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authorAndre Przywara <andre.przywara@arm.com>2018-07-06 11:11:50 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2019-02-20 00:05:22 +0300
commitee7930490a8f84570e96268f5736e99570b58307 (patch)
treea517617fdf0cf02dcea998a8347b5dc93a5f14f6 /drivers/clocksource
parent49a57857aeea06ca831043acbb0fa5e0f50602fd (diff)
downloadlinux-ee7930490a8f84570e96268f5736e99570b58307.tar.xz
clocksource/arm_arch_timer: Store physical timer IRQ number for KVM on VHE
A host running in VHE mode gets the EL2 physical timer as its time source (accessed using the EL1 sysreg accessors, which get re-directed to the EL2 sysregs by VHE). The EL1 physical timer remains unused by the host kernel, allowing us to pass that on directly to a KVM guest and saves us from emulating this timer for the guest on VHE systems. Store the EL1 Physical Timer's IRQ number in struct arch_timer_kvm_info on VHE systems to allow KVM to use it. Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/arm_arch_timer.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 9a7d4dc00b6e..b9243e2328b4 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -1206,6 +1206,13 @@ static enum arch_timer_ppi_nr __init arch_timer_select_ppi(void)
return ARCH_TIMER_PHYS_SECURE_PPI;
}
+static void __init arch_timer_populate_kvm_info(void)
+{
+ arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
+ if (is_kernel_in_hyp_mode())
+ arch_timer_kvm_info.physical_irq = arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI];
+}
+
static int __init arch_timer_of_init(struct device_node *np)
{
int i, ret;
@@ -1220,7 +1227,7 @@ static int __init arch_timer_of_init(struct device_node *np)
for (i = ARCH_TIMER_PHYS_SECURE_PPI; i < ARCH_TIMER_MAX_TIMER_PPI; i++)
arch_timer_ppi[i] = irq_of_parse_and_map(np, i);
- arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
+ arch_timer_populate_kvm_info();
rate = arch_timer_get_cntfrq();
arch_timer_of_configure_rate(rate, np);
@@ -1550,7 +1557,7 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table)
arch_timer_ppi[ARCH_TIMER_HYP_PPI] =
acpi_gtdt_map_ppi(ARCH_TIMER_HYP_PPI);
- arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
+ arch_timer_populate_kvm_info();
/*
* When probing via ACPI, we have no mechanism to override the sysreg