From a413f474a0ff29404bf1af5c024215476ed6ca01 Mon Sep 17 00:00:00 2001 From: Ian Munsie Date: Mon, 3 Dec 2012 18:36:13 +0000 Subject: powerpc: Disable relocation on exceptions whenever PR KVM is active For PR KVM we allow userspace to map 0xc000000000000000. Because transitioning from userspace to the guest kernel may use the relocated exception vectors we have to disable relocation on exceptions whenever PR KVM is active as we cannot trust that address. This issue does not apply to HV KVM, since changing from a guest to the hypervisor will never use the relocated exception vectors. Currently the hypervisor interface only allows us to toggle relocation on exceptions on a partition wide scope, so we need to globally disable relocation on exceptions when the first PR KVM instance is started and only re-enable them when all PR KVM instances have been destroyed. It's a bit heavy handed, but until the hypervisor gives us a lightweight way to toggle relocation on exceptions on a single thread it's only real option. Signed-off-by: Ian Munsie Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/platforms/pseries/setup.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'arch/powerpc/platforms/pseries/setup.c') diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index ca55882465d..1890730354b 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -375,7 +375,7 @@ static void pSeries_idle(void) * to ever be a problem in practice we can move this into a kernel thread to * finish off the process later in boot. */ -static int __init pSeries_enable_reloc_on_exc(void) +long pSeries_enable_reloc_on_exc(void) { long rc; unsigned int delay, total_delay = 0; @@ -397,9 +397,9 @@ static int __init pSeries_enable_reloc_on_exc(void) mdelay(delay); } } +EXPORT_SYMBOL(pSeries_enable_reloc_on_exc); -#ifdef CONFIG_KEXEC -static long pSeries_disable_reloc_on_exc(void) +long pSeries_disable_reloc_on_exc(void) { long rc; @@ -410,7 +410,9 @@ static long pSeries_disable_reloc_on_exc(void) mdelay(get_longbusy_msecs(rc)); } } +EXPORT_SYMBOL(pSeries_disable_reloc_on_exc); +#ifdef CONFIG_KEXEC static void pSeries_machine_kexec(struct kimage *image) { long rc; -- cgit v1.2.3 From bf99de36e48678c61adb697496e0364c610bbbfc Mon Sep 17 00:00:00 2001 From: Michael Neuling Date: Thu, 20 Dec 2012 14:06:45 +0000 Subject: powerpc: Add the DAWR support to the set_break() This adds DAWR supoprt to the set_break(). It does both bare metal and PAPR versions of setting the DAWR. There is still some work we can do to make full use of the watchpoint but that will come later. Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/platforms/pseries/setup.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'arch/powerpc/platforms/pseries/setup.c') diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index 1890730354b..b1f60d162bb 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -65,6 +65,7 @@ #include #include #include +#include #include "plpar_wrappers.h" #include "pseries.h" @@ -500,6 +501,14 @@ static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx) return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx); } +static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx) +{ + /* PAPR says we can't set HYP */ + dawrx &= ~DAWRX_HYP; + + return plapr_set_watchpoint0(dawr, dawrx); +} + #define CMO_CHARACTERISTICS_TOKEN 44 #define CMO_MAXLENGTH 1026 @@ -606,6 +615,9 @@ static void __init pSeries_init_early(void) else if (firmware_has_feature(FW_FEATURE_DABR)) ppc_md.set_dabr = pseries_set_dabr; + if (firmware_has_feature(FW_FEATURE_SET_MODE)) + ppc_md.set_dawr = pseries_set_dawr; + pSeries_cmo_feature_init(); iommu_init_early_pSeries(); -- cgit v1.2.3