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author | James Morris <james.morris@microsoft.com> | 2018-03-23 08:26:16 +1100 |
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committer | James Morris <james.morris@microsoft.com> | 2018-03-23 08:26:16 +1100 |
commit | 5893ed18a26d1f56b97c0290b0cbbc2d49d6de28 (patch) | |
tree | 97aa931519fca28a0a12fad7485347198f8267cc /arch/x86/xen/suspend.c | |
parent | 7bd698b3c04e61ee9e03d4c2a55003f75df14dca (diff) | |
parent | c698ca5278934c0ae32297a8725ced2e27585d7f (diff) | |
download | talos-obmc-linux-5893ed18a26d1f56b97c0290b0cbbc2d49d6de28.tar.gz talos-obmc-linux-5893ed18a26d1f56b97c0290b0cbbc2d49d6de28.zip |
Merge tag 'v4.16-rc6' into next-general
Merge to Linux 4.16-rc6 at the request of Jarkko, for his TPM updates.
Diffstat (limited to 'arch/x86/xen/suspend.c')
-rw-r--r-- | arch/x86/xen/suspend.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c index d9f96cc5d743..1d83152c761b 100644 --- a/arch/x86/xen/suspend.c +++ b/arch/x86/xen/suspend.c @@ -1,12 +1,15 @@ // SPDX-License-Identifier: GPL-2.0 #include <linux/types.h> #include <linux/tick.h> +#include <linux/percpu-defs.h> #include <xen/xen.h> #include <xen/interface/xen.h> #include <xen/grant_table.h> #include <xen/events.h> +#include <asm/cpufeatures.h> +#include <asm/msr-index.h> #include <asm/xen/hypercall.h> #include <asm/xen/page.h> #include <asm/fixmap.h> @@ -15,6 +18,8 @@ #include "mmu.h" #include "pmu.h" +static DEFINE_PER_CPU(u64, spec_ctrl); + void xen_arch_pre_suspend(void) { xen_save_time_memory_area(); @@ -35,6 +40,9 @@ void xen_arch_post_suspend(int cancelled) static void xen_vcpu_notify_restore(void *data) { + if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL)) + wrmsrl(MSR_IA32_SPEC_CTRL, this_cpu_read(spec_ctrl)); + /* Boot processor notified via generic timekeeping_resume() */ if (smp_processor_id() == 0) return; @@ -44,7 +52,15 @@ static void xen_vcpu_notify_restore(void *data) static void xen_vcpu_notify_suspend(void *data) { + u64 tmp; + tick_suspend_local(); + + if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL)) { + rdmsrl(MSR_IA32_SPEC_CTRL, tmp); + this_cpu_write(spec_ctrl, tmp); + wrmsrl(MSR_IA32_SPEC_CTRL, 0); + } } void xen_arch_resume(void) |