Messages in this thread | | | Subject | Re: [PATCH V2] x86/sev-es: Fix SEV-ES #VC handler for string port IO | From | Tom Lendacky <> | Date | Mon, 11 Jan 2021 12:29:08 -0600 |
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On 1/10/21 1:11 AM, Hyunwook (Wooky) Baek wrote: > Don't assume dest/source buffers are userspace addresses when manually > copying data for string I/O or MOVS MMIO, as {get,put}_user() will fail > if handed a kernel address and ultimately lead to a kernel panic. > > Signed-off-by: Hyunwook (Wooky) Baek <baekhw@google.com> > Acked-by: David Rientjes <rientjes@google.com> > --- > > This patch is tested by invoking INSB/OUTSB instructions in kernel space in a > SEV-ES-enabled VM. Without the patch, the kernel crashed with the following > message: > "SEV-ES: Unsupported exception in #VC instruction emulation - can't continue" > With the patch, the instructions successfully read/wrote the string from/to > the I/O port.
Shouldn't this have a Fixes: tag?
Thanks, Tom
> > arch/x86/kernel/sev-es.c | 12 ++++++++++++ > 1 file changed, 12 insertions(+) >
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