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Commit 6cb2b08f authored by Jiri Kosina's avatar Jiri Kosina Committed by Ingo Molnar
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x86/pti: Don't report XenPV as vulnerable 



Xen PV domain kernel is not by design affected by meltdown as it's
enforcing split CR3 itself. Let's not report such systems as "Vulnerable"
in sysfs (we're also already forcing PTI to off in X86_HYPER_XEN_PV cases);
the security of the system ultimately depends on presence of mitigation in
the Hypervisor, which can't be easily detected from DomU; let's report
that.

Reported-and-tested-by: default avatarMike Latimer <mlatimer@suse.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarJuergen Gross <jgross@suse.com>
Cc: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/nycvar.YFH.7.76.1806180959080.6203@cbobk.fhfr.pm


[ Merge the user-visible string into a single line. ]
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 9ffc59d5

arch/x86/kernel/cpu/bugs.c

+4 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <asm/pgtable.h>

#include <asm/set_memory.h>

#include <asm/intel-family.h>

#include <asm/hypervisor.h>



static void __init spectre_v2_select_mitigation(void);

static void __init ssb_select_mitigation(void);
@@ -664,6 +665,9 @@ static ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr 
		if (boot_cpu_has(X86_FEATURE_PTI))

			return sprintf(buf, "Mitigation: PTI\n");



		if (hypervisor_is_type(X86_HYPER_XEN_PV))

			return sprintf(buf, "Unknown (XEN PV detected, hypervisor mitigation required)\n");



		break;



	case X86_BUG_SPECTRE_V1: