Re: [PATCH 07/10] powerpc/xive: add XIVE exploitation mode to CAS
From: Cédric Le Goater <clg@kaod.org>
Date: 2017-08-10 10:27:23
On 08/08/2017 10:56 AM, Cédric Le Goater wrote:
quoted hunk ↗ jump to hunk
On POWER9, the Client Architecture Support (CAS) negotiation process determines whether the guest operates in XIVE Legacy compatibility or in XIVE exploitation mode. Now that we have initial guest support for the XIVE interrupt controller, let's inform the hypervisor what we can do. Signed-off-by: Cédric Le Goater <clg@kaod.org> --- arch/powerpc/kernel/prom_init.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index 613f79f03877..25c14f543bd7 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c@@ -177,6 +177,7 @@ struct platform_support { bool hash_mmu; bool radix_mmu; bool radix_gtse; + bool xive; }; /* Platforms codes are now obsolete in the kernel. Now only used within this@@ -1054,6 +1055,12 @@ static void __init prom_parse_platform_support(u8 index, u8 val, support->radix_gtse = true; } break; + case OV5_INDX(OV5_XIVE_SUPPORT): /* XIVE Exploitation mode */ + if (val & OV5_FEAT(OV5_XIVE_SUPPORT)) {
This should be :
+ if (val & OV5_FEAT(OV5_XIVE_EXPLOIT)) {
I will fix it in the next version of the patchset.
C.
quoted hunk ↗ jump to hunk
+ prom_debug("XIVE - exploitation mode\n"); + support->xive = true; + } + break; } }@@ -1062,7 +1069,8 @@ static void __init prom_check_platform_support(void) struct platform_support supported = { .hash_mmu = false, .radix_mmu = false, - .radix_gtse = false + .radix_gtse = false, + .xive = false }; int prop_len = prom_getproplen(prom.chosen, "ibm,arch-vec-5-platform-support");@@ -1095,6 +1103,11 @@ static void __init prom_check_platform_support(void) /* We're probably on a legacy hypervisor */ prom_debug("Assuming legacy hash support\n"); } + + if (supported.xive) { + prom_debug("Asking for XIVE\n"); + ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT); + } } static void __init prom_send_capabilities(void)