR_IA32_MISC_ENABLE_XD_DISABLE needs to be cleared very early
> during CPU startup; this can't just be skipped.
That MSR is Intel-only, right? The boot-path installed here is only used
for
On Tue, Jul 14, 2020 at 02:09:12PM +0200, Joerg Roedel wrote:
> From: Joerg Roedel
>
> The APs are not ready to handle exceptions when verify_cpu() is called
> in secondary_startup_64.
Eek, no. MSR_IA32_MISC_ENABLE_XD_DISABLE needs to be cleared very early
during CPU startup; this can't just be
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
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