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| author | Liu Yu-B13201 <Yu.Liu@freescale.com> | 2011-12-01 20:22:53 +0000 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-03-05 14:52:34 +0200 |
| commit | befdc0a65afd17181392eff3d43c63407f266a9f (patch) | |
| tree | 1adf9e1cbef1f5d555334de5ce2a9b71ae8dd490 | |
| parent | 570135243a33174a5d74641de693b6c0233d1181 (diff) | |
| download | linux-stable-befdc0a65afd17181392eff3d43c63407f266a9f.tar.gz linux-stable-befdc0a65afd17181392eff3d43c63407f266a9f.tar.bz2 linux-stable-befdc0a65afd17181392eff3d43c63407f266a9f.zip | |
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 <yu.liu@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
| -rw-r--r-- | arch/powerpc/kernel/kvm.c | 11 | ||||
| -rw-r--r-- | arch/powerpc/kernel/kvm_emul.S | 6 |
2 files changed, 16 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c index 04d4b5aa6dca..62bdf2389669 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 801058dd74db..e291cf3cf954 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: |