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Detect KVM hypervisor and set /hypervisor properties accordingly

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The ePAPR spec requires us to have a /hypervisor node that tells the guest OS
which hypervisor it's running on and which hypercall to use to call into it.

So let's fetch all that information from Qemu's fw_cfg interface and put it
into place, making everyone happy.

Signed-off-by: Alexander Graf <agraf@suse.de>

git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@853 f158a5a8-5612-0410-a976-696ce0be7e32
This commit is contained in:
Alexander Graf
2010-08-17 15:42:10 +00:00
parent 0d2c29f1ef
commit 736d3849ea
3 changed files with 62 additions and 0 deletions
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54
arch/ppc/qemu/init.c
View File

@@ -518,6 +518,58 @@ go( void )
call_elf( 0, 0, addr);
}
static void kvm_of_init(void)
{
char hypercall[4 * 4];
uint32_t *hc32;
/* Don't expose /hypervisor when not in KVM */
if (!fw_cfg_read_i32(FW_CFG_PPC_IS_KVM))
return;
push_str("/hypervisor");
fword("find-device");
/* compatible */
push_str("linux,kvm");
fword("encode-string");
push_str("epapr,hypervisor-0.2");
fword("encode-string");
fword("encode+");
push_str("compatible");
fword("property");
/* Tell the guest about the hypercall instructions */
fw_cfg_read(FW_CFG_PPC_KVM_HC, hypercall, 4 * 4);
hc32 = (uint32_t*)hypercall;
PUSH(hc32[0]);
fword("encode-int");
PUSH(hc32[1]);
fword("encode-int");
fword("encode+");
PUSH(hc32[2]);
fword("encode-int");
fword("encode+");
PUSH(hc32[3]);
fword("encode-int");
fword("encode+");
push_str("hcall-instructions");
fword("property");
/* ePAPR requires us to provide a unique guest id */
PUSH(fw_cfg_read_i32(FW_CFG_PPC_KVM_PID));
fword("encode-int");
push_str("guest-id");
fword("property");
/* ePAPR requires us to provide a guest name */
push_str("KVM guest");
fword("encode-string");
push_str("guest-name");
fword("property");
}
void
arch_of_init( void )
{
@@ -714,6 +766,8 @@ arch_of_init( void )
stdout_path = "screen";
}
kvm_of_init();
/* Setup nvram variables */
push_str("/options");
fword("find-device");

5
arch/ppc/qemu/tree.fs
View File

@@ -39,6 +39,11 @@ new-device
: close ;
finish-device
new-device
" hypervisor" device-name
" hypervisor" device-type
finish-device
\ -------------------------------------------------------------
\ /packages
\ -------------------------------------------------------------

3
include/arch/common/fw_cfg.h
View File

@@ -41,6 +41,9 @@
#define FW_CFG_PPC_DEPTH (FW_CFG_ARCH_LOCAL + 0x02)
#define FW_CFG_PPC_TBFREQ (FW_CFG_ARCH_LOCAL + 0x03)
#define FW_CFG_PPC_CPUFREQ (FW_CFG_ARCH_LOCAL + 0x04)
#define FW_CFG_PPC_IS_KVM (FW_CFG_ARCH_LOCAL + 0x05)
#define FW_CFG_PPC_KVM_HC (FW_CFG_ARCH_LOCAL + 0x06)
#define FW_CFG_PPC_KVM_PID (FW_CFG_ARCH_LOCAL + 0x07)
#define FW_CFG_INVALID 0xffff