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| author |  Sean Christopherson <seanjc@google.com>
| 2022-11-30 23:36:50 +0000 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com>
| 2023-01-24 10:05:22 -0800 |
| commit | a2b07fa7b93321c059af0c6d492cc9a4f1e390aa (patch) | |
| tree | ab7cb392c558816cf4f551952ff603b99723517d /arch/x86/kernel/smp.c | |
| parent | x86/reboot: Disable virtualization in an emergency if SVM is supported (diff) | |
| download | linux-a2b07fa7b93321c059af0c6d492cc9a4f1e390aa.tar.gz linux-a2b07fa7b93321c059af0c6d492cc9a4f1e390aa.tar.bz2 linux-a2b07fa7b93321c059af0c6d492cc9a4f1e390aa.zip | |
x86/reboot: Disable SVM, not just VMX, when stopping CPUs
Disable SVM and more importantly force GIF=1 when halting a CPU or
rebooting the machine. Similar to VMX, SVM allows software to block
INITs via CLGI, and thus can be problematic for a crash/reboot. The
window for failure is smaller with SVM as INIT is only blocked while
GIF=0, i.e. between CLGI and STGI, but the window does exist.
Fixes: fba4f472b33a ("x86/reboot: Turn off KVM when halting a CPU")
Cc: stable@vger.kernel.org
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20221130233650.1404148-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kernel/smp.c')
| -rw-r--r-- | arch/x86/kernel/smp.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c index 06db901fabe8..375b33ecafa2 100644 --- a/arch/x86/kernel/smp.c +++ b/arch/x86/kernel/smp.c @@ -32,7 +32,7 @@ #include <asm/mce.h> #include <asm/trace/irq_vectors.h> #include <asm/kexec.h> -#include <asm/virtext.h> +#include <asm/reboot.h> /* * Some notes on x86 processor bugs affecting SMP operation: @@ -122,7 +122,7 @@ static int smp_stop_nmi_callback(unsigned int val, struct pt_regs *regs) if (raw_smp_processor_id() == atomic_read(&stopping_cpu)) return NMI_HANDLED; - cpu_emergency_vmxoff(); + cpu_emergency_disable_virtualization(); stop_this_cpu(NULL); return NMI_HANDLED; @@ -134,7 +134,7 @@ static int smp_stop_nmi_callback(unsigned int val, struct pt_regs *regs) DEFINE_IDTENTRY_SYSVEC(sysvec_reboot) { ack_APIC_irq(); - cpu_emergency_vmxoff(); + cpu_emergency_disable_virtualization(); stop_this_cpu(NULL); } |