From: Liu Yu-B13201 Date: Thu, 1 Dec 2011 20:22:53 +0000 (+0000) Subject: KVM: PPC: Avoid patching paravirt template code X-Git-Tag: upstream/snapshot3+hdmi~7836^2~83 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=befdc0a65afd17181392eff3d43c63407f266a9f;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git KVM: PPC: Avoid patching paravirt template code Currently we patch the whole code include paravirt template code. This isn't safe for scratch area and has impact to performance. Signed-off-by: Liu Yu Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c index 04d4b5a..62bdf23 100644 --- a/arch/powerpc/kernel/kvm.c +++ b/arch/powerpc/kernel/kvm.c @@ -665,6 +665,9 @@ static void kvm_check_ins(u32 *inst, u32 features) } } +extern u32 kvm_template_start[]; +extern u32 kvm_template_end[]; + static void kvm_use_magic_page(void) { u32 *p; @@ -692,8 +695,14 @@ static void kvm_use_magic_page(void) */ local_irq_disable(); - for (p = start; p < end; p++) + for (p = start; p < end; p++) { + /* Avoid patching the template code */ + if (p >= kvm_template_start && p < kvm_template_end) { + p = kvm_template_end - 1; + continue; + } kvm_check_ins(p, features); + } local_irq_enable(); diff --git a/arch/powerpc/kernel/kvm_emul.S b/arch/powerpc/kernel/kvm_emul.S index 801058d..e291cf3 100644 --- a/arch/powerpc/kernel/kvm_emul.S +++ b/arch/powerpc/kernel/kvm_emul.S @@ -66,6 +66,9 @@ kvm_hypercall_start: shared->critical == r1 and r2 is always != r1 */ \ STL64(r2, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0); +.global kvm_template_start +kvm_template_start: + .global kvm_emulate_mtmsrd kvm_emulate_mtmsrd: @@ -350,3 +353,6 @@ kvm_emulate_mtsrin_orig_ins_offs: .global kvm_emulate_mtsrin_len kvm_emulate_mtsrin_len: .long (kvm_emulate_mtsrin_end - kvm_emulate_mtsrin) / 4 + +.global kvm_template_end +kvm_template_end: