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| author | Avi Kivity <avi@redhat.com> | 2012-06-13 16:29:39 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-07-09 14:19:04 +0300 |
| commit | e919464b53ea29aed46ff10f7d6416268678bdb9 (patch) | |
| tree | cc9b3ec3043a6edbd6a6ae8adf2bed272ffba5fa | |
| parent | a14e579f224ba929fe2f1d9bbbff688ae67e2ec4 (diff) | |
| download | linux-e919464b53ea29aed46ff10f7d6416268678bdb9.tar.gz linux-e919464b53ea29aed46ff10f7d6416268678bdb9.tar.bz2 linux-e919464b53ea29aed46ff10f7d6416268678bdb9.zip | |
KVM: x86 emulator: make read_segment_descriptor() return the address
Some operations want to modify the descriptor later on, so save the
address for future use.
Signed-off-by: Avi Kivity <avi@redhat.com>
| -rw-r--r-- | arch/x86/kvm/emulate.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 7b575adaf1fd..99e3df2bf880 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1296,7 +1296,8 @@ static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt, /* allowed just for 8 bytes segments */ static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt, - u16 selector, struct desc_struct *desc) + u16 selector, struct desc_struct *desc, + ulong *desc_addr_p) { struct desc_ptr dt; u16 index = selector >> 3; @@ -1307,7 +1308,7 @@ static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt, if (dt.size < index * 8 + 7) return emulate_gp(ctxt, selector & 0xfffc); - addr = dt.address + index * 8; + *desc_addr_p = addr = dt.address + index * 8; return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc, &ctxt->exception); } @@ -1339,6 +1340,7 @@ static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, unsigned err_vec = GP_VECTOR; u32 err_code = 0; bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */ + ulong desc_addr; int ret; memset(&seg_desc, 0, sizeof seg_desc); @@ -1374,7 +1376,7 @@ static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, if (null_selector) /* for NULL selector skip all following checks */ goto load; - ret = read_segment_descriptor(ctxt, selector, &seg_desc); + ret = read_segment_descriptor(ctxt, selector, &seg_desc, &desc_addr); if (ret != X86EMUL_CONTINUE) return ret; @@ -2614,13 +2616,14 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, ulong old_tss_base = ops->get_cached_segment_base(ctxt, VCPU_SREG_TR); u32 desc_limit; + ulong desc_addr; /* FIXME: old_tss_base == ~0 ? */ - ret = read_segment_descriptor(ctxt, tss_selector, &next_tss_desc); + ret = read_segment_descriptor(ctxt, tss_selector, &next_tss_desc, &desc_addr); if (ret != X86EMUL_CONTINUE) return ret; - ret = read_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc); + ret = read_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc, &desc_addr); if (ret != X86EMUL_CONTINUE) return ret; |